Positive electrode active substance, positive electrode material, positive electrode, and non-aqueous electrolyte secondary battery
First Claim
1. 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 arithmetic average particle diameter of primary particles (D1) is 0.25 to 0.48 μ
- m, the arithmetic average particle diameter of secondary particles (D2) is 5.8 to 8.5 μ
m, the ratio value (D2/D1)) of the arithmetic average particle diameter of the secondary particles (D2) to the arithmetic average particle diameter of the primary particles (D1) is 28.7 to 33.5, the tap density of the positive electrode active substance is 2.32 to 2.65 g/cm3, and the crystallite diameter of the positive electrode active substance is 0.10 to 0.15 μ
m.
2 Assignments
0 Petitions
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 ratio value (D2/D1)) of the average particle diameter of the secondary particles (D2) to the average particle diameter of the primary particles (D1) is 11 or more.
[Representative Drawing] None
32 Citations
13 Claims
-
1. 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 arithmetic average particle diameter of primary particles (D1) is 0.25 to 0.48 μ - m, the arithmetic average particle diameter of secondary particles (D2) is 5.8 to 8.5 μ
m, the ratio value (D2/D1)) of the arithmetic average particle diameter of the secondary particles (D2) to the arithmetic average particle diameter of the primary particles (D1) is 28.7 to 33.5, the tap density of the positive electrode active substance is 2.32 to 2.65 g/cm3, and the crystallite diameter of the positive electrode active substance is 0.10 to 0.15 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- m, the arithmetic average particle diameter of secondary particles (D2) is 5.8 to 8.5 μ
Specification