Boosting Li + Conductivity and Oxidation Stability of Solid Polymer Electrolytes Using a Sustainable Montmorillonite-Based Ion Conductor

作者：Wankai Wang, Yanfei Yang, Junping Zhang · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.4c05942 · 被引用次数：21 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Advanced Battery Technologies Research

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 LiFePO 4 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.