Active negative material for lithium secondary battery, method of preparing the same and lithium secondary battery using the same
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United States of America Patent
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May 4, 2004
Grant Date -
Apr 4, 2002
app pub date -
Mar 10, 1999
filing date -
Mar 10, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A negative active material for a lithium secondary battery includes a graphite-like carbon material having an intensity ratio I(110)/I(002) of an X-ray diffraction peak intensity I(002) at a (002) plane to an X-ray diffraction peak intensity I(110) at a (110) plane of less than 0.2. The negative active material prepared by dissolving a coar tar pitch or a petroleum pitch in an organic solvent to remove insoluble components therefrom, heat-treating the pitch at a temperature in the range of 400 to 450.degree. C. for 4 hours or more under an inert atmosphere to thereby produce at least 50 weight percent of mesophase particles based on the pitch, coking the pitch including mesophase particles, carbonizing the coked pitch, pulverizing the carbonized pitch; and graphitizing the pulverized pitch.
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- 1 Citation Count
- H01M Class
- 2.22 % this patent is cited more than
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