Boosting redox activity on MXene-induced multifunctional collaborative interface in high Li2S loading cathode for high-energy Li-S and metallic Li-free rechargeable batteries

作     者：Zhiyu Wang Nan Zhang Mingliang Yu Junshan Liu Song Wang Jieshan Qiu Zhiyu Wang;Nan Zhang;Mingliang Yu;Junshan Liu;Song Wang;Jieshan Qiu

作者机构：State Key Lab of Fine ChemicalsLiaoning Key Lab for Energy Materials and Chemical EngineeringPSU-DUT Joint Center for Energy ResearchDalian University of TechnologyDalian 116024LiaoningChina Key Laboratory for Micro/Nano Technology and System of Liaoning ProvinceDalian University of TechnologyDalian 116023LiaoningChina College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China 

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

年 卷 期：2019年第28卷第10期

页      面：183-191页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (NSFC, No. 51522203, 51772040) Fok Ying Tung Education Foundation (No. 151047) the Recruitment Program of Global Youth Experts Xinghai Scholarship of Dalian University of Technology the Fundamental Research Funds for the Central Universities (No. DUT18LAB19) 

主　　题：Lithium sulfide High-capacity cathode Interface MXene Li-S batteries 

摘      要：Use of metallic Li anode raises serious concerns on the safety and operational performance of Li-S batteries due to uncontrolled hazard of Li dendrite formation, which is difficultly eliminated as long as the metallic Li exists in the cells. Pairing lithium sulfide (Li2S) cathode with currently available metallic Lifree high-capacity anodes offers an alternative solution to this challenge. However, the performance of Li2S cathode is primarily restricted by high activation barrier upon initial charge, low active mass utilization and sluggish redox kinetics. Herein, a MXene-induced multifunctional collaborative interface is proposed to afford superb activity towards redox solid-liquid/liquid-liquid phase transformation, strong chemisorption, high conductivity and fast ionic/charge transport in high Li2S loading cathode. Applying collaborative interface effectively reduces initial voltage barrier of Li2S activation and regulates the kinetic behavior of redox polysulfide conversion. Therefore, stable operation of additive-free Li2S cathode with high areal capacities at high Li2S loading up to 9 mg cm^-2 can be achieved with less sacrifice of high capacity and rate capability in Li-S batteries. Rechargeable metallic Li-free batteries are successfully constructed by pairing this high-performance Li2S cathode with high-capacity metal oxide anodes, which delivers superior energy density to current Li-ion batteries.