Material for negative electrode of non-aqueous electrolyte secondary battery, process for producing the same, negative electrode and battery
AssigneeKureha Corporation
InventorsNaohiro Sonobe, Hiroshi Ohta, Takahiro Akita
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Abstract
A negative electrode material for non-aqueous electrolyte secondary batteries, comprises: a carbon material having a sphericity of at least 0.8, and exhibiting an average (002) interlayer spacing d002 of 0.365-0.400 nm, a crystallite size in a c-axis direction Lc(002) of 1.0-3.0 nm, as measured by X-ray diffractometry, a hydrogen-to-carbon atomic ratio (H/C) of at most 0.1 as measured by elementary analysis, and an average particle size Dv50 of 1-20 μm. The negative electrode material is spherical and exhibits excellent performances including high output performance and durability.
Claims10
A negative electrode material for non-aqueous electrolyte secondary batteries, comprising:
- a carbon material having a sphericity of at least 0.8, and exhibiting an average (002) interlayer spacing d002 of 0.365-0.400 nm, a crystallite size in a c-axis direction LC(002) of 1.0-3.0 nm, as measured by X-ray diffractometry, a hydrogen-to-carbon atomic ratio (H/C) of at most 0.1 as measured by elementary analysis, and an average particle size Dv50 (μm) of 1-20 μm, and nitrogen in an amount of 0.5-5 wt %;
- wherein the carbon material further exhibits a specific surface area S (m2/g) giving a product S×Dv50 of 3-40 and the negative electrode material has a ratio D4/D1 of at most 3.0 between a weight-average particle size D4 and a length average particle size D1.
A negative electrode material for non-aqueous electrolyte secondary batteries, comprising:
- a carbon material having a sphericity of at least 0.8, and exhibiting an average (002) interlayer spacing d002 of 0.365-0.400 nm, a crystallite size in a c-axis direction LC(002) of 1.0-3.0 nm, as measured by X-ray diffractometry, a hydrogen-to-carbon atomic ratio (H/C) of at most 0.1 as measured by elementary analysis, and an average particle size Dv50 (μm) of 1-20 μm, and nitrogen in an amount of 0.5-5 wt %;
- wherein the carbon material is a carbonization product of a vinyl resin and the negative electrode material has a ratio D4/D1 of at most 3.0 between a weight-average particle size D4 and a length average particle size D1.
A negative electrode material for non-aqueous electrolyte secondary batteries, comprising:
- a carbon material having a sphericity of at least 0.8, and exhibiting an average (002) interlayer spacing d002 of 0.365-0.400 nm, a crystallite size in a c-axis direction Lc(002) of 1.0-3.0 nm, as measured by X-ray diffractometry, a hydrogen-to-carbon atomic ratio (H/C) of at most 0.1 as measured by elementary analysis, and an average particle size Dv50 of 1-20 μm;
- wherein the carbon material further exhibits a nitrogen content of 0.5-5 wt. % and the negative electrode material has a ratio D4/D1 of at most 3.0 between a weight-average particle size D4 and a length average particle size D1.
Dependencies are inferred from the claim text.