Download or read book Component Effects on the Structural Mechanical and Ion Transport Properties of Gel Polymer Electrolyte for Lithium Ion Batteries A Multiscale Molecular Simulation Study written by and published by . This book was released on 2021 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ion Transport and Structure in Polymer Electrolytes with Applications in Lithium Batteries written by Mahati Chintapalli and published by . This book was released on 2016 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: When mixed with lithium salts, polymers that contain more than one chemical group, such as block copolymers and endgroup-functionalized polymers, are promising electrolyte materials for next-generation lithium batteries. One chemical group can provide good ion solvation and transport properties, while the other chemical group can provide secondary properties that improve the performance characteristics of the battery. Secondary properties of interest include non-flammability for safer lithium ion batteries and high mechanical modulus for dendrite resistance in high energy density lithium metal batteries. Block copolymers and other materials with multiple chemical groups tend to exhibit nanoscale heterogeneity and can undergo microphase separation, which impacts the ion transport properties. In block copolymers that microphase separate, ordered self-assembled structures occur on longer length scales. Understanding the interplay between structure at different length scales, salt concentration, and ion transport is important for improving the performance of multifunctional polymer electrolytes. In this dissertation, two electrolyte materials are characterized: mixtures of endgroup-functionalized, short chain perfluoropolyethers (PFPEs) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) salt, and mixtures of polystyrene-block-poly(ethylene oxide) (PS-b-PEO; SEO) and LiTFSI. The PFPE/LiTFSI electrolytes are liquids in which the PFPE backbone provides non-flammability, and the endgroups resemble small molecules that solvate ions. In these electrolytes, the ion transport properties and nanoscale heterogeneity (length scale ~1 nm) are characterized as a function of endgroup using electrochemical techniques, nuclear magnetic resonance spectroscopy, and wide angle X-ray scattering. Endgroups, especially those containing PEO segments, have a large impact on ionic conductivity, in part because the salt distribution is not homogenous; we find that salt partitions preferentially into the endgroup-rich regions. On the other hand, the SEO/LiTFSI electrolytes are fully microphase-separated, solid, lamellar materials in which the PS block provides mechanical rigidity and the PEO block solvates the ions. In these electrolytes longer length scale structure (~10 nm - 1 [mu]m) influences ion transport. We study the relationships between the lamellar grain size, salt concentration, and ionic conductivity using ac impedance spectroscopy, small angle X-ray scattering, electron microscopy, and finite element simulations. In experiments, decreasing grain size is found to correlate with increasing salt concentration and increasing ionic conductivity. Studies on both of these polymer electrolytes illustrate that structure and ion transport are closely linked.

Download or read book The Impact of Polymer Electrolyte Properties on Lithium Ion Batteries written by Nacer Badi and published by Eliva Press. This book was released on 2022-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this review, different types of electrolytes and their electrical and mechanical properties have been reported and studied to evaluate their effect on LIB performance. It was noticed that the electrolyte component and solvent in polymer electrolytes have a great influence on the ionic conductivity, Li+ migration, interfacial contact between electrolyte and electrode, mechanical properties, and the performance of the entire battery. The morphology of incorporated additive materials (nanoparticles, nanowires, nanofillers, salt, etc.) may well contribute to the amelioration of the ion transport pathway, which raises the lithium-ion conductivity. A basic understanding of the chemical reaction routes and the electrolyte structure would facilitate innovation in the battery. The structural, electrochemical, and mechanical properties of new promising materials should be investigated in advance for application in advanced lithium-ion batteries. The electrochemical behavior is inextricably related to the structure. IL-based solid polymer electrolytes appear as a promising material for long-term lithium-ion batteries despite showing low ionic conductivity but exhibiting more advantages than conventional carbonate electrolytes such as good safety, stability, good electrochemical performance, good mechanical stability, and enhanced energy density. Since solid electrolytes exhibit low ionic conductivity, ILs used in SPEs increased their conductivity. In a battery, porous materials appear to offer good properties in terms of lithium ionic conductivity, with no leakage and low interface resistance, and gel-based LIBs demonstrate a good working performance, long cycling life, and high energy density. Good polymer electrolytes need to be highly conductive, safe, highly mechanically and thermally stable, and easy for film formation.

