Patent ID: 6287729
Filing Date: 2001-09-11
Classification: H01M,Y02E

Abstract:
Graphite materials for a negative electrode used in a lithium secondary battery which graphite materials have an average specific surface area in the range of 1.5 m.sup.2 /gram to 5 m.sup.2 /gram and comprise (A) milled graphite fibers which are produced by milling and graphitizing mesophase pitch-based carbon fibers, and which have an interplanar spacing of the graphite layer (d.sub.002) of at most 0.337 nm and a specific surface area in the range of 0.8 m.sup.2 /gram to 1.3 m.sup.2 /gram; and (B) graphite materials which have an interplanar spacing of the graphite layer (d.sub.002) of at most 0.336 nm, a degree of graphitization (P.sub.101 /P.sub.100) of at least 2.0 and a specific surface area in the range of 2 m.sup.2 /gram to 15 m.sup.2 /gram, wherein the components (A) and (B) are mixed at a ratio (A) (B) by weight within the range of 90/10 to 50/50.