Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 153, Issue 9, Pages A1708-A1713Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.2218163
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Si/carbon/graphite composites were prepared by mixing submicrometer Si, pitch cokes, and graphite powders followed by heat-treatment. Effects of particle sizes and the mixing method on the cycle performance were examined and the optimized composite structure was investigated by transmission electron microscopy and scanning electron microscopy of the composite electrodes. A surface-coat-type composite prepared by mixing Si with pitch cokes before mixing with graphite powders showed better cycle performances. The particle size (30 mu m) of graphite was also a very important factor in keeping the composite's surface area low, resulting in low irreversible capacity. The downsizing of Si particles was also very effective to have good cycle performances.
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