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AssigneeHitachi Chemical Company, Ltd.
InventorsYoshito Ishii, Souichirou Suda, Tatsuya Nishida
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A negative electrode for a lithium secondary battery includes a layer of a mixture containing graphite powder and an organic binder on a current collector, wherein a diffraction intensity ratio (002)/(110) measured by X-ray diffractometry of the layer of a mixture is 500 or less. A lithium secondary battery includes the negative electrode for a lithium secondary battery, and a positive electrode that includes a lithium compound. This results in less deterioration in the rapid charge and discharge characteristics and the cycle characteristics when the density of the negative electrode is made higher, thereby providing a high capacity lithium secondary battery having the improved energy density per unit volume of the secondary battery.
A negative electrode for a lithium secondary battery comprising:
A graphite powder comprising graphite particles having an average particle diameter in a range of 1 to 100 μm, a crystallite size Lc (002) in a C-axis direction of a crystal of at least 1000 Å, a specific surface area of at most 8 m2/g, and an aspect ratio of at most 5, wherein an interlayer distance, d (002), of a crystal of the graphite powder is 3.36 Å or less and a diffraction intensity ratio (002)/(110) measured by X-ray diffractometry of a layer of a mixture of the graphite powder and a binder is at most 500 when a density of the layer is in a range of 1.5 to 1.95 g/cm3.
Dependencies are inferred from the claim text.