Tuning a Solvation Structure of Lithium Ions Coordinated with Nitrate Anions through Ionic Liquid-Based Solvent for Highly Stable Lithium Metal Batteries

Gaoxu Huang; Yaqi Liao; Xianming ZhaoXiaopan JinZhipeng ZhuMengjia GuanYongsheng Li

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Tuning a Solvation Structure of Lithium Ions Coordinated with Nitrate Anions through Ionic Liquid-Based Solvent for Highly Stable Lithium Metal Batteries

机译：Tuning a Solvation Structure of Lithium Ions Coordinated with Nitrate Anions through Ionic Liquid-Based Solvent for Highly Stable Lithium Metal Batteries

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Rational design of promising electrolyte is considered as an effective strategyto improve the cycling stability of lithium metal batteries (LMBs). Here,an elaborately designed ionic liquid-based electrolyte is proposed that iscomposed of lithium bis(trifluoromethanesulfonyl)imide as the lithiumsalt, 1-ethyl-3-methylimidazolium nitrate ionic liquid ([EMIm][NO_3] IL) andfluoroethylene carbonate (FEC) as the functional solvents, and 1,2-dimethoxyethane(DME) as the diluent solvent. Using [EMIm][NO_3] IL as the solventcomponent facilitates a special Li~+-coordinated NO_3~? solvation structure,which enables the continues electrochemical reduction of solvated NO_3~? andthe formation of remarkably stable and conductive solid electrolyte interface.With FEC as another functional solvent and DME as the diluent solvent,the formulated electrolyte delivers high oxidative stability and ionic conductivity,and endows improved electrochemical reaction kinetics. Therefore,the formulated electrolyte demonstrates exceedingly reversible andstable Li stripping/plating behavior with high average Coulombic efficiency(98.8%) and ultralong cycling stability (3500 h). Notably, the high-voltageLi|LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 full cell with IL-based electrolyte exhibits enhancedcyclability with a capacity retention of 65% after 200 cycles under harsh conditionsof low negative/positive ratio (3.1) and lean electrolyte (2.5 μL mg~(?1)).This study creates the first NO_3~--based ionic liquid electrolyte and evokes theavenue for practical high-voltage LMBs.

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《Advanced functional materials》 |2023年第6期|2211364.1-2211364.13|共13页
作者
Gaoxu Huang; Yaqi Liao; Xianming ZhaoXiaopan JinZhipeng ZhuMengjia GuanYongsheng Li;
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作者单位

Lab of Low-Dimensional Materials Chemistry Key Laboratory for Ultrafine Materials of Ministry of Education Frontier Science Center of the Materials Biology and Dynamic Chemistry Shanghai Engineering Research Center of Hierarchical Nanomaterials School of;

State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074, China;

Shanghai Electro-Mechanical Engineering Institute Shanghai 201109, China;

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dendrite-free; electrolyte formulations; ionic liquids; lithium metal anodes; SEI layers;

Tuning a Solvation Structure of Lithium Ions Coordinated with Nitrate Anions through Ionic Liquid-Based Solvent for Highly Stable Lithium Metal Batteries

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