Ion-dipole regulation based on bidentate solvent for stabilizing high-voltage lithium metal batteries  

作　　者：Zhengyi Xu Lin Sun Yang Yang Xuejia Li Yuncong Liu Xinxiu Yan Tao Chen 

机构地区：[1]Key Laboratory of General Chemistry of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,Sichuan,China [2]School of Chemistry,Institute of Smart City and Intelligent Transportation,Southwest Jiaotong University,Chengdu 610031,Sichuan,China [3]Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Energy Chemistry》2024年第11期432-440,共9页能源化学（英文版）

基　　金：financially National Natural Science Foundation of China (Grant No. 22209134);Fundamental Research Funds for the Central Universities, Southwest Minzu University (Grant No. ZYN2023003);Sichuan Science and Technology Program (Grant No. 2024NSFSC1155);Fundamental Research Funds for the Central Universities, Southwest Jiaotong University (Grant No. 2682023CX005)。

摘　　要：The poor compatibility of ester electrolytes with lithium metal anode severely limits its use in high voltage lithium metal batteries(LMBs).In this work,a bidentate solvent 1,2-diethoxyethane(DEE) is introduced into ester electrolyte to regulate the ion-dipole interactions to enhance the solubility of LiNO_(3),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 NO_(3)^(-)and PF_6^(-)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 interracial wettability.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 electrolytes is a scalable and effective approach to achieve excellent electrochemical performance of LMBs.

关 键 词：Ion-dipole interactions Solvation structure Solid electrolyte interphase Ester electrolyte Li metal battery 

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