Download or read book Exploring the Effects of Nanofillers on the Lithium Ion Conduction Mechanism of Gel Polymer Electrolyte for Lithium Ion Battery Via Multiscale Molecular Simulation written by 林柏廷 and published by . This book was released on 2019 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Composition Effects on Transport Properties in Hybrid Electrolytes written by Brice Alexis Harkey and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Functional Design of Advanced Polymer Architectures for Improved Lithium ion Batteries written by David G Mackanic and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium ion batteries (LIBs) are ubiquitous for applications in consumer electronics, electric vehicles, and grid-scale energy storage. Despite rapidly increasing demand, modern LIBs face significant challenges with regards to their safety and energy density. Additionally, the rigid nature of existing LIBs precludes their use in emerging applications in flexible/wearable electronics. Polymeric materials promise to address many of the issues facing LIBs, yet the existing polymers used commercially fall short of this goal. In this work, we design functional polymer materials to address three major challenges for next-generation LIBs. We explore the structure-property relationships of these polymer architectures in the context of ion transport, mechanical properties, and electrochemical performance. In the first project, a new polymer electrolyte is designed to replace the flammable liquid electrolyte in conventional LIBs. We study the effect of lithium ion coordination in polymer electrolytes and discover a modified polymeric backbone that loosely coordinates to lithium ions. The loose coordination of this new polymer electrolyte enables an improved lithium transference number of 0.54, compared to 0.2 achieved in conventional polymer electrolytes. This polymer electrolyte is demonstrated to operate effectively in a battery with a lithium-metal anode. In the second project, the learnings of the lithium coordination environment from the first project are used to design a multifunctional polymer coating to stabilize high energy density lithium metal anodes. We combined loosely-coordinating fluorinated ligands dynamically bonded with single-ion-conductive metal centers. The resulting supramolecular polymer network functions as an excellent lithium metal coating, allowing for achievement of one of the highest-reported coulombic efficiencies and cycle lives of a lithium metal anode. A systematic investigation of the chemical structure of the coating reveals that the properties of dynamic flowability, single-ion transport, and electrolyte blocking are synergistic in improving Li-metal coating performance. This coating is applied in a commercially relevant lithium metal full-cell and increases the cycle life over two-fold compared to an uncoated anode. The final project uses supramolecular polymer design to create ultra-robust ion transport materials. We show that when soft ion conducting segments are combined with strong dynamically bonded moieties in the polymer backbone, the ion transport properties can be decoupled from the mechanical properties. This decoupling enables for the creation of polymer electrolytes with extremely high toughness and high ionic conductivity. These supramolecular materials enable the fabrication of stretchable and deformable batteries that demonstrate respectable energy density even when stretched to 70% of their original length. Overall, the work demonstrated in this thesis provides a robust understanding towards designing polymer networks with tunable ion transport and mechanical properties. Additionally, the polymer materials demonstrated here provide promising avenues toward improving the safety, energy density, and flexibility of LIBs.

Download or read book Advances in Lithium Ion Batteries written by Walter van Schalkwijk and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the decade since the introduction of the first commercial lithium-ion battery research and development on virtually every aspect of the chemistry and engineering of these systems has proceeded at unprecedented levels. This book is a snapshot of the state-of-the-art and where the work is going in the near future. The book is intended not only for researchers, but also for engineers and users of lithium-ion batteries which are found in virtually every type of portable electronic product.

Download or read book Ion Transport Mechanisms of Solid Polymer Electrolyte with Silsesquioxane Crosslinking Polyethylene Glycol Framework for Lithium Ion Battery A Molecular Simulation Study written by 方湛恩 and published by . This book was released on 2020 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structure and Electrochemical Properties of Holographically Polymerized Polymer Electrolyte Membranes for Lithium Batteries written by Derrick M. Smith and published by . This book was released on 2017 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the increasing demand for mobile technology, the next generation of power storage devices must be realized. The insertion-type electrodes typically used in commercially available secondary batteries have low capacitances; for instance, a graphitic anode has a theoretical specific capacitance of 372 mAhg-1. The most promising route to increasing the energy density is by switching the anode to Li metal, which has a specific capacitance of 3860 mAhg-1, and using stabilizing additives for the latter. However, Li metal experiences unacceptable Li dendritic failure at consumer operating conditions. Polymer electrolyte membranes (PEMs) have been explored over the past four decades to address this; however, a suitable material has not yet been found to address this failure mechanism prohibiting commercialization. In this dissertation, we demonstrate using holographic polymerization induced phase separation as a facile top-down technique to nanostructure the PEM and exploit the long-range phase separation offered by this technique to decouple the mechanical and ion transport properties. Isotropically floodlit samples were used as a baseline to examine the nanostructuring effect. For example, with 30% electrolyte, the baseline isotropic samples showed a room temperature conductivity and tensile modulus of 1.5 x 10-6 S/cm and 156 MPa, where the 1D lamellar patterned PEMs boasted an impressive improvement to both properties, 2.0 x 10-5 S/cm and 618 MPa. The nanostructuring and mechanical enhancemet effects regarding Li metal and dendritic growth were also observed using galvanostatic polarization. It was found that there was a tradeoff between certain nanostructure geometries that increased the current density and the mechanical enhancement provided by said nanostructures. Two nanostructures exhibited a 100-150 fold increase in cell lifetime before dendritic failure over the predicted lifetime based on Chazalviez's model. This top-down nanostructuring technique also uniquely offers a new exciting platform for exploring other structure-property relationships in electrochemical membranes.

