Lithium secondary battery and active material for negative electrode in lithium secondary battery
AssigneeNippon Steel Corporation
InventorsKimihito Suzuki, Takeshi Hamada, Taro Kono, Tsutomu Sugiura, Hiromasa Shoji
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Abstract
A lithium secondary battery comprising a positive electrode active material, a negative electrode active material, and a non-aqueous electrolyte is disclosed. The negative electrode active material is a powder of a silicon material containing boron and has a boron content in the range of 0.1-50 wt. %.
Claims20
A negative electrode active material for use in a lithium secondary battery which comprises boron-containing silicon material powder, wherein SiB4 grains are precipitated in individual particles of the boron-containing silicon material powder, and wherein a boron content in the boron-containing silicon material powder is in the range of 0.1-50 wt. %.
A negative electrode active material for use in a lithium secondary battery which comprises a powder of a carbon material and boron-containing silicon material powder, which are mixed together, wherein SiB4 grains are precipitated in individual particles of the boron-containing silicon material powder, and wherein a boron content in the boron-containing silicon material powder is in the range of 0.1-50 wt. %, and wherein the carbon material is one of carbon material containing boron and carbon material containing no boron.
A lithium secondary battery which comprises a positive electrode active material, a negative electrode active material, and a non-aqueous electrolyte, wherein said negative electrode active material comprises boron-containing silicon material powder, wherein SiB4 grains are precipitated in individual particles of the boron-containing silicon material powder, and wherein a boron content in the boron-containing silicon material powder is in the range of 0.1-50 wt. %.
A lithium secondary battery which comprises a positive electrode active material, a negative electrode active material, and a non-aqueous electrolyte, wherein said negative electrode active material comprises a powder of a carbon material and boron-containing silicon material powder, which are mixed together, wherein SiB4 grains are precipitated in individual particles of the boron-containing silicon material powder, and wherein a boron content in the boron-containing silicon material powder is in the range of 0.1-50 wt. %, and wherein the carbon material is one of carbon material containing boron and carbon material containing no boron.
Dependencies are inferred from the claim text.