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 

机构地区：[1]ianjin Key Laboratory of Advanced Functional Porous Materials,Institute for New Energy Materials and Low-Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin,300384 China

出　　处：《Chinese Journal of Chemistry》2021年第10期2801-2807,共7页中国化学（英文版）

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.

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.

关 键 词：Methyl butyrate Solvent effects ALLOYS Low temperature LITHIUM 

分 类 号：TM91[电气工程—电力电子与电力传动]