Download or read book Effects of Electrolyte and Binders on the Ion Transport Mechanism and Impedance at Electrolyte Cathode Interface Within Lithium Ion Battery A Molecular Simulation Study written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymerized Ionic Liquids written by Ali Eftekhari and published by Royal Society of Chemistry. This book was released on 2017-09-18 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series covers the fundamentals and applications of different smart material systems from renowned international experts.

Download or read book Exploring the Relationship Between Polymer Topology and Ionic Conductivity written by Nam Quang Hai Nguyen and published by . This book was released on 2021 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation will be mainly exploring the relationship between polymer topology and ion transport properties of single-ion conductors (SICs) in lithium-ion battery application. Specifically, we strive to understand the impact of precise 5-carbon spacing on ion transports behavior of precision single-ion conductor. In chapter 2, the investigation was conducted on blending lithium sulfonate salt of precise 5-carbon spacing polymer electrolyte (p5PhS-Li) with poly(ethylene oxide) (PEO), a popular solvating polymer. The highest ionic conductivity of this type of SIC was achieved on the order of 10-7 S/cm at 90 °C. Results from differential scanning calorimetry (DSC) also indicated that polymer blends are at least partial miscible. The conclusion was made due to strong ionic interactions between sulfonate anions and lithium cations that lead to small magnitude of interaction parameter as well as melting point depression in PEO with complicating interpretation of transference number. We were strived to improve the ionic conductivity of single-ion conductors by altering the chemical structures of anions from sulfonate to trifluoromethylsulfonylimide salt (TFSI) that has been shown to increase electrochemical, thermal stabilities and ionic conductivity in chapter 3. Upon characterizing with 1H NMR, 19F NMR and 13C NMR, the efficiency of post polymerization reaction was obtained as high as 90 %. The conversion of sulfonated into TFSI-containing SIC (p5PhTFSI-Li) was shown to improve thermal stability as well as plasticize by an appearance of glass transition temperature (Tg) with higher TFSI content corresponds to lower (Tg). The ionic conductivity of true SIC p5PhTFSI-Li was lower than previously studied p5PhS-Li which contradicted to our hypothesis. The improvement in ionic conductivity was only observed when p5PhTFSI-Li was doped with PEO. Study by DSC also revealed that no crystallinity in PEO was detected, and these blends exhibited a single Tg which is attributed to the miscible behavior of the components. X-ray scattering also complemented with DSC study as ionic aggregates are diluted by the introduction of PEO. Realizing the immediate effect of PEO addition on the ionic conductivity of SICs, chapter 4 of the thesis further expands wider range of blend composition between PEO and p5PhTFSI-Li. Study by DSC reveals one single Tg for every blend composition which is consistent with results obtained from chapter 3. The addition of p5PhTFSI-Li retarded crystallization kinetics of PEO until it fully disrupted the crystalline phase of PEO, which proves that these two components provide greater compatibility than PEO/p5PhS-Li. Highest ionic conductivity of 6.37 x 10-4 S cm-1 was also obtained at 42 wt% of p5PhTFSI-Li, which is on par with that observed in literature TFSI-based SICs. Transference number was also observed to approach unity for experimented compositions. The future of p5PhTFSI-Li is wide open as the material will be investigated in block polymer as well as electrochemical stability. Last but not least, a side project was researched on catechol-containing precision polymer in underwater adhesion applications in chapter 5. Even though the research was not timely done, the synthesis of catechol-containing precision polymer was investigated on monomer synthesis, thermodynamics of polymerization, efficiency of polymerization and copolymerization with a similar comonomer structure. This project will leave opportunities for incoming graduate student to take over and analyze the adhesion performance the catechol-containing precision polymer.

