Advanced carbon anode materials for lithium ion cells

Three kinds of carbon have been used for commercial cells: graphite, soft carbon and hard carbon. The difference in the structures of these three kinds of carbon is shown clearly using our new model for soft and hard carbon structure. The lithium-doped state of these three kinds of carbon is discuss...

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Bibliographic Details
Published in:Journal of power sources 1999-09, Vol.81, p.1-7
Main Authors: Azuma, Hideto, Imoto, Hiroshi, Yamada, Shin'ichiro, Sekai, Koji
Format: Article
Language:English
Subjects:
Anode
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Graphite
Hard carbon
Lithium-ion cell
Soft carbon
Structural analysis
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Summary:Three kinds of carbon have been used for commercial cells: graphite, soft carbon and hard carbon. The difference in the structures of these three kinds of carbon is shown clearly using our new model for soft and hard carbon structure. The lithium-doped state of these three kinds of carbon is discussed using the new structural model and published 7 Li NMR data. A large reversible capacity is demonstrated in the hard carbons derived from some vegetable fibers. Two mechanisms—one enhancing the adsorbing force of pseudo-metallic lithium atoms and one reducing the repulsion force between doped lithium atoms—which together produce a high reversible capacity, are explained.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(99)00122-6