NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE SAME
First Claim
1. A negative electrode material for nonaqueous electrolyte secondary battery, comprising the following carbon material A and carbon material B:
- (Carbon material A)a multilayer-structure carbon material containing a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, which is a carbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å
or less, Lc is 900 Å
or more, the tap density is 0.8 g/cm3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm−
1 to the peak intensity near 1,580 cm−
1 in the argon ion laser Raman spectrum, is from 0.25 to 0.6,(Carbon Material B)a graphitic particle where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å
or less, Lc is 900 Å
or more, the tap density is 0.8 g/cm3 or more, the Raman R value that is a ratio of the peak intensity near 1,360 cm−
1 to the peak intensity near 1,580 cm−
1 in the argon ion laser Raman spectrum, is from 0.2 to 0.5, and the average degree of circularity as determined by a flow-type particle analyzer is 0.9 or more.
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Accused Products
Abstract
A negative electrode material for a nonaqueous electrolyte secondary battery, where the negative electrode contains a carbon material A and a carbon material B. Carbon material A is a multilayer-structure carbon material containing a graphitic particle having an amorphous carbon surface covering, where the interplaner spacing of 002 planes, by wide-angle XRD, is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g/cm3 or more, and the Raman R value is from 0.25 to 0.6. Carbon material B is a graphitic particle where the interplanar spacing of 002 planes, by wide-angle XRD, is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g/cm3 or more, the Raman R value is from 0.2 to 0.5, and the average degree of circularity, determined by a flow-type particle analyzer, is 0.9 or more.
22 Citations
12 Claims
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1. A negative electrode material for nonaqueous electrolyte secondary battery, comprising the following carbon material A and carbon material B:
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(Carbon material A) a multilayer-structure carbon material containing a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, which is a carbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å
or less, Lc is 900 Å
or more, the tap density is 0.8 g/cm3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm−
1 to the peak intensity near 1,580 cm−
1 in the argon ion laser Raman spectrum, is from 0.25 to 0.6,(Carbon Material B) a graphitic particle where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å
or less, Lc is 900 Å
or more, the tap density is 0.8 g/cm3 or more, the Raman R value that is a ratio of the peak intensity near 1,360 cm−
1 to the peak intensity near 1,580 cm−
1 in the argon ion laser Raman spectrum, is from 0.2 to 0.5, and the average degree of circularity as determined by a flow-type particle analyzer is 0.9 or more.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification