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Surface modification of natural graphite particles for lithiumion batteries

注意：本论文已在Solid State Ionics 135 (2000) 209–212发表
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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 500℃under 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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