Negative electrode material for lithium secondary cell,...

Details Negative electrode material for lithium secondary cell,... Negative electrode material for lithium secondary cell,...

H - Electricity

01

M

H01M 4/24 (2006.01) H01M 4/26 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2136538

- 23 - ABSTRACT A negative electrode material for a lithium secondary cell, which consists of carbonaceous particles composed primarily of carbon fiber particles prepared by pulverizing pitch-based carbon fibers, wherein the carbon fiber particles have a layer spacing d between the carbon layers of 0.338 nm or less and an average particle size of 5-200 µm, as well as a lithium secondary battery which employs such a negative electrode. Carbon fiber particles with the above-mentioned degree of graphitization and average particle size are prepared by firing pitch fibers at 800-2600°C to make carbon fibers, and then pulverizing them and firing the resulting pulverized carbon fiber particles again at a temperature higher than the pre-pulverization firing temperature.

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