Download or read book Functional Polymers for Beyond Li ion Batteries written by Hunter O. Ford and published by . This book was released on 2021 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Relationship Between Lithium Ion Transport and Structure and Dynamic Behavior in Polyethylene Oxide melt LiClO4 Battery Electrolytes written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of the canonical SPE ("solid" polymer electrolyte) for rechargeable "rocking chair" lithium/polymer batteries, viz. LiClO4 dissolved in molten poly(ethylene oxide) (PEO), was carried out under DOE grant FG02-04ER15573. In this study, an improved understanding was obtained of the relationship between lithium ion transport and polymer behavior in these SPEs. Among other applications, these sturdy temperature-tolerant and powerful light-weight batteries would be used in electric and electric-hybrid vehicles to reduce greenhouse gas emissions, to store unused electrical energy for peak demand loads and as compact, light-weight energy sources for aircraft and spacecraft. During the period of the grant, the American/Canadian partnership company "Avestor" fabricated and successfully demonstrated a telecommunications application of shoe-box sized batteries and representatives from Avestor visited our research lab at UNLV. They found our results interesting and relevant to their work and invited us to visit Avestor and present a talk about our efforts at UNLV. Unfortunately Avestor (who was scheduled to build a battery production facility in Apex, Nevada just North of Las Vegas) folded before the visit could be made. In the grant work, two well characterized PEO samples having molar masses distinctly below and distinctly above the melt entanglement molar mass were used and three laser light scattering techniques employed as the principal noninvasive methods of investigating liquid poly(ethylene oxide) (PEO)/LiClO4 SPEs. These investigations considered the effects of temperature, dissolved salt concentration and scattering wavevector on SPE behavior. Classical or "static" light scattering and the dynamic light scattering techniques of photon correlation spectroscopy (PCS) and Fabry-Perot interferometry (FPI) were used to study SPE static, low frequency and high frequency dynamic behaviors, respectively. Static measurements provided information about system structure while low frequency results provided information about slower (0.1-10s) more global behavior and high frequency results provided information about faster (~10-11s) more local behavior. In addition, viscometry, rheometry and thermal analysis provided vital complementary results. It was found that liquid PEO/lithium salt solutions for both PEO molar masses are random transient physical networks with measureable network and intra-network relaxation times using PCS and FPI. Thus novel and informative results addressing both large scale and small scale behavior were obtained. For example, the high sensitivity of liquid PEO electrolytes to the presence of presumably undesirable trace amounts of residual water and/or methanol was clearly evident in PCS measurements. In "unentangled" melts the activation energies for diffusive relaxation in liquid PEO/lithium salt electrolytes measured using PCS and the activation energies for viscous flow in these systems determined by viscometry were identical while thermal analyses detected no phase transitions for these systems. These results reinforced an earlier assumption that the liquid PEO/LiClO4 system is a liquid polymer "bimorph" (to our knowledge the first of its kind to be reported) with the network comprising one form of the polymer while the second form corresponds to that of a viscous damping liquid. At a given temperature, FPI characteristic relaxation times for local, between-chain motions were consistent with PCS results so that increases with increasing salt concentration were accompanied by increases in the elastic modulus and corresponding increases in system stiffness. Note that corresponding decreases in polymer segmental mobility are accompanied by reduced ion diffusivity. For entangled melts, PCS network relaxations were again observed and these systems were also considered to be bimorphs even though diffusion activation energies were distinctly larger than viscous flow activation energies - a diff ...

