Hierarchical intercalation of tetrafluoroborate anion into graphite electrode from sulfolane  

作　　者：Yunju Wang Hongyu Wang 

机构地区：[1]State Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,Jilin,China [2]School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China

出　　处：《Journal of Energy Chemistry》2022年第12期378-382,I0010,共6页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China,China(21975251)。

摘　　要：The anion storage behavior of graphite positive electrode in a dual-ion battery is closely related to the solvation of anion in the corresponding electrolyte solution.The classical electrolyte solutions of Li BF_(4)^(-)sulfolane(SL)have long been recognized in the community of lithium batteries and still appear promising in dual-ion batteries.Nevertheless,the solvation of BF_(4)^(-)by SL has seldom been addressed before.In this study,the solvation states of SL-BF_(4)^(-)are adjusted by varying LiBF_(4)concentration or introducing auxiliary salts of LiPF_6or SBPBF_(4)(SBP:spiro-(1,1')-bipyrrolidinium)in the electrolyte solutions of Li/graphite dualion cells.The electrochemical storage processes of SL-BF_(4)^(-)anions in graphite electrodes are investigated through in situ X-ray diffraction measurements.Two kinds of graphite intercalation compounds(GICs)with contrastive intercalation gallery heights(IGHs)have been discovered,which are ascribed to the storage of different kinds of SL-BF_(4)^(-)anions in graphite electrode.The interactions between ions and SL in the electrolyte solutions are characterized by Fourier transform infrared spectroscopy and then correlated with the performance of Li/graphite cells.

关 键 词：Dual-ion batteries Lithium tetrafluoroborate SULFOLANE In situ XRD Highly concentrated solutions 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.5[理学—物理化学]