| abstract |
(57) [Problem] To provide a carbon material for a negative electrode of a lithium secondary battery in which the irreversible capacity in the first cycle is reduced and the discharge capacity is increased, and a lithium secondary battery using the same. SOLUTION: The surface of carbon fine particles constituting a carbon anode of a lithium secondary battery is coated with a silica thin film by performing a silane-silicate treatment by a wet method or a dry method, and an organic electrolyte is directly contacted with the surface of the carbon fine particles. Also, co-intercalation of organic electrolyte and lithium ions into the carbon fine particles is reduced. |