Lithium secondary battery process for making carbonaceous material for a negative electrode of lithium secondary battery
AssigneeKabushiki Kaisha Toshiba
InventorsNorio Takami, Takahisa Ohsaki
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Abstract
A lithium secondary battery which comprises a vessel, a positive electrode, a negative electrode and an electrolyte. Both of the electrodes are placed in the vessel and the vessel is filled with the electrolyte. The negative electrode includes carbonaceous material spherical particles or carbonaceous fibers which absorb and discharge lithium ions. The carbonaceous material has a graphite-like layered structure part and a turbulence-layered structure part. Fine structures of the carbonaceous material spherical particles are arranged in point-orientation.
Claims19
A process for making carbonaceous material for a negative electrode of a lithium secondary battery comprising the step of heat-treating a carbon-containing starting material wherein the starting material is a mesophase small spherical particle or a mesophase pitch fiber, wherein the heat-treating step is a carbonizing step or a graphitizing step conducted in a carbonizing or graphitizing environment, and wherein the environment is an inert gas or a vacuum, at a temperature of 600.degree. C. or above.
Dependencies are inferred from the claim text.