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Citation: TAN Xiao-Lan, CHENG Xin-Qun, MA Yu-Lin, ZUO Peng-Jian, YIN Ge-Ping. Film Formation and Cycleability of LiBOB-Based Electrolyte[J]. Acta Physico-Chimica Sinica, ;2009, 25(10): 1967-1971. doi: 10.3866/PKU.WHXB20090932 shu

Film Formation and Cycleability of LiBOB-Based Electrolyte

1.
College of Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China

Received Date: 9 April 2009
Available Online: 10 August 2009

The formation of solid electrolyte interphase (SEI) filmon graphite in a lithiumbis(oxalato)borate (LiBOB)-based electrolyte was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The effects of SEI filmon the cycleabilities of graphite were examined at roomtemperature (25 ℃) and at high temperature (70 ℃). Results showed that the SEI filmwas formed at around 1.7 V and BOB- ions were reduced to oxalate, which was one of the components of the SEI film. EIS showed that the impedance of the SEI film decreased during the charge/discharge cycle and this was favorable for cycle stability. Whether it was at room temperature or at high temperature, the graphite had better cycleability in the LiBOB-based electrolyte than in the LiPF6-based electrolyte.
- Li-ion battery,
- Electrolyte,
- LiBOB,
- SEI film
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