Composite carbon particle and lithium-ion secondary cell using same
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United States of America Patent
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Apr 4, 2017
Grant Date -
Sep 24, 2015
app pub date -
Oct 11, 2013
filing date -
Oct 12, 2012
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Abstract
A composite carbon particle for use in a negative electrode of a lithium-ion secondary battery, the composite carbon particle including a core particle composed of a carbon material obtained by heating, at not higher than 2500° C., petroleum coke having a Hardgrove grindability index (HGI value) of 30 to 60 (defined by ASTM D409), and a covering layer composed of a carbonaceous material obtained by heating an organic compound at 1000° C. to 2000° C. The composite carbon particle has a 50% particle diameter (D50) of 1 μm to 30 μm in a volume-based cumulative particle size distribution as measured by a laser diffraction method.
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