Positive-electrode active material for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery
View Patent ↗The present invention provides a positive electrode active material for a lithium ion battery having good battery performance can be provided. The positive electrode active material for a lithium ion battery is represented by; Compositional formula:Li x Ni 1−y M y O 2+α wherein M is one or more selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr, 0.9≦x≦1.1, 0<y≦0.7, and 0.05≦α≦0.2, and contains primary particles and has a tap density of 1.3 to 2.6 g/cm 3 . The average particle size of the primary particles is 0.3 to 3.0 μm and the specific surface area is 0.3 to 2.3 m 2 /g.
1. A positive electrode active material for a lithium ion battery represented by;
Compositional formula: Li x Ni 1−y M y O 2+α
wherein M is one or more selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr, 0.9≦x≦1.1, 0<y≦0.7, and 0.05≦α≦0.2,
which contains primary particles and has a tap density of 1.3 to 2.6 g/cm 3 ,
wherein the average particle size of the primary particles is 0.3 to 3.0 μm and the specific surface area is 0.3 to 2.3 m 2 /g,
the positive electrode active material having, in a particle size distribution graph (x-axis: particle size, y-axis: relative particle weight), a maximum point in a particle size of 1 μm or more and a difference between the particle size in the maximum point and a median diameter (D50) of 1.5 μm or less.
2. The positive electrode active material for a lithium ion battery according to claim 1 , having a tap density of 1.4 to 2.6 g/cm 3 .
3. The positive electrode active material for a lithium ion battery according to claim 2 , having a tap density of 1.8 to 2.5 g/cm 3 .
4. The positive electrode active material for a lithium ion battery according to claim 1 , having a particle size in the maximum point of 2 to 15 μm.
5. The positive electrode active material for a lithium ion battery according to claim 1 , wherein M is one or more selected from Mn and Co.
6. The positive electrode active material for a lithium ion battery according to claim 1 , having the primary particles having an average particle size of 0.6 to 3.0 μm and a specific surface area of 0.4 to 1.5 m 2 /g.
7. The positive electrode active material for a lithium ion battery according to claim 6 , having the primary particles having an average particle size of 1.6 to 2.0 μm and a specific surface area of 0.5 to 1.0 m 2 /g.
8. A positive electrode for lithium ion battery comprising the positive electrode active material described in any one of claims 1 to 7 .
9. A lithium ion battery comprising the positive electrode for lithium ion battery described in claim 8 .