Ultrastrong nonflammable in-situ polymer electrolyte with enhanced interface stability boosting high-voltage Li metal batteries under harsh conditions  

作　　者：Lisi Xu Xuan Wang Yilu Wu Chaoyang Li Kuirong Deng Zhenhua Yan 

机构地区：[1]School of Applied Physics and Materials,Wuyi University,Jiangmen 529020,Guangdong,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China [3]Hubei Institute of Aerospace Chemotechnology,Xiangyang 441003,Hubei,China

出　　处：《Journal of Energy Chemistry》2025年第3期63-72,共10页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22375116,22001057);the Science Foundation of High-Level Talents of Wuyi University(2019AL017,2021AL002);Tianjin Lishen Battery Co.,Ltd。

摘　　要：In-situ polymer electrolytes prepared by Li salt-initiated polymerization are promising electrolytes for solid-state Li metal batteries owing to their enhanced interface contact and facile and green preparation process.However,conventional in-situ polymer electrolytes suffer from poor interface stability,low mechanical strength,low oxidation stability,and certain flammability.Herein,a silsesquioxane(POSS)-nanocage-crosslinked in-situ polymer electrolyte(POSS-DOL@PI-F)regulated by fluorinated plasticizer and enhanced by polyimide skeleton is fabricated by Li salt initiated in-situ polymerization.Polyimide skeleton and POSS-nanocage-crosslinked network significantly enhance the tensile strength(22.8 MPa)and thermal stability(200℃)of [e-mail] plasticizer improves ionic conductivity(6.83×10^(-4)S cm^(-1)),flame retardance,and oxidation stability(5.0 V)of [e-mail] fluorinated plasticizer of POSS-DOL@PI-F constructs robust LiF-rich solid electrolyte interphases and cathode electrolyte interphases,thereby dramatically enhancing the interface stability of Li metal anodes and LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NCM811)cathodes.POSS-DOL@PI-F enables stable,long-term(1200 h),and dendrite-free cycle of Li‖Li cells.POSS-DOL@PI-F significantly boosts the performance of Li‖NCM811cells,which display superior cycle stability under harsh conditions of high voltage(4.5 V),high temperature(60℃),low temperature(-20℃),and high areal capacity.This work provides a rational design strategy for safe and efficient polymer electrolytes.

关 键 词：Polymer electrolytes Interface stability Li salt-initiated polymerization Flame retardant Mechanical strength 

分 类 号：TM912[电气工程—电力电子与电力传动] TM911.1