A novel mixture of lithium bis(oxalato) borate, gamma-butyrolactone and non-flammable hydrofluoroether as a safe electrolyte for advanced lithium ion batteries

作者：Shi, Pei; Fang, Shaohua^*; Huang, Jun; Luo, Dong; Yang, Li^*; Hirano, Shin-ichi

来源：Journal of Materials Chemistry A, 2017, 5(37): 19982-19990.

DOI：10.1039/c7ta05743a

• LOW-TEMPERATURE PERFORMANCE
• METHYL-NONAFLUOROBUTYL ETHER
• LIBOB-BASED ELECTROLYTES
• ELECTROCHEMICAL PERFORMANCES
• PROPYLENE CARBONATE
• LIQUID ELECTROLYTES
• METAL BATTERIES
• CONDUCTIVITY
• CELLS
• STABILITY

In this work, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (F-EPE), a kind of non-flammable hydrofluoroether, was initially mixed with lithium bis(oxalato) borate (LiBOB) and gamma-butyrolactone (GBL) to formulate a safe electrolyte for lithium-ion batteries. It was found that the addition of F-EPE endowed this novel electrolyte with a high safety level, low surface tension and good wettability to the separator and electrodes. More importantly, this safe electrolyte supported the graphite/LiCo1/3Mn1/3Ni1/3O2 full cell in achieving excellent electrochemical performances. During the prolonged cycle test at room temperature, its capacity retention after 500 cycles could reach 80.6%, which was comparable to that of a commercial electrolyte. Its rate performance at room temperature and cycle performance at elevated temperature (60 degrees C) surpassed those of the commercial electrolyte. In particular, its low-temperature performance was remarkable, and the cell could deliver a capacity as high as 74.2 mA h g(-1) at -40 degrees C. In view of these results, such a safe electrolyte showed tremendous potential for practical application.

• 出版日期2017-10-7
• 单位上海交通大学