期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 25, 期 7, 页码 2260-2265出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(15)63839-0
关键词
lithium iron phosphate-based batteries; lithium salts; LiBF4-LiBOB; LiTFSI-LiBOB; wide temperature range
资金
- Teacher Research Fund of Central South University, China [2013JSJJ027]
To achieve good performance for LiFePO4-based batteries operated at a wide temperature range, mixed salts of LiBF4-LiBOB (lithium bis(oxalato)borate) and LiTFSI (lithium bis(trifluoromethanesulfonyl)imide)-LiBOB were investigated as alternative lithium salts to LiPF6 in non-aqueous electrolytes. LiFePO4/Li half cells using LiPF6, LiBF4-LiBOB and LiTFSI-LiBOB slats as lithium salts were investigated by galvanostatic cycling, cyclic voltammetry, thermogravimetric analysis. The results show that LiBF4-LiBOB and LiTFSI-LiBOB mixed salts are much more thermally stable than LiPF6. Corrosion of Al foil in the LiTFSI-based electrolytes can be suppressed successfully by the addition of LiBOB as a co-salt. The electrochemical performance of LiBF4-LiBOB and LiTFSI-LiBOB mixed salts based cells are both better than that of LiPF6-based cell. LiTFSI-LiBOB mixed salt based electrolyte is considered to be a very promising electrolyte candidate for Li-ion batteries that will be used in wide-temperature applications.
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