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Surface modification of natural graphite particles for lithiumion batteries

ע⣺ՓSolid State Ionics 135 (2000) 209C212l
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T. Tsumura1, A. Katanosak1 , I. Souma1 , T. Ono2, Y. Aihara2 , J. Kuratomi2 ,M. Inagaki3
1.NARD Institute, 2 -6 -1, Nishinagasu-cho, Amagasaki 660 -0805, Japan
2.Yuasa Corporation, 4 -5 -1, Ohgi-cho, Odawara Kanagawa 250 -0001, Japan
3. Aichi University of Technology, 1247, Yachigusa, Yachigusa-cho Toyota 470 -0392, Japan

Abstract:The surface of natural graphite particles for the anode of dry-type polymer lithium ion batteries was modified by means of carbon coating and polyethyleneoxide (PEO) grafting. Carbon coating on graphite particles was achieved by a simple mixing of graphite particles with polyvinylchloride powders and heating up to 500under a nitrogen gas flow. The graphite particles obtained were coated with carbon homogeneously. The carbon layer was oxidized by heating at 400 in static air to form carboxyl group and then PEO was grafted by esterification of the carboxyl group with terminal hydroxyl group of PEO. The dispersibility of the PEO-grafted particles in water was improved compared to that of untreated graphite particles.
Keywords: Surface; Modification; Coating; Grafting; Dry-type polymer lithium ion battery; Materials: Graphite; Polyvinylchloride; Polyethyleneoxide

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