Positive electrode active material for nonaqueous secondary battery, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2020266441-A1
Application number	US-202016795539-A
Country	US
Kind code	A1
Filing date	Feb 19, 2020
Priority date	Feb 20, 2019
Publication date	Aug 20, 2020
Grant date	—

Abstract

Provided is a positive-electrode active material for a nonaqueous electrolyte secondary battery, including a lithium transition metal composite oxide particle having a layered structure and containing nickel, and an oxide containing lithium and aluminum and an oxide containing lithium and boron adhering to a surface of the lithium transition metal composite oxide particle. The lithium transition metal composite oxide particle includes a secondary particle formed by aggregation of primary particles containing a solid solution of aluminum in a surface layer. The lithium transition metal composite oxide particles have a composition with a difference of more than 0.22 mol % and less than 0.6 mol % between a ratio of the number of moles of aluminum in the solid solution in the surface layer of the primary particles relative to a total number of moles of metal other than lithium and a ratio of the number of moles of aluminum present in a region other than the surface layer of the primary particles relative to the total number of moles of metal other than lithium.

First claim

What is claimed is:

1 . A positive-electrode active material for a nonaqueous electrolyte secondary battery comprising:
a lithium transition metal composite oxide particle having a layered structure and containing nickel; and an oxide containing lithium and aluminum and an oxide containing lithium and boron adhering to a surface of the lithium transition metal composite oxide particle, wherein the lithium transition metal composite oxide particle comprises a secondary particle formed by aggregation of primary particles containing a solid solution of aluminum in a surface layer, and wherein the positive-electrode active material has a composition with a difference of more than 0.22 mol % and less than 0.6 mol % between a ratio of a number of moles of aluminum in the solid solution in the surface layer of the primary particles relative to a total number of moles of metal other than lithium in the lithium transition metal composite oxide particle and a ratio of a number of moles of aluminum present in a region other than the surface layer of the primary particles relative to the total number of moles of metal other than lithium in the lithium transition metal composite oxide particle.

2 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
a content of the oxide containing lithium and aluminum relative to the lithium transition metal composite oxide particle is 0.1 mol % to 0.8 mol % in terms of aluminum, and wherein a content of the oxide containing lithium and boron relative to the lithium transition metal composite oxide particle is 0.3 mol % to 2.0 mol % in terms of boron.

3 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the lithium transition metal composite oxide particle has a composition in which a ratio of a number of moles of nickel to the total number of moles of metal other than lithium is 0.33 or more and 0.95 or less.

4 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the lithium transition metal composite oxide particle has a composition comprising cobalt, and wherein a ratio of a number of moles of cobalt to the total number of moles of metal other than lithium in the composition is 0.02 or more and 0.33 or less.

5 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the lithium transition metal composite oxide particle has a composition comprising manganese, and wherein a ratio of a number of moles of manganese to the total number of moles of metal other than lithium in the composition is 0.01 or more and 0.33 or less.

6 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the lithium transition metal composite oxide has a composition represented by the following formula:
Li a Ni b Co c Mn d Al e M 1 t O 2
wherein 1.0≤a≤1.5, 0.33≤b≤0.95, 0.02≤c≤0.33, 0.01≤d≤0.33, 0.0022≤e≤0.05, 0≤f≤0.02, and b+c+d=1, and M 1 is at least one selected from the group consisting of Zr, Ti, Mg, Ta, Nb, and Mo.

7 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein
the oxide containing lithium and aluminum has a volume-based particle diameter distribution in which a total volume percentage of particles having a particle diameter of 0.4 μm to 3.0 μm is greater than 50%.

8 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 2 , wherein
the lithium transition metal composite oxide has a composition represented by the following formula:
Li a Ni b Co c Mn d Al e M 1 f O 2
wherein 1.0≤a≤1.5, 0.33≤b≤0.95, 0.02≤c≤0.33, 0.01≤d≤0.33, 0.0022≤e≤0.05, 0≤f≤0.02, and b+c+d=1, and M 1 is at least one selected from the group consisting of Zr, Ti, Mg, Ta, Nb, and Mo.

9 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein a volume average particle diameter of the lithium transition metal composite oxide particle is 2 μm to 25 μm.

10 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 2 , wherein the content of the oxide containing lithium and aluminum relative to the lithium transition metal composite oxide particle is 0.13 mol % to 0.5 mol % in terms of aluminum.

11 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 2 , wherein a volume average particle diameter of the lithium transition metal composite oxide particle is 2 μm to 25 μm.

12 . The positive-electrode active material for a nonaqueous electrolyte secondary battery according to claim 11 , wherein the content of the oxide containing lithium and aluminum relative to the lithium transition metal composite oxide particle is 0.13 mol % to 0.5 mol % in terms of aluminum.

13 . A method for manufacturing a positive-electrode active material for a nonaqueous electrolyte secondary battery comprising:
providing a mixture containing a lithium transition metal composite oxide particle having a layered structure and containing nickel, a lithium compound, an aluminum compound, and a boron compound; and heat-treating the provided mixture, wherein the lithium transition metal composite oxide particle comprises a secondary particle formed by aggregation of primary particles, and wherein the aluminum compound has a volume-based particle diameter distribution in which a total volume percentage of particles having a particle diameter of 0.4 μm to 3.0 μm is greater than 54%.

14 . The method according to claim 13 , wherein a temperature of the heat treatment is 500° C. to 800° C.

15 . The method according to claim 13 , wherein
the lithium transition metal composite oxide particle has a composition in which a ratio of a number of moles of nickel to a total number of moles of metal other than lithium is 0.33 or more and 0.95 or less.

16 . The method according to claim 13 , wherein
the lithium transition metal composite oxide particle has a composition comprising cobalt, and wherein a ratio of a number of moles of cobalt to a total number of moles of metal other than lithium in the composition is 0.02 or more and 0.33 or less.

17 . The method according to claim 13 , wherein
the lithium transition metal composite oxide particle has a composition comprising manganese, and wherein a ratio of a number of moles of manganese to a total number of moles of metal other than lithium in the composition is 0.01 or more and 0.33 or less.

18 . The method according to claim 13 , wherein
an oxide containing lithium and aluminum adhering to a surface of the lithium transition metal composite oxide particle after the heat treatment has a volume-based particle diameter distribution in which a total volume percentage of particles having a particle diameter of 0.4 μm to 3.0 μm is greater than 50%.

19 . The method according to claim 13 , wherein a volume average particle diameter of the lithium transition metal composite oxide particle is 2 μm to 25 μm.

20 . The method according to claim 18 , wherein a volume average particle diameter of the lithium transition metal composite oxide particle is 2 μm to 25 μm.

Assignees

• Nichia Corp

Inventors

• Yoshihara Kumi
• Shimokita Kosuke
• Ikebata Kiyoto
• Sugimoto Takashi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title