Studies of graphite anodes for lithium ion battery
Book
·
OSTI ID:43063
- Tel Aviv Univ. (Israel)
In this paper the authors report on the effects of current density, water content, alcohol additives, graphite type and modification on X, Q{sub IR} and graphite anode degradation rate in DEC-EC-LiAsF{sub 6} solutions. X was found to be inversely proportional to d{sub 002}. {sub IR} increases with graphite surface area and with water and alcohol addition, but decreases with current density. In dry solutions (60 ppm H{sub 2}O) rapid degradation is caused by reduction induced polymerization. This problem was alleviated by the addition of low concentrations of water and alcohols. By modification of the graphite X rose from 0.85--0.9 to 1 and the capacity fading decreased even in dry solutions. In solutions which contained some alcohols and whose solvents were not dried, the graphite demonstrated excellent stability. Capacity fading is attributed to electrolyte degradation. There is some evidence for the increase of order in the graphite after cycling. It was concluded that in order to minimize the degradation rate of the graphite anode a high quality solid electrolyte interphase must be formed prior to lithium intercalation.
- OSTI ID:
- 43063
- Report Number(s):
- CONF-931024--; ISBN 1-56677-033-5
- Country of Publication:
- United States
- Language:
- English
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