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Citation: GAO Hong-Quan, LAI Yan-Qing, ZHANG Zhi-An, LIU Ye-Xiang. Electrochemical Behaviors of New Lithium Salt LiBC₂O₄F₂ in EC+DMC Solvents[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 905-910. doi: 10.3866/PKU.WHXB20090503 shu

Electrochemical Behaviors of New Lithium Salt LiBC₂O₄F₂ in EC+DMC Solvents

1.
School of Metallurgical Science and Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 20 November 2008
Available Online: 3 March 2009

The thermal stability of lithium difluoro(axalato)borate (LiODFB) was analyzed by thermal gravimetric-differential thermal analysis (TG-DTA). The electrochemical performance and interfacial characteristics of the LiODFB/ethylene carbonate (EC)+dimethyl carbonate (DMC) electrolyte were studied by constant current charge-discharge and electrochemical impedance spectroscopy (EIS). Results show that LiODFB has higher thermal stability and that the lithium-ion cells using LiODFB salt in EC+DMC solvents exhibit excellent electrochemical performances. Compared with the LiPF6/EC+DMC electrolyte, the lithium-ion cells using LiODFB-based electrolyte have very od capacity retention at 55 ℃. At 0.5C and 1C (1C=250 mA·g-1) discharge rates, the difference between the rate capability of the two cells is tiny. LiODFB is reduced at about 1.5 V (vs Li/Li+) and forms a robust protective solid electrolyte interphase (SEI) film on the graphite surface. EIS tests show that these lithium-ion batteries which use the LiODFB-based electrolyte have a slightly higher interfacial impedance. Therefore, as a new salt, LiODFB is a promising alternative lithium salt for the replacement of LiPF6 in lithiumion battery electrolytes.
- Lithium-ion battery,
- Electrolyte,
- Lithiumdifluoro(axalato)borate,
- Electrochemical
  performance,
- Interfacial property
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沈阳化工大学材料科学与工程学院沈阳 110142

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Electrochemical Behaviors of New Lithium Salt LiBC₂O₄F₂ in EC+DMC Solvents