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Boosting Li+ Conductivity and Oxidation Stability of Solid Polymer Electrolytes Using a Sustainable
Wankai Wang1,2, Yanfei Yang1,2, Junping Zhang1,2
1Research Center of Resource Chemistry and Energy Materials, Key Laboratory of Clay Mineral of Gansu, and State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000 Lanzhou, P. R. China.
Abstract:
Solid polymer electrolytes (SPEs), such as poly(ethylene oxide) (PEO), have garnered significant attention due to their compatibility with commercial lithium-ion (Li+) battery manufacturing, yet their application is limited by poor Li+ transport efficiency and low oxidation stability. We hypothesize that these challenges can be addressed by designing ion-conductors that interact with the terminal -OH groups of PEO chains. To verify this, we developed a sustainable ion-conductor (LSM) by intercalating lithium bis(trifluoromethanesulfonyl)imide and succinonitrile into the interlayer space of montmorillonite (MMT) nanosheets. The LSM ion-conductor significantly enhanced Li conductivity, Li+ transference number, and oxidation stability of PEO-based SPEs. Li metal batteries with PEO/LSM SPEs and LiFePO4 cathode showed superior rate performance and cycling stability. Pouch batteries with high-voltage NCM811 cathode maintained stable operation after repeated mechanical deformation. This study provides new insights into designing advanced SPEs for Li metal batteries via a straightforward intercalation strategy using naturally abundant 2D nanomaterials.
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