Journal
JOURNAL OF POWER SOURCES
Volume 101, Issue 2, Pages 206-212Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0378-7753(01)00671-1
Keywords
graphite; negative electrodes; PVC-carbon coating; irreversible capacity; Li-ion battery
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A carbon-coated graphite is investigated as the negative electrode for Li-ion batteries. The carbon-coated graphite particles are prepared by simple heat-treatment of mixtures, of graphite and poly(vinyl chloride), PVC, at 800-1000 degreesC in an argon flow. The carbon coating reduces significantly the initial irreversible capacity of the graphite in a propylene carbonate-based electrolyte, by suppressing the solvated lithium ion intercalation, and also improves the initial charge-discharge coulombic efficiency. By carbon coating, the specific surface area of graphite particles is greatly increased. These findings can be explained by assuming that a turbostratic structure of PVC-carbon resists irreversible side-reactions which are controlled predominantly by active, edge surface sites. (C) 2001 Elsevier Science B.V. All rights reserved.
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