超薄烯-巯交联聚合物电解质及其固态高性能锂金属电池  

Ultrathin thiol-ene crosslinked polymeric electrolyte for solid-state and high-performance lithium metal batteries

作　　者：李志峰 王天羿 钟雷 肖敏 韩东梅 王拴紧 张世超 黄盛 孟跃中 Zhifeng Li;Tianyi Wang;Lei Zhong;Min Xiao;Dongmei Han;Shuanjin Wang;Shichao Zhang;Sheng Huang;Yuezhong Meng(The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies,School of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China;School of Chemical Engineering and Technology,Sun Yat-Sen University,Zhuhai 519082,China;School of Materials Science and Engineering,Beihang University,Beijing 100083,China)

机构地区：[1]The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies,School of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]School of Chemical Engineering and Technology,Sun Yat-Sen University,Zhuhai 519082,China [3]School of Materials Science and Engineering,Beihang University,Beijing 100083,China

出　　处：《Science China Materials》2023年第4期1332-1340,共9页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program(2019YFA0705701);the National Natural Science Foundation of China(22179149,22075329,22008267,51573215 and 21978332);the Basic and Applied Basic Research Foundation of Guangdong province(2021A0505030022,2019A1515010803 and 2020A1515011445);Guangzhou Scientific and Technological Planning Project(201804020025 and 201904010271)。

摘　　要：固态聚合物电解质(SPE)是下一代安全电池系统的潜在材料,但SPE不能同时保持较高的机械强度和离子传导率,使下一步研究进入瓶颈.在此,我们通过原位点击反应在静电纺丝聚酰亚胺(PI)膜上制备了一种具有交联结构的聚醚硫醚电解质,厚度仅为19μm.由于烯-巯网络的交联结构和静电纺丝PI膜的增强作用,该SPE膜在60℃下具有135 MPa的储能模量,2.24×10^(-4)S cm^(-1)的离子传导率和4.0 V的电化学稳定窗口,并且锂-锂对称电池在0.1 m A cm^(-2)下循环超过800 h,展现出了优异的循环稳定性.用该超薄聚合物电解质膜组装的LiFePO_(4)/Li电池在60℃,0.5 C下能够循环超过250圈.这项工作开发了一种用于固态高性能锂金属电池的新型聚合物电解质.Solid polymer electrolyte(SPE)is a potential material for the next-generation safe battery system.However,the inability of SPEs to maintain mechanical strength and ionic conductivity is a bottleneck in further research.Here,a poly(ether-thioether)electrolyte with a thiol-ene crosslinked network was prepared by in situ click polymerization and supported on an electro-spun polyimide(PI)mat to provide an ultrathin membrane(19μm in thickness).Combining a thiol-ene crosslinked network and the reinforcement of the electro-spun PI mat,this SPE membrane obtains high storage modulus(135 MPa),high ionic conductivity(2.24×10^(-4)S cm^(-1)),and wide electrochemical window(up to 4.0 V)at 60℃.In addition,the Li-Li symmetrical cell based on the asprepared electrolyte demonstrates stable cycling performance during Li plating/stripping,lasting more than 800 h at 0.1 m A cm^(-2).Such LiFePO_(4)/Li cells with an ultrathin thiol-ene network SPE membrane achieve over 250-cycle stability at 0.5 C and 60℃.This work develops a new ultrathin polymer electrolyte for stable solid-state and high-performance lithium metal batteries.

关 键 词：静电纺丝 交联结构 聚合物电解质 交联聚合物 点击反应 电池系统 离子传导率 机械强度 

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]