Stable Cycling of All-Solid-State Lithium Metal Batteries Enabled by Salt Engineering of PEO-Based Polymer Electrolytes
Lujuan Liu , Tong Wang , Li Sun , Tinglu Song , Hao Yan , Chunli Li , Daobin Mu , Jincheng Zheng , Yang Dai
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (2) : 12580
Stable Cycling of All-Solid-State Lithium Metal Batteries Enabled by Salt Engineering of PEO-Based Polymer Electrolytes
Poly (ethylene oxide) (PEO)-based polymer electrolytes show the prospect in all-solid-state lithium metal batteries; however, they present limitations of low room-temperature ionic conductivity, and interfacial incompatibility with high voltage cathodes. Therefore, a salt engineering of 1, 1, 2, 2, 3, 3-hexafluoropropane-1, 3-disulfonimide lithium salt (LiHFDF)/LiTFSI system was developed in PEO-based electrolyte, demonstrating to effectively regulate Li ion transport and improve the interfacial stability under high voltage. We show, by manipulating the interaction between PEO matrix and TFSI--HFDF-, the optimized solid-state polymer electrolyte achieves maximum Li+ conduction of 1.24 × 10-4 S cm-1 at 40 ℃, which is almost 3 times of the baseline. Also, the optimized polymer electrolyte demonstrates outstanding stable cycling in the LiFePO4/Li and LiNi0.8Mn0.1Co0.1O2/Li (3.0-4.4 V, 200 cycles) based all-solid-state lithium batteries at 40 ℃.
all-solid-state battery / high voltage / li-ion conductivity / molecular interaction / poly(ethylene oxide)
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2022 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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