Advancements in Polymer Electrolytes for Solid-State Battery Applications
Summary
Solid-state battery architectures promise safer operation and higher energy densities than conventional lithium-ion cells. At the heart of these systems, polymer electrolytes combine mechanical flexibility with ionic conductivity, enabling thin, conformal interfaces and dendrite suppression at lithium metal electrodes. Recent progress has centred on optimising polymer matrices—poly(ethylene oxide), polyacrylonitrile, poly(vinylene carbonate) and related co-polymers—through the incorporation of plasticiser crystals, ceramic nanoparticles and in situ crosslinking to yield gel and composite electrolytes with conductivities surpassing 10−3 S cm−1 at ambient temperature. Techniques such as UV or γ-ray-initiated polymerisation, electrochemical overoxidation and interpenetrating network construction have delivered mechanically robust membranes with high Li+ transference numbers, wide electrochemical stability windows (>5 V) and extended cycling lifetimes. Garnet-type oxide fillers (e.g. Li₇La₃Zr₂O₁₂ derivatives) further enhance dimensional stability and suppress dendritic propagation. Collectively, these advances are forging pathways to lithium-metal and high-voltage cathode compatibility, with implications for electric vehicles, portable electronics and grid-scale storage.
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Advancements in Polymer Electrolytes for Solid-State Battery Applications publication trend
The graph below shows the total number of articles in advancements in polymer electrolytes for solid-state battery applications across all publications each year (not limited to Nature Index journals).
Technical terms
Solid polymer electrolyte: A solid ionic conductor comprising a polymer host and dissolved salt, enabling ion transport without liquid solvents.
Interpenetrating network: A composite of two or more polymer networks physically intertwined to enhance mechanical strength and ionic pathways.
Li⁺ transference number: The fraction of total ionic current carried by lithium ions; higher values reduce concentration polarisation.
Electrochemical stability window: The voltage range over which an electrolyte remains inert without decomposition.
Ceramic filler: Inorganic particles (e.g. garnet oxides) added to polymer matrices to improve mechanical stability and ionic conductivity.
References
- Ionic conductivity enhancement in solid polymer electrolytes by electrochemical in situ formation of an interpenetrating network. RSC Advances (2020).
- In Situ Construction of Elastic Solid-State Polymer Electrolyte with Fast Ionic Transport for Dendrite-Free Solid-State Lithium Metal Batteries. Nanomaterials (2024).
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