Nonaqueous electrolyte secondary cell, carbon material for use therein and precursor of said carbon material
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Jan 11, 2007
app pub date -
Aug 5, 2004
filing date -
Sep 9, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
According to the present invention, a nonaqueous electrolyte secondary battery prepared from a carbon material obtained from inexpensive petroleum heavy oil, having a high capacity, and excelling in high-temperature cyclability, the carbon material, and a precursor for the carbon material can be provided. The precursor for the carbon material is obtained from certain petroleum heavy oil by holding the petroleum heavy oil under a pressure of 2.0 MPa or less at a temperature of 400-600.degree. C. for three hours or more. The carbon material is treating the precursor with heat at 800-1,500.degree. C. The nonaqueous electrolyte secondary battery is obtained by using, as a negative electrode active material, a carbon material obtained by further oxidizing said carbon material at 200-1,000.degree. C. in nitrogen, argon, or a mixture thereof containing an oxidizing gas, or in the atmospheric air.
First Claim
Other Claims data not available