A hard carbon/microcrystalline graphite/carbon composite with a core-shell structure as novel anode materials for lithium-ion batteries

Hard carbon and microcrystalline graphite (MG) core-shell structured composite materials are prepared, and their electrochemical performances as an anode material for lithium-ion batteries are reported. The composite materials are obtained by coating a mixture of MG and pitch onto hard carbon partic...

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Bibliographic Details
Published in:Electrochimica acta 2014-07, Vol.135, p.27-34
Main Authors: Kim, Kyung-Jin, Lee, Taek-Soo, Kim, Hyung-Giun, Lim, Sung-Hwan, Lee, Sung-Man
Format: Article
Language:English
Subjects:
Anode material
Anodes
Carbon
Coating
Composite materials
Graphite
Hard carbon
Lithium ion battery
Lithium-ion batteries
Microcrystalline graphite
Nanostructure
Particle morphology
Particulate composites
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Summary:Hard carbon and microcrystalline graphite (MG) core-shell structured composite materials are prepared, and their electrochemical performances as an anode material for lithium-ion batteries are reported. The composite materials are obtained by coating a mixture of MG and pitch onto hard carbon particles, followed by heating at 1200°C under an argon atmosphere for 1h. The surface of the hard carbon is subsequently covered with a layer of the MG/pitch carbon composite. In the coating layer of the MG/pitch carbon composite, the MG particles are divided into nanoscale graphite sheets, and uniformly dispersed within the pitch of carbon matrix. The composite particles have a rounded shape, especially when the content of MG increases, which can improve their packing density compared to hard carbon having sharp edges. Anodes prepared from these composite materials exhibit enhanced electrochemical performances, including a high reversible capacity, high initial coulombic efficiency, high charging/discharging rate capability, and desirable cycling stability.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2014.04.171