Patent ID: 7452633
Filing Date: 2008-11-18
Classification: H01M,Y02E

Abstract:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode formed of a graphite powder, where a Lc (112) which is the size of crystallite in a c axis direction which is calculated from a (112) diffraction line of a graphite crystal and determined by a powder X-ray diffraction method is from 4 nm to 30 nm, and a charge capacity at the first cycle which is calculated on the basis of a total weight of a graphite material filled in the battery is 20 to 50 (mAh/g); and a negative electrode formed of a material capable of absorption/desorption of a lithium metal and lithium, wherein said positive electrode and said negative electrode are placed to oppose each other in an electrolyte containing lithium salt; and wherein the graphite powder of said positive electrode has a ratio (A/B) of a specific surface area A which is determined by a nitrogen absorption (BET) method and a surface area B which is determined from an area average diameter which is 20 or less.