High-modulus solid electrolyte interphase layer with gradient composition enables long-cycle all-solid-state lithium-sulfur batteries

作     者：Huanhuan Duan Jinhai Liu Jiafeng He Linyuan Ma Yuanfu Deng Guohua Chen 

作者机构：Guangdong Provincial Key Laboratory of Fuel Cell TechnologySchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Guangdong Provincial Research Center of Electrochemical Energy EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina School of Energy and EnvironmentCity University of Hong KongTat Chee AvenueKowloonHong Kong 999077China 

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

年 卷 期：2024年第98卷第11期

页      面：87-95页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：National Natural Science Foundation of China (Grant Nos. 22178125 and 21875071) 

主　　题：All-solid-state lithium-sulfur batteries PEO-based electrolyte SEI layer High modulus Long cycling stability 

摘      要：All-solid-state lithium-sulfur batteries(ASSLSBs) have become one of the most potential candidates for the next-generation high-energy systems due to their intrinsic safety and high theoretical energy ***, PEO-based ASSLSBs face the dilemma of insufficient Coulombic efficiency and long-term stability caused by the coupling problems of dendrite growth of anode and polysulfide shuttle of cathode. In this work, 1,3,5-trioxane(TOX) is used as a functional additive to design a PEO-based composite solidstate electrolyte(denoted as TOX-CSE), which realizes the stable long-term cycle of an ASSLSB. The results show that TOX can in-situ decompose on the anode to form a composite solid electrolyte interphase(SEI) layer with rich-organic component. It yields a high average modulus of 5.0 GPa, greatly improving the mechanical stability of the SEI layer and thus inhibiting the growth of dendrites. Also,the robust SEI layer can act as a barrier to block the side reaction between polysulfides and lithium *** a result, a Li-Li symmetric cell assembled with a TOX-CSE exhibits prolonged cycling stability over 2000 h at 0.2 m A cm^(-2). The ASSLSB also shows a stable cycling performance of 500 cycles at 0.5 *** work reveals the structure–activity relationship between the mechanical property of interface layer and the battery s cycling stability.