Rapidly In Situ Cross-Linked Poly(butylene oxide) Electrolyte Interface Enabling Halide-Based All-Solid-State Lithium Metal Batteries
Jing Luo, Qian Sun, Jianwen Liang, Keegan R. Adair, Feipeng Zhao, Sixu Deng, Yang Zhao, Ruying Li, Huan Huang, Rong Yang, Shangqian Zhao, Jiantao Wang, Xueliang Sun
Abstract
Halide-based solid-state halide electrolytes (SSEs) were recently revived as promising candidates for next-generation all-solid-state batteries due to their superionic conductivity, direct compatibility with high-voltage cathodes, and scalable production. However, the incompatibility between halide SSEs and lithium metal anodes remains a main challenge to achieve high energy density. Herein, we demonstrate a thin cross-linked poly(butylene oxide) solid polymer electrolyte (xPBO SPE) interlayer on the superionic Li 3 InCl 6 SSE to enable lithium metal compatibility. A rapid and solvent-free in situ cross-linking process is developed by reaction between a 0.5 s pulse of trimethylaluminum vapor and the hydroxyl terminal groups of poly(butylene oxide). The Li–Li symmetric cells using xPBO-SPE@Li 3 InCl 6 demonstrate a highly stable cycling performance over 1100 h and up to 1.0 mA cm –2 and 1.0 mAh cm –2 . All-solid-state lithium metal battery (ASSLMB) performance with a LiCoO 2 cathode is presented. This new rapid cross-linking strategy shall inspire more possibilities for lithium metal anode integration in ASSLMBs.