Download or read book Lithium Ion Transport Mechanism at The Ceramics Polymer Interface Within Composite Polymer Electrolyte for Lithium Ion Battery A Molecular Dynamics Simulation Study written by and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Charge Transport and Mechanical Properties in Ion Associating Polymeric Materials written by Joshua Everett Bostwick and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gel polymer electrolytes (GPEs) are ion-conducting polymers where the polymer matrix is swollen with a certain amount of solvent. While GPEs are able to take advantage of both the mechanical properties of the polymer matrix and the conductive properties of the solvent, they are limited due to the inverse relationship between the ionic conductivity ([sigma]o) and the modulus, diminishing their potential as next generation lithium-ion battery electrolytes. In this dissertation, we studied the fundamental properties of three different GPEs, molecular ionic composites (MICs) where the solvent is an ionic liquid (IL), single-ion-based MICs where the 'solvent' is poly(ethylene glycol), and cellulose-ionic liquid solutions, for their potential use as battery electrolytes. MICs utilize the mechanical and thermal stability of a rigid-rod sulfonated polyelectrolyte, poly(2,2')-disulfonyl-4,4'benzidine terephthalamide (PBDT), and the high conductivity, electrochemical stability, and low volatility of ILs. This allows the MICs to produce a simultaneous high modulus (from the PBDT) and a high conductivity (from the IL). The first half of this dissertation explores how the change in either the PBDT concentration with a constant IL or the IL molecular volume (Vm) and chemistry with a constant PBDT concentration affects both the mechanical and charge transport properties of the MICs. The varying PBDT concentration MICs were produced via an ion exchange method to form 3 mm diameter cylinders (ingots) while the varying IL Vm MICs were produced via solvent casting to form six free-standing films. The single-ion PBDT membranes were also formed via the solvent casting method. The mechanical properties were measured using a combination of oscillatory shear rheology and uniaxial tensile tests (only for the films), while the dielectric properties and morphology of the films were determined through dielectric relaxation spectroscopy (DRS) and atomic force microscopy (AFM) respectively. Increasing the MIC PBDT concentration with a constant IL, 1-butyl- 3-methylimidazolium tetrafluoroborate (BMIm-BF4), showed a minimal change in dynamic glass transition temperature (Tg) of roughly 2 °C through rheology with its respective IL. This allowed for the MIC ionic conductivity ([sigma]o) at elevated PBDT concentrations to be within a factor of two of the neat IL at room temperature while also producing a shear modulus (G') in the MPa range up to 200 °C. This is due to the MICs producing a two-phase environment corresponding to an IL-rich "puddle" phase and a PBDT-rich "bundle" phase, shown through the phase contrast in atomic force microscopy (AFM), where IL ions form alternating sheaths of cations and anions around each PBDT rod. As the PBDT concentration increases, these puddles shrink and produce a near single bundle phase. This potentially increases the polarizability of the MIC, shown by an increasing static dielectric constant, as well as allowing for more IL ions to contribute to [sigma]o shown by a decrease in the Haven ratio (HR), the ratio between the total number of charge carriers observed through NMR and the number conductive charge carriers that can be analyzed through the ionic conductivity. Incorporating ILs with different molecular volumes (Vm) and chemistries in the MICs with a constant PBDT concentration showed that all MICs maintain low Tgs, ranging between 0 -- 8 °C above their respective neat IL. This was confirmed through analyzing the derivative spectra from DRS to determine the dynamic Tg as well as measuring the thermal Tg through differential scanning calorimetry (DSC). The agreement in Tg between these two methods suggests that the glassy dynamics of MICs is dictated by the rearrangement of IL ions during charge transport. All MICs are able to produce high [sigma]o, ranging from 1 -- 6 mS cm-1 at 30 °C with smaller imidazolium-based cations producing higher [sigma]o than MICs with larger imidazolium cations and similar anions due to their larger molar conductivity. Tensile measurements showed that all MICs produce IL-dependent Young's modulus (E), ranging from 50 -- 500 MPa at 30 °C, up to 60 x higher when compared to the G' of the same MICs. We propose this is due the difference in the distribution of PBDT chains between the shear and tensile planes as well as the competing interactions between the IL ions and the PBDT rods. This hypothesis is supported by the AFM phase contrast images, where the 1-ethyl- 3-methylimidazolium (EMIm+) based MICs show the largest formation of the bundle phase (with very small puddles) while the BMIm+ based MICs produce a larger puddle phases as the anion Vm decreases, thus lowering E. Relating the [sigma]o to their corresponding diffusive coefficients through the Nernst-Einstein shows that all MIC have an ionicity (inverse Haven ratio, HR--1) range between 0.54 -- 