A high-flash-point quasi-solid polymer electrolyte for stable nickel-rich lithium metal batteries  

作　　者：Yu-Kun Liu Xue-Yan Huang Jun-Dong Zhang Wei-Jin Kong Juan Du Ximin Zhai Xiaofe Bie Huanli Sun Hao Zhang Chong Yan Xuechun Hao Lizhen Fan Ai-Bing Chen Chen-Zi Zhao 

机构地区：[1]College of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China [2]Tsinghua Center for Green Chemical Engineering Electrification,Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [3]China FAW Corporation Limited,Chuangchun 130013,Jilin,China [4]Beijing Key Laboratory of Advanced Chemical Energy Storage Technologies and Materials,Research Institute of Chemical Defense,Bejing 100191,China [5]Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China [6]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [7]Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,Shanxi,China [8]Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Energy Chemistry》2024年第12期149-158,共10页能源化学（英文版）

基　　金：the S&T Program of Hebei (Grant Nos. 22344402D,22373709D);the National Natural Science Foundation of China(Grant Nos. 22108151, 22108202, 22109084, 22209010,22379014, and 22309101);the Beijing Natural Science Foundation(Grant Nos. Z200011, L233004);the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2021QNRC001);the Seed Fund of Shanxi Research Institute for Clean Energy;the support from the Department of Science and Technology of Jilin Province (Grant No. 20210301021GX)。

摘　　要：In the exploration of next-generation high-energy–density batteries,lithium metal is regarded as an ideal candidate for anode materials.However,lithium metal batteries (LMBs) face challenges in practical applications due to the risks associated with organic liquid electrolytes,among which their low flash points are one of the major safety concerns.The adoption of high flash point quasi-solid polymer electrolytes(QSPE) that is compatible with the lithium metal anode and high-voltage cathode is therefore a promising strategy for exploring high-performance and high-safety LMBs.Herein,we employed the in-situ polymerization of poly (epoxidized soya fatty acid Bu esters-isooctyl acrylate-ditrimethylolpropane tetraacrylate)(PEID) to gel the liquid electrolyte that formed a PEID-based QSPE (PEID-QSPE).The flash point of PEID-QSPE rises from 25 to 82℃ after gelation,contributing to enhanced safety of the battery at elevated temperatures,whereas the electrochemical window increases to 4.9 V.Moreover,the three-dimensional polymer framework of PEID-QSPE is validated to facilitate the uniform growth of the solid electrolyte interphase on the anode,thereby improving the cycling stability of the battery.By employing PEID-QSPE,the Li|LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2) cell achieved long-term cycling stability (Coulombic efficiency,99.8%;>200 cycles at 0.1 C) even with a high cathode loading (~5 mg cm^(-2)) and an ultrathin Li(~50μm).This electrolyte is expected to afford inspiring insights for the development of safe and long-term cyclability LMBs.

关 键 词：Solid-state batteries Lithium metal anodes Quasi-solid polymer electrolytes High flash points Cross-linking polymerization 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]