首页|Ion-dipole regulation based on bidentate solvent for stabilizing high-voltage lithium metal batteries
Ion-dipole regulation based on bidentate solvent for stabilizing high-voltage lithium metal batteries
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The poor compatibility of ester electrolytes with lithium metal anode severely limits its use in high volt-age lithium metal batteries(LMBs).In this work,a bidentate solvent 1,2-diethoxyethane(DEE)is intro-duced into ester electrolyte to regulate the ion-dipole interactions to enhance the solubility of LiNO3,which enables compatibility with Li anode and maintains the high voltage cathode stability.In the designed electrolyte,the steric effect of DEE facilitates the participation of NO3-and PF6 anions in the Li+solvation structure,thus promoting the generation of inorganic-rich solid electrolyte interphase(SEI).And the low viscosity of DEE also ensures that the ester electrolyte poses good interfacial wettabil-ity.As a result,our designed electrolyte enables the high-loading Li||NCM622 and Li||NCM811(～3 mA h cm-2)full cells to achieve stable cycling over 200 cycles,8 times longer than that of a conventional ester electrolyte.This work suggests that regulation of intermolecular interactions in conventional ester elec-trolytes is a scalable and effective approach to achieve excellent electrochemical performance of LMBs.
Ion-dipole interactionsSolvation structureSolid electrolyte interphaseEster electrolyteLi metal battery
Key Laboratory of General Chemistry of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,Sichuan,China
Department of Chemistry,Tsinghua University,Beijing 100084,China
School of Chemistry,Institute of Smart City and Intelligent Transportation,Southwest Jiaotong University,Chengdu 610031,Sichuan,China
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