首页|High-performance localized high-concentration electrolytes by diluent design for long-cycling lithium metal batteries
High-performance localized high-concentration electrolytes by diluent design for long-cycling lithium metal batteries
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Electrolyte design is essential for stabilizing lithium metal anodes and localized high-concentration elec-trolyte(LHCE)is a promising one.However,the state-of-the-art LHCE remains insufficient to ensure long-cycling lithium metal anodes.Herein,regulating the solvation structure of lithium ions in LHCE by weakening the solvating power of diluents is proposed for improving LHCE performance.A diluent,1,1,2,2,3,3,4,4-octafluoro-5-(1,1,2,2-tetrafluoroethoxy)pentane(OFE),with weaker solvating power is in-troduced to increase the proportion of aggregates(an anion interacts with more than two lithium ions,AGG-n)in electrolyte compared with the commonly used 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether(TTE).The decomposition of AGG-n in OFE-based LHCE intensifies the formation of anion-derived solid electrolyte interphase and improves the uniformity of lithium deposition.Lithium metal batteries with OFE-based LHCE deliver a superior lifespan of 190 cycles compared with 90 cycles of TTE-based LHCE under demanding conditions.Furthermore,a pouch cell with OFE-based LHCE delivers a specific en-ergy of 417Wh/kg and undergoes 49 cycles.This work provides guidance for designing high-performance electrolytes for lithium metal batteries.
Lithium metal anodesElectrolyteDiluentsSolid electrolyte interphasePouch cells
College of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China
School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China
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National Key Research and De-velopment ProgramNational Key Research and De-velopment Program北京市自然科学基金河北省科技计划国家自然科学基金国家自然科学基金中国博士后科学基金Beijing Institute of Technology Research Fund Program for Young Scholars
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