Journal
SOLID STATE IONICS
Volume 178, Issue 1-2, Pages 137-144Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2006.10.025
Keywords
hard carbon; catalytic graphitization; X-ray diffraction; intercalation reactions; anode material; lithium-ion cell
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Glass-like carbon spheres produced by activated carbonization of phenol resin in CO2 atmosphere demonstrated an XRD pattern typical for disordered carbons. This material was entirely useless as anode for lithium-ion cell because of both its extremely low discharge capacity (27 mAh/g) and cyclic reversibility for the first cycle (39%). Heat treatment of the original carbon at temperature 2700 degrees C appeared to be ineffective for obtaining graphite material. The product of such a treatment yielded discharge capacity of 74 mAh/g, which remained at an unacceptably low level. A simple heat treatment of disordered carbon with iron powder at relatively low temperature of 1000 degrees C allowed us to improve electrochemical behaviour of the carbon. Due to a partial transformation of glass-like carbon into graphite, discharge capacity increased to about 250 mA/g. (c) 2006 Elsevier B.V. All rights reserved.
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