LiPAA with Short-chain Anion Facilitating Li_(2)S_(x)(x≤4)Reduction in Lean-electrolyte Lithium–sulfur Battery

作     者：Jizong Zhang Mingming Chen Yu Si Jian Guo Tianli Wu Chengyang Wang Xiaolei Wang Jizong Zhang;Mingming Chen;Yu Si;Jian Guo;Tianli Wu;Chengyang Wang;Xiaolei Wang

作者机构：Key Laboratory for Green Chemical Technology of MOESchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China Department of Chemical and Materials EngineeringUniversity of AlbertaEdmonton AB T6G 1H9Canada 

出 版 物：《Energy & Environmental Materials》 (能源与环境材料（英文）)

年 卷 期：2022年第5卷第3期

页      面：877-882页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by National Nature Science Foundation of China(NSFC22078228) 

主　　题：lean electrolyte polysulfides targeting transfer mass transfer interfacial reaction 

摘      要：Lean electrolyte usage in lithium–sulfur battery(LSB)meets the demand of the high energy ***,lean condition makes the electrolyte-related interface discrete,leading to retardation of ion transfer that depends on ***,electrochemical reactions face ***,lithium polyacrylate acid(LiPAA)with short-chain anions(molecular weight of 2000)is introduced into the *** of the polysulfide(PS)-philic instinct of the short-chain PAA anions,short-chain PS is captured inside of the *** addition,LiPAA supplies Li^(+)to the short-chain PS *** strong interaction between Li_(2)S_(4)and LiPAA effectively decreases Li_(2)S_(4)migration to the anode during *** a sense,the ion mass transfer pattern is thus changed comparing to traditional long-way mode between cathode and *** intermittent titration technique(GITT)proves that the interfacial reaction resistance is greatly decreased in the region where Li_(2)S_(x)(x≤4)reduction contributes *** the same time,the reversibility of electrochemical reduction/oxidation is *** to the accelerated Li_(2)S_(x)(x≤4)reduction,Li implanting of only 0.3 wt.%plus O introduction up to 1.4 wt.%enables the LSB perform well even with 1/4 of regular electrolyte dosage(5μL mg^(-1))and high-sulfur loading(4.2 mg cm^(-2)),increasing its rate capacity C_(0.8/0.5)from 52.6%(without the LiPAA)to 92.3%(with the LiP AA)as well as a capacity of 518.7 mAh g^(-1)after 400 cycles at 0.8 mA cm^(-2).