Negative electrode material for lithium secondary cell, method for its production, and lithium secondary cell
AssigneeNippon Steel Corporation
InventorsTakashi Iijima, Kimihito Suzuki, Maki Sato
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Abstract
A negative electrode material for a lithium secondary cell comprises carbonaceous particles consisting essentially of carbon fiber particles prepared by pulverizing pitch-based carbon fibers, wherein the layer spacing d between the carbon layers is less than 0.338 nm, the average particle size is 5-200 .mu.m, the fiber diameter of the pitch-based carbon fibers is 5-30 .mu.m, and the aspect ratio of the carbon fiber particles is 100 or less, the layer spacing d determined based on X-ray diffraction of the carbon fiber particles. A lithium secondary cell contains such a negative electrode material.
Claims4
A negative electrode material for a lithium secondary cell, which comprises carbonaceous particles consisting essentially of carbon fibers prepared by pulverizing pitch-based carbon fibers, wherein the layer spacing d between the carbon layers, as determined by X-ray diffraction, is less than 0.338 nm, the average particle size is 5-200 .mu.m, the fiber diameter of said pitch-based carbon fibers is 5-30 .mu.m, and the aspect ratio of said carbon fibers is greater than 1 to 100.
A lithium secondary cell, which comprises a compartment which contains a positive electrode, a negative electrode and an electrolyte containing a lithium salt, between the positive and negative electrodes, wherein said negative electrode comprises carbon fibers prepared by pulverizing pitch-based carbon fibers, and wherein the layer spacing d between the carbon layers, as determined by x-ray diffraction, is less than 0,338 nm, the average particle size is 5-200 .mu.m, the fiber diameter of said pitch-based carbon fiber is 5-30 .mu.m, and the aspect ratio of said carbon fibers is greater than 1 to 100.
Dependencies are inferred from the claim text.