Non-solvating fluorosulfonyl carboxylate enables temperature-tolerant lithium metal batteries  

作　　者：Xianshu Wang Junru Wu Yun Zhao Bin Li Naser Tavajohi Qi Liu Jianguo Duan Ding Wang Peng Dong Yingjie Zhang Baohua Li 

机构地区：[1]National and Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology,Key Laboratory of Advanced Battery Materials of Yunnan Province,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China [2]Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,Guangdong,China [3]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [4]School of Chemistry and Materials Engineering,Huizhou University,Huizhou 516007,Guangdong,China [5]Department of Chemistry,UmeåUniversity,Umeå90187,Sweden [6]College of Materials Science and Engineering,Hunan University,Changsha 410082,Hunan,China

出　　处：《Journal of Energy Chemistry》2023年第7期287-295,I0007,共10页能源化学（英文版）

基　　金：the support from the Key-Area Research and Development Program of Guangdong Province (2020B090919003);the Yunnan Major Scientific and Technological Projects (202202AG050003);the Natural Science Foundation of China (22202078, 51904135,52162030);the Department of Education of Guangdong Province(2020KQNCX082);the Applied Basic Research Foundation of Yunnan Province (202103AA080019);the National Key R&D Program of China (2018YFB01040);the support of the supported by the Testing Technology Center of Materials and Devices of Tsinghua Shenzhen International Graduate School (SIGS)

摘　　要：Advanced electrolyte engineering is an important strategy for developing high-efficacy lithium(Li)metal batteries(LMBs).Unfortunately,the current electrolytes limit the scope for creating batteries that perform well over temperature ranges.Here,we present a new electrolyte design that uses fluorosulfonyl carboxylate as a non-solvating solvent to form difluoroxalate borate(DFOB-)anion-rich solvation sheath,to realize high-performance working of temperature-tolerant LMBs.With this optimized electrolyte,favorable SEI and CEI chemistries on Li metal anode and nickel-rich cathode are achieved,respectively,leading to fast Li^(+)transfer kinetics,dendrite-free Li deposition and suppressed electrolyte deterioration.Therefore,Li||LiNi_(0.80)Co_(0.15)Al_(0.05)O_(2)batteries with a thin Li foil(50μm)show a long-term cycling lifespan over 400 cycles at 1C and a superior capacity retention of 90%after 200 cycles at 0.5C under 25℃.Moreover,this electrolyte extends the operating temperature from-10 to 30℃and significantly improve the capacity retention and Coulombic efficiency of batteries are improved at high temperature(60℃).Fluorosulfonyl carboxylates thus have considerable potential for use in high-performance and allweather LMBs,which broadens the new exploring of electrolyte design.

关 键 词：Lithium metal batteries Methyl fluorosulfonyldifluoroacetate Non-solvating Anion-rich solvation Temperature tolerance 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.1[理学—物理化学]