Reversible Low Temperature Li-Storage in Liquid Metal Based Anodes via a Co-Solvent Strategy

作     者：Mengdi Zhang Xiaofeng Lei Yang Lv Xizheng Liu Yi Ding Mengdi Zhang;Xiaofeng Lei;Yang Lv;Xizheng Liu;Yi Ding

作者机构：ianjin Key Laboratory of Advanced Functional Porous MaterialsInstitute for New Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin300384 China 

出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)

年 卷 期：2021年第39卷第10期

页      面：2801-2807页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0703[理学-化学] 

基　　金：supported by the National Key Research and Development Program of China(2018YFE0124500 and 2019YFA0705700) the National Natural Science Fund for Distinguished Young Scholars(51825102) the National Natural Science Foundation of China(U1804255) open funding of Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education,Harbin Engineering University. 

主　　题：Methyl butyrate Solvent effects Alloys Low temperature Lithium 

摘      要：Main observation and conclusion The application of lithium-ion batteries in cold climates has been hindered due to the decline in performance at low temperatures.The increased de-solvation energy and formation of Li dendrites at the anode surface emerge as the major challenges,which rely on the development of stable anode and compatible electrolytes.Herein,a self-healing GaInSn liquid metal(LM)based electrode coupled with a multi-solvent electrolyte is proposed toward reversible Li-storage at low temperatures.By using methyl butyrate(MB)as a co-solvent in 1 mol·L^(–1)LiTFSI of ethylene carbonate and diethyl carbonate,the electrolyte viscosity decreases from 52.07 to 13.75 mPa·s,while the ionic conductivity increases from 1.38 to 3.44 mS·cm^(–1)at–20°C.Moreover,the Li/MXene@LM cells can display a discharge capacity of 500 mAh·g^(–1),with capacity retention of 78%at–20°C after 120 cycles.It is disclosed that a uniform LiF-rich solid electrolyte interface(SEI)layer on the anode is formed upon the addition of MB,which promotes the desolvation of Li ions at the interface of electrode/electrolyte especially at low temperatures.These results prove that MB as the co-solvent is well compatible with LM based anodes and holds great potential for the exploration of low-temperature energy devices.