Patent ID: 7052803
Filing Date: 2006-05-30
Classification: H01M,Y02E

Abstract:
1. A lithium rechargeable battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein said negative electrode comprises a copper core material and a negative electrode material mixture layer fixed on said core material, said negative electrode material mixture layer includes an active material comprising a mixture of artificial graphite particles A and spherical graphite particles B, said artificial graphite particles A are isotropic artificial graphite particles including graphite structure oriented at random and having: (1) an interplanar spacing d (2) a ratio I (3) a mean circularity of the particles being 0.85 to 0.95; (4) a particle diameter D (5) a tap density after tapping of 900 times with a stroke length of 18 mm being not less than 1 g/cm (6) a specific surface area measured by a BET method being not more than 1 m said spherical graphite particles B having: (1) a mean circularity of the particles being 0.88 to 1; (2) a particle diameter D50 corresponding to a volume fraction of 50% measured by a laser diffraction particle size distribution analyzer being 5 to 15 μm; (3) an interplanar spacing d002 between the (002) planes obtained by a powder X-ray diffraction method being not more than 3.357 Å; and (4) a specific surface area measured by a BET method being not more than 8 m