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Acta Physico-Chimica Sinica  2009, Vol. 25 Issue (10): 1967-1971    DOI: 10.3866/PKU.WHXB20090932
Article     
Film Formation and Cycleability of LiBOB-Based Electrolyte
TAN Xiao-Lan, CHENG Xin-Qun, MA Yu-Lin, ZUO Peng-Jian, YIN Ge-Ping
College of Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
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Abstract  

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.



Key wordsLi-ion battery      Electrolyte      LiBOB      SEI film     
Received: 09 April 2009      Published: 10 August 2009
MSC2000:  O646  
Corresponding Authors: YIN Ge-Ping     E-mail: yingphit@hit.edu.cn
Cite this article:

TAN Xiao-Lan, CHENG Xin-Qun, MA Yu-Lin, ZUO Peng-Jian, YIN Ge-Ping. Film Formation and Cycleability of LiBOB-Based Electrolyte. Acta Physico-Chimica Sinica, 2009, 25(10): 1967-1971.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20090932     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2009/V25/I10/1967

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