0.63, suggesting that a fraction of the diffusive ions do not contribute to charge transport. Along with the IL-based MICs, we analyzed the dielectric and mechanical dynamics of single-ion conducting PBDT-based membranes by incorporating poly(ethylene glycol) with a molecular weight of 400 g mol-1 (PEG400) and either Na+ or Li+ counterions are studied in detail. Varying the PBDT and PEG400 wt% allowed for the preparation of varying PBDT concentrated membranes. All membranes have low DSC Tgs, regardless of counterion attached to the PBDT and the Tg increases with elevated PBDT concentration. The ionic conductivity of the membranes systematically decreases with increasing PBDT concentration, ranging from 0.1 -- 7 [mu]S cm-1` at 30 °C and reaching 100 [mu]S cm-1 at 120 °C in the lowest NaPBDT concentration film. Normalizing the temperature-dependent ionic conductivities divided by their respective Coulombic dielectric constant by the dynamic DRS Tg show that all data roughly collapse onto a single curve, suggesting that the glassy dynamics are dictated the speed of the diffusive motion and the dissociation of ion-pairs produced from strong ionic interactions in the membrane. Tensile stress-strain analysis on the membranes reveal that the E is dominated by the counterion used with the Na+-based membranes producing an E ranging from approximately 100 -- 400 MPa while the Li+-based membranes produced an E ranging from approximately 300 -- 2100 MPa. We suggest that Li+ counterions forms a stronger network with the PBDT sulfonate groups off of the PBDT than the Na+ counterions. The smaller Li+ binds to the sulfonates on the PBDT chain more strongly, confirming that the modulus of this class of materials has ionic origins. We investigated the dielectric dynamics of cellulose in ILs through DRS to understand the fundamental properties of cellulose-IL solutions with varying cellulose concentration and IL. Like the MICs, the cellulose-IL solutions showed relatively high ionic conductivity compared to their respective neat IL, all within a factor of 4 at 30 °C at the highest cellulose concentration, as well as minimal increase in the dynamic DRS Tg (up to 10 °C). The ionic conductivity normalized by the DRS Tg show all data collapsing on a single curve with each IL suggesting that the glassy dynamics in these solutions is dictated by the ion arrangement produced on charge transport. Additionally, increasing the cellulose concentration increases the static dielectric constant relative to the neat ILs suggesting the association between the cellulose and IL ions enhances the polarizability of the solution over the neat IL.

Download or read book Nanostructured Polymer Electrolyte Designs for Lithium ion Batteries written by Melody A. Morris and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithium-ion batteries (LiBs) have become dominant energy storage devices because of their high energy densities, minimal memory effects, and low self-discharge rates. However, the mechanical failure of the liquid electrolyte present in most commercial LiBs have led to a number of high-profile incidents, including the grounding of the Boeing Dreamliner airplane. To replace the liquid electrolyte, block polymers (BPs), in which one polymer block has mechanical integrity (high glass transition temperature [Tg] and shear modulus) and the other is efficient at solvating and conducting lithium ions, have been harnessed as a way to decouple the competing constraints required in an electrolyte material. Polystyrene-block-poly(oligo-oxyethylene methacrylate) [PS-b-POEM]-based BPs were used throughout these studies. Four approaches have been leveraged in this dissertation work to improve the mechanical and electrochemical properties of BP electrolytes. First, self-doped BP materials have been developed to reduce the concentration polarization in the electrolyte so that only lithium ions were mobile. The lithium conductivity of these materials were similar to the salt-doped BPs upon normalization by the Tg of the conducting block, and strategies to further improve the lithium conductivity are suggested. Second, the lithium and polymer distributions were established quantitatively in a salt-doped BP electrolyte material, and key properties, like the effective Flory-Huggins interaction parameter, were calculated using strong segregation theory. Third, homopolymer-blended BP composite electrolytes were studied as a function of the homopolymer molecular weight. Though blends with lower-molecular-weight homopolymers had higher lithium mobilities, blends with higher-molecular-weight homopolymers showed enhanced ionic conductivity as a result of structural differences. Finally, a BP in which the high-Tg component was replaced with a bio-based alternative, poly(guaiacyl methacrylate), was probed. The conductivity of the bio-based BP was higher than that of the PS-b-POEM BP doped at similar lithium concentrations, and replacement of the PGM with a higher-Tg bio-based component would promote improved conductivities at higher operating temperatures with maintained mechanical robustness. Overall, the work in this dissertation contributed new strategies that promoted the enhancement of mechanical and electrochemical properties in BP electrolytes for next-generation LiBs.