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Effect of HF in LiPF6 Based Electrolytes on the Properties of Surface Passivation Films Formed on Graphite Electrodes in Li Secondary Batteries

Published online by Cambridge University Press:  10 February 2011

T. Sato ,
M. Deschamps ,
H. Suzuki ,
H. Ota ,
H. Asahina  and
S. Mori
T. Sato
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
M. Deschamps
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
H. Suzuki
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
H. Ota
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
H. Asahina
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
S. Mori
Affiliation:
Tsukuba Research Center, Mitsubishi Chemical Corporation, 8–3–1, Chuo, Ami, Ibaraki, Japan, [email protected]
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Abstract

The effect of hydrofluoric acid (HF) concentration in conventional LiPF6/EC+DEC electrolyte on the properties of solid electrolyte interphase (SEI) films formed on synthetic graphite electrode and the electrochemical performance were studied using x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), elemental analysis and electrochemical measurement. The morphology and composition of SEI are affected by a small amount of HF in the electrolyte. Higher F content in the SEI was observed when high HF electrolyte were used, although the irreversible capacities used for formation of SEI were nearly the same value. The cycleability of the synthetic graphite electrode was greatly improved when surface film contains larger amount of LiF.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 457
Copyright
Copyright © Materials Research Society 1998

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References

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