POSITIVE ELECTRODE ACTIVE SUBSTANCE, POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
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Accused Products
Abstract
[Object] Provided is a means which is capable, with respect to a non-aqueous electrolyte secondary battery, of suppressing a decrease in capacity when the battery is used for a long period of time, and improving cycle characteristics.
[Solving Means] Disclosed is a positive electrode active substance for a non-aqueous electrolyte secondary battery comprising a composite oxide containing lithium and nickel, in which the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles, the average particle diameter of the primary particles (D1) is 0.9 μm or less, and the average particle diameter of the primary particles (D1) and the standard deviation (σ) of the average particle diameter of the primary particles (D1) meet the relationship of D1/σ2≧24.
26 Citations
29 Claims
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1-15. -15. (canceled)
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15. A positive electrode active substance for a non-aqueous electrolyte secondary battery comprising a composite oxide containing lithium and nickel,
wherein the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles, the average particle diameter of primary particles (D1) is 0.9 μ - m or less, the average particle diameter of the primary particles (D1) and the standard deviation (σ
) of the average particle diameter of the primary particles (D1) meet the relationship of D1/σ
2≧
24, and the tap density of the positive electrode active substance is 2.3 g/cm3 or more.
- m or less, the average particle diameter of the primary particles (D1) and the standard deviation (σ
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17. The positive electrode active substance according to claim 16, wherein the composite oxide comprises a composition represented by General Formula:
- LiaNibMncCodMxO2 (with the proviso that, in the formula, a, b, c, d, and x satisfy 0.9≦
a≦
1.2, 0<
b<
1, 0<
c≦
0.5, 0<
d≦
0.5, 0≦
x≦
0.3, and b+c+d=1; and
M represents at least one selected from the group consisting of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, and Cr). - View Dependent Claims (18)
- LiaNibMncCodMxO2 (with the proviso that, in the formula, a, b, c, d, and x satisfy 0.9≦
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19. The positive electrode active substance according to claim 16, wherein the crystallite diameter of the positive electrode active substance is 0.4 μ
- m or less.
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20. The positive electrode active substance according to claim 16, wherein the BET specific surface area of the positive electrode active substance is 0.1 to 1.0 m2/g.
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21. The positive electrode active substance according to claim 16, wherein the diffraction peak of a (104) surface and the diffraction peak of a (003) surface of the positive electrode active substance obtained by powder X ray diffraction measurement have a diffraction peak intensity ratio ((003)/(104)) of 1.28 or more and a diffraction peak integrated intensity ratio ((003)/(104)) of 1.05 or more.
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22. A positive electrode material for a non-aqueous electrolyte secondary battery, the positive electrode material comprising:
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a core part comprising the positive electrode active substance according to claim 16; and a shell part comprising a lithium-containing composite oxide which is different from the positive electrode active substance.
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- 23. A positive electrode material for a non-aqueous electrolyte secondary battery, the positive electrode material being formed by containing in a mixed state of the positive electrode active substance according to claim 16 and a spinel type manganese positive electrode active substance.
- 25. A positive electrode for a non-aqueous electrolyte secondary battery, the positive electrode being obtained by forming, on a surface of a positive electrode current collector, a positive electrode active substance layer containing at least one selected from the group consisting of the positive electrode active substance according to claim 16 and a positive electrode material being formed by containing in a mixed state of the positive electrode active substance and a spinel type manganese positive electrode active substance.
Specification