Active material for negative electrode used in lithium-ion battery and method of manufacturing same
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United States of America Patent
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Jul 22, 2003
Grant Date -
Jun 20, 2002
app pub date -
Aug 6, 2001
filing date -
Apr 2, 1998
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Abstract
Disclosed is negative electrode active material for lithium ion batteries and a method for manufacturing the same. The active material includes a crystalline carbon core; and an amorphous or turbostratic carbon shell evenly covering the crystalline carbon core, the carbon shell having a thickness of 10-2000 .ANG.. The method includes the steps of chemically combining a crystalline carbon and an amorphous carbon precursor; removing remaining amorphous carbon precursor not reacted in the chemical combination; and heat-treating a chemical combination material of graphite and the amorphous carbon precursor obtained in the chemical combination.
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