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

Journal of Energy Chemistry 2023年第7期82卷 287-295,I0007页

作者： Xianshu Wang Junru Wu Yun Zhao Bin Li Naser Tavajohi Qi Liu Jianguo Duan Ding Wang Peng Dong Yingjie Zhang Baohua Li National and Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055GuangdongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China School of Chemistry and Materials Engineering Huizhou UniversityHuizhou 516007GuangdongChina Department of Chemistry UmeåUniversityUmeå90187Sweden College of Materials Science and Engineering Hunan UniversityChangsha 410082HunanChina

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 ***,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 *** 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 ***,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

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