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Surface film formation on a graphite electrode in Li-ion batteries:: AFM and XPS study
被引:224
作者:
Leroy, S
Blanchard, F
Dedryvère, R
Martinez, H
Carré, B
Lemordant, D
Gonbeau, D
机构:
[1] Univ Pau, LCTPCM, F-64053 Pau, France
[2] Fac Sci Tours, PIMIR, EA 2098, F-37000 Tours, France
关键词:
Li-ion battery;
graphite;
electrode/electrolyte interface;
XPS;
AFM;
D O I:
10.1002/sia.2072
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The formation of a passivation film (solid electrolyte interphase, SEI) at the surface of the negative electrode of full LiCoO2/graphite lithium-ion cells using LiPF6 (1M) in carbonate solvents as electrolyte was investigated by means of x-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The analyses were carried out at different potentials of the first and the fifth cycles, showing the potential-dependent character of the surface-film species formation. These species were mainly identified as Li2CO3 up to 3.8 V and LiF up to 4.2 V. This study shows the formation of the SEI during charging and its partial dissolution during discharge. Copyright (c) 2005 John Wiley & Sons, Ltd.
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页码:773 / 781
页数:9
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