Combining Experiments and Theoretical Calculations to Investigate the Intercalation Behavior of Bis(trifluoromethanesulfonimide) Anion into Graphite Electrodes from Alkyl Phosphates

被引:8
作者
Zhang, Lei [1 ,2 ]
Wang, Ying [3 ]
Wu, Zhijian [3 ]
Wang, Hongyu [1 ,2 ]
机构
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Electroanalyt Chem, Changchun 130022, Peoples R China
[2] Univ Sci & Technol China, Sch Appl Chem & Engn, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China
基金
中国国家自然科学基金;
关键词
alkyl phosphate; solvated anion; concentrated electrolyte solutions; anion intercalation; dual-ion batteries; INITIO MOLECULAR-DYNAMICS; ELECTROCHEMICAL INTERCALATION;
D O I
10.1021/acsami.1c07222
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In dual-ion batteries (DIBs) utilizing organic electrolyte solutions, the combinations of electrolyte salt and solvent serve as a determiner of the electrochemical performance of graphite electrode partially because solvent participates in the anion intercalation procedure. In this case, every solvated-anion@graphite intercalation compound possesses the characteristic intercalated gallery height. However, in Li/graphite DIBs with concentrated LiTFSI (lithium bis(trifluoromethanesulfonimide))-alkyl phosphates (ca. trimethyl, triethyl, tripropyl, tributyl phosphate) solutions, solvated-TFSI @graphite intercalation compounds have the nearly identical intercalated gallery height of about 0.803 nm, which may be mainly attributed to both the big size of TFSI - anion and the rigid PO4 framework of these alkyl phosphate solvents.
引用
收藏
页码:34197 / 34201
页数:5
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