Flyash/polymer composite electrolyte with internal binding interaction enables 
highly-stable extrinsic-interfaces of all-solid-state lithium batteries

Wang, Xufeng; Fu, Chuankai; Feng, Zhijun; Huo, Hua; Yin, Xucai; Gao, Guolin; Yin, Geping; Ci, Lijie; Tong, Yujin; Jiang, Zaixing; Wang, Jiajun

doi:10.1016/j.cej.2021.131041

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Flyash/polymer composite electrolyte with internal binding interaction enables highly-stable extrinsic-interfaces of all-solid-state lithium batteries

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Tong, Yujin
Faculty of Physics, Duisburg-Essen University;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Wang, X., Fu, C., Feng, Z., Huo, H., Yin, X., Gao, G., et al. (2022). Flyash/polymer composite electrolyte with internal binding interaction enables highly-stable extrinsic-interfaces of all-solid-state lithium batteries. Chemical Engineering Journal, 428: 131041. doi:10.1016/j.cej.2021.131041.

Cite as: https://hdl.handle.net/21.11116/0000-0008-E46A-0

Abstract

Satisfactory electrochemical stability of extrinsic-interfaces between electrodes and electrolyte is the prerequisite for the safe and durable applications of all-solid-state Lithium batteries (ALBs). Unfortunately, the oxidative decomposition of anions from Li-salt at the extrinsic-interfaces of cathode side leads to the electrochemical instability during charge process. Here, a novel composite polymer electrolyte (CPE) containing flyash-treated (FA) submicro/micron particles and poly(ethylene oxide) (PEO) matrix is reported. After the addition of FA filler, Li⁺ transference number increases from 0.21 to 0.37 and electrochemical stability window reaches 5.2 V. FA as filler can efficiently immobilize (trifluoromethanesulfonyl) imide (TFSI^–) anions and mitigate their irreversible oxidative decomposition at the extrinsic-interface of cathode||CPE due to the internal binding interaction between TFSI^– anions and FA particles. ALBs using CPE with FA can not only provide stable extrinsic-interfaces for uniform Li deposition, but also tolerate strong electrochemical polarization with excellent cycling performance.