Polymer Electrolytes

Star block copolymer electrolytes with a lithium-ion conducting phase are investigated in the present work to assess the influence of this complex architecture compared to that of the linear one, on both, bulk morphology and ionic conductivity. For that purpose, the controlled synthesis of a series of poly(styrene-co-benzyl methacrylate)-b-poly[oligo(ethylene glycol) methyl ether acrylate] [P(S-co-BzMA)-b-POEGA] block copolymers (BCPs) by reversible addition–fragmentation transfer polymerization was performed from either a monofunctional or a tetrafunctional chain transfer agent containing trithiocarbonate groups. We emphasized how a small amount of styrene (6 mol %) drastically improved the control of the RAFT polymerization of benzyl methacrylate mediated by the tetrafunctional chain transfer agent. Transmission electron microscopy and small-angle X-ray scattering demonstrated a clear segregation of the BCPs in the presence of lithium salt. Interestingly, the star BCPs gave rise to highly ordered lamellar structures as compared to that of the linear analogues. Consequently, the reduced lamellae tortuosity of self-assembled star BCPs improved the lithium conductivity by more than 8 times at 30 °C for ∼30 wt % of the POEGA conductive phase.

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“…On the other hand, the Arrhenius model is associated to a Grotthuss mechanism of ion transport. 41 The corresponding expression is…”

Section: Raft Copolymerization Of Styrene and Benzylmentioning

confidence: 99%

Improved Solid Electrolyte Conductivity via Macromolecular Self-Assembly: From Linear to Star Comb-like P(S-co-BzMA)-b-POEGA Block Copolymers

Aniagbaoso

Król

Ruokolainen

et al. 2023

ACS Appl. Mater. Interfaces

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“…Plasticizers, with a low molecular weight, organic solvents, or ionic liquids, can increase the amorphous content of a polymer and, thus, increase the ionic conductivity [ 11 ]. For example, low-molecular-weight polyethylene glycol (PEG) has been broadly applied as a plasticizer in PEO–salt complexes [ 7 ].…”

Section: Performance Metricsmentioning

confidence: 99%

“…This process demolishes the consistency of a single polymer chain, forming the desired amorphous polymer. For example, according to Tanaka et al [ 11 ], the blending of PEO with poly(ethylene imine) (PEI) resulted in an ionic conductivity of ~10 −4 S·cm −1 at 30 °C. A representative example of a blending polymer is presented in Figure 6 .…”

Section: Performance Metricsmentioning

confidence: 99%

“…Nevertheless, hazards (such as high flammability) and poor recyclability still restrict their use in a wide range of technological applications [ 8 ]. These limitations guide the development of novel and versatile high-performance electrolytes to significantly improve the safety issues and electrolyte leakages, which are known to limit the overall performance of a Li + -based battery [ 9 , 10 , 11 ]. This has led to a recent rise in promising alternative materials, including solid-state electrolytes due to their intrinsic slower reactivity, resulting in a longer device cycle life when compared to the liquid counterparts [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

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Designing Versatile Polymers for Lithium-Ion Battery Applications: A Review

et al. 2022

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Solid-state electrolytes are a promising family of materials for the next generation of high-energy rechargeable lithium batteries. Polymer electrolytes (PEs) have been widely investigated due to their main advantages, which include easy processability, high safety, good mechanical flexibility, and low weight. This review presents recent scientific advances in the design of versatile polymer-based electrolytes and composite electrolytes, underlining the current limitations and remaining challenges while highlighting their technical accomplishments. The recent advances in PEs as a promising application in structural batteries are also emphasized.

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“…Gel polymer electrolytes (GPEs) can circumvent the problems mentioned above. The gel electrolytes are made by a host polymer matrix (PMMA, PEO, PVC, PVDF, PVDF-HFP, PAN) that can host lithium salt (LiClO 4 , LiCF 3 SO 3 , LiBF 4 ) dispersed into a solution of organic solvent (PC, EC, DEC, DMC) [ 1 , 7 , 8 , 9 ]. The diffusion of Li + cations through the polymer matrix is obtained by using a high dielectric solvent that promotes the dissociation of the salt (Li + and counter ions) in the polymeric matrix, which ensures the high ionic conductivity of the gel electrolyte [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Plasticizers and Salt Concentrations Effects on Polymer Gel Electrolytes Based on Poly (Methyl Methacrylate) for Electrochemical Applications

Rizzuto

Teeters

Barberi

et al. 2022

Gels

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This work describes the electrochemical properties of a type of PMMA-based gel polymer electrolytes (GPEs). The gel polymer electrolyte systems at a concentration of (20:80) % w/w were prepared from poly (methyl methacrylate), lithium perchlorate LiClO4 and single plasticizer propylene carbonate (PMMA-Li-PC) and a mixture of plasticizers made by propylene carbonate and ethylene carbonate in molar ratio 1:1, (PMMA-Li-PC-EC). Different salt concentrations (0.1 M, 0.5 M, 1 M, 2 M) were studied. The effect of different plasticizers (single and mixed) on the properties of gel polymer electrolytes were considered. The variation of conductivity versus salt concentration, thermal properties using DSC and TGA, anodic stability and FTIR spectroscopy were used in this study. The maximum ionic conductivity of σ = 0.031 S/cm were obtained for PMMA-Li-PC-EC with a salt concentration equal to 1 M. Ion-pairing phenomena and all ion associations were observed between lithium cations, plasticizers and host polymers through FTIR spectroscopy. The anodic stability of the PMMA-based gel polymer electrolytes was recorded up to 4 V. The glass temperatures of these electrolytes were estimated. We found they were dependent on the plasticization effect of plasticizers on the polymer chains and the increase of the salt concentration. Unexpectedly, it was determined that an unreacted PMMA monomer was present in the system, which appears to enhance ion conduction. The presence and possibly the addition of a monomer may be a technique for increasing ion conduction in other gel systems that warrants further study.

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Polymer Electrolytes

Cited by 7 publications

References 127 publications

Improved Solid Electrolyte Conductivity via Macromolecular Self-Assembly: From Linear to Star Comb-like P(S-co-BzMA)-b-POEGA Block Copolymers

Improved Solid Electrolyte Conductivity via Macromolecular Self-Assembly: From Linear to Star Comb-like P(S-co-BzMA)-b-POEGA Block Copolymers

Designing Versatile Polymers for Lithium-Ion Battery Applications: A Review

Plasticizers and Salt Concentrations Effects on Polymer Gel Electrolytes Based on Poly (Methyl Methacrylate) for Electrochemical Applications

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