A surfactant-modified composite separator for high safe lithium ion battery

作     者：Botao Yuan Niandong He Yifang Liang Liwei Dong Jipeng Liu Jiecai Han Weidong He Yuanpeng Liu Botao Yuan;Niandong He;Yifang Liang;Liwei Dong;Jipeng Liu;Jiecai Han;Weidong He;Yuanpeng Liu

作者机构：National Key Laboratory of Science and Technology on Advanced Composites in Special EnvironmentsCenter for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080HeilongjiangChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080HeilongjiangChina Chongqing Research InstituteHarbin Institute of TechnologyChongqing 401151China 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第76卷第1期

页      面：398-403,I0010页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by the Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments the National Natural Science Foundation of China(12002109) the China Postdoctoral Science Foundation(2020M670898) the Heilongjiang Postdoctoral Fund(LBH-Z20060) 

主　　题：Composite separator PTFE Surfactant High safe Lithium ion batteries 

摘      要：Separators have been gaining increasing attention to improve the performance of lithium ion batteries(LIBs),especially for high safe and long cycle ***,commercial polyolefin separators still face the problems of rapid capacity decay and safety issues due to the poor wettability with electrolytes and low thermal ***,a novel composite separator is proposed by introducing a surfactant of sodium dodecyl thiosulfate(SDS)into the polytetrafluoroethylene(PTFE)substrate with the binder of polyacrylic acid(PAA)through the suction filtration *** introduction of PAA/SDS enhances the adsorption energy between PTFE substrate and electrolyte through density functional theory calculations,which improves wettability and electrolyte uptake of the separator *** asachieved composite separator enables the LIBs to own high Li^(+)conductivity(0.64×10^(-3)S cm^(-1))and Li^(+)transference number(0.63),further leading to a high capacity retention of 93.50%after 500 cycles at 1 *** addition,the uniform and smooth surface morphology of Li metal employed the composite separator after cycling indicates that the lithium dendrites can be successfully *** work indicates a promising route for the preparation of a novel composite separator for high safe LIBs.