| abstract |
(57) [Summary] [Purpose] To obtain a negative electrode material of a lithium secondary battery having a large discharge capacity. [Structure] A carbonizable material is used in an inert atmosphere at a pressure of 10 kgf / cm 2 or more (for example, 20 to 300 kgf). / Cm 2 ) and a heat treatment temperature of 600 ° C. or less (for example, about 200 to 500 ° C.), and then 500 to A carbon material is obtained by carbonizing at a temperature of about 3300 ° C. When the carbonizable material is a graphitizable material, it is carbonized at about 1500 to 3300 ° C, and when it is a non-graphitizable material, it is carbonized at about 500 to 1500 ° C. The obtained carbon material is suitable as a negative electrode material for lithium secondary batteries. |