Interfacial fusion-enhanced 11 μm-thick gel polymer electrolyte for high-performance lithium metal batteries  

作　　者：Ying Jiang Xinyue Hong Peng Huang Jing Shi Wen Yan Chao Lai 

机构地区：[1]School of Chemistry and Materials Science,Jiangsu Normal University,Xuzhou 221116,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2024年第11期58-66,共9页能源化学（英文版）

基　　金：National Natural Science Foundation of China (22222902, 22209062);Natural Science Foundation of the Jiangsu Higher Education Institutions of China (22KJB150004);Youth Talent Promotion Project of Jiangsu Association for Science and Technology of China (JSTJ-2022-023);Undergraduate Innovation and Entrepreneurship Training Program (202310320066Z)。

摘　　要：In the pursuit of ultrathin polymer electrolyte(<20 μm) for lithium metal batteries, achieving a balance between mechanical strength and interfacial stability is crucial for the longevity of the electrolytes.Herein, 11 μm-thick gel polymer electrolyte is designed via an integrated electrode/electrolyte structure supported by lithium metal anode. Benefiting from an exemplary superiority of excellent mechanical property, high ionic conductivity, and robust interfacial adhesion, the in-situ formed polymer electrolyte reinforced by titanosiloxane networks(ISPTS) embodies multifunctional roles of physical barrier, ionic carrier, and artificial protective layer at the interface. The potent interfacial interactions foster a seamless fusion of the electrode/electrolyte interfaces and enable continuous ion transport. Moreover, the built-in ISPTS electrolyte participates in the formation of gradient solid-electrolyte interphase(SEI) layer, which enhances the SEI's structural integrity against the strain induced by volume fluctuations of lithium anode.Consequently, the resultant 11 μm-thick ISPTS electrolyte enables lithium symmetric cells with cycling stability over 600 h and LiFePO_(4) cells with remarkable capacity retention of 96.6% after 800 cycles.This study provides a new avenue for designing ultrathin polymer electrolytes towards stable, safe,and high-energy–density lithium metal batteries.

关 键 词：Ultrathin gel polymer electrolyte Integrated electrode/electrolyte structure Quasi-solid-state lithium metal battery Solid-electrolyte interphase 

分 类 号：TQ317[化学工程—高聚物工业] O646[理学—物理化学] TM912[理学—化学]