Journal
SOLID STATE IONICS
Volume 178, Issue 3-4, Pages 265-271Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2006.12.014
Keywords
hard carbon spherules; anode; microstructure; interface
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Well-dispersed nanosized hard carbon spherules (nano-HCS) with different hydrogen contents were prepared by a modified hydrothermal method. Their electrochemical behaviors were investigated. The results from Raman spectra and the HRTEM images at different lithiation states show that the microstructure of the nano-HCS with high hydrogen content becomes slightly ordered after several discharging/charging cycles. This disorder-to-order transition phenomenon was not observed in the nano-HCS with low hydrogen content. A mechanism is proposed to interpret this phenomenon. Furthermore, the formation of a thick solid electrolyte interphase (SEI) film on the surface of the nano-HCS is demonstrated and it could be decomposed after charging. (c) 2007 Published by Elsevier B.V.
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