Patent ID: 6835215
Filing Date: 2004-12-28
Classification: C01B,C01P,H01M,Y02E,Y02P,Y02T,Y10T

Abstract:
A non-aqueous secondary battery, made by a method comprising the steps of:laminating electrodes with graphite for a positive electrode and with a lithium group oxide for a negative electrode; and enclosing said electrodes laminated with graphite into a cell vessel with an electrolyte solution, wherein said electrodes laminated with graphite are manufactured by the steps of: pulverizing the graphite to graphite powder having a particle size equal to or smaller than 100 &mgr;m, treating said graphite powder by heating at 900Â° C. or higher, after said pulverizing, the treated graphite powder having a fraction with rhombohedral structure that is equal to or less than 20% by weight, wherein said treating said graphite powder by heating is performed so as to modify crystallinity of the graphite powder such that the fraction of the graphite powder having rhombohedral structure is equal to or less than 20% by weight, and fabricating said graphite electrodes by subjecting the heat-treated graphite powder to pressing.