Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same

Patent metadata

Field	Value
Publication number	US-10840510-B2
Application number	US-201515329599-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Jul 31, 2014
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

Provided is a positive electrode active material that is capable of improving output characteristics when used as positive electrode material for a non-aqueous electrolyte secondary battery. A lithium mixture that is obtained by adding and mixing a lithium compound to a transition metal composite hydroxide that was obtained from a crystallization reaction undergoes calcination in an atmosphere having an oxygen concentration of 4% by volume or greater. In this calcination process, carbon dioxide gas concentration in the atmosphere while the temperature is maintained at a calcination temperature is kept at 10% by volume or less, and preferably kept at 0.01% by volume to 10% by volume. As a result, positive electrode active material is obtained that includes a lithium transition metal composite oxide that is composed of secondary particles that are formed from aggregates of plural primary particles, and that has a carbon content of 0.010% by mass to 0.100% by mass.

First claim

The invention claimed is:

1. A positive electrode active material for a non-aqueous electrolyte that includes a lithium transition metal composite oxide that is composed of secondary particles that are formed from aggregates of plural primary particles and is expressed by a general expression (A): Li 1+u Ni x Mn y Co z M t O 2 , where −0.05≤u≤0.20, x+y+z+t=1, 0.5≤x<0.7, 0≤y≤0.55, 0≤z≤0.4, 0≤t≤0.1, and M is one or more kind of additional element that is selected from among Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W,
wherein the lithium transition metal composite oxide includes carbon that exists on a surface of the secondary particles in the form of lithium carbonate, and the carbon content measured by high-frequency combustion infrared analysis of the positive electrode active material is 0.010% by mass to 0.100% by mass.

2. A positive electrode active material for a non-aqueous electrolyte that includes a lithium transition metal composite oxide that is expressed by a general expression (B): Li 1+u Ni x Mn y Co z M t O 2 , where −0.05≤u≤0.20, x+y+z+t=1, 0.3≤x≤0.5, 0.1≤y≤0.4, 0.1≤z≤0.4, 0≤t≤0.1, and M is one or more kind of additional element that is selected from among Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W,
wherein the lithium transition metal composite oxide includes carbon that exists on a surface of the secondary particles in the form of lithium carbonate, and the carbon content measured by high-frequency combustion infrared analysis of the positive electrode active material is 0.010% by mass to 0.100% by mass.

3. The positive electrode active material for a non-aqueous electrolyte according to claim 1 , wherein the secondary particles of the lithium transition metal composite oxide comprise a hollow structure having a hollow section and an outer-shell section that is around the outside of the hollow section.

4. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, and that uses the positive electrode active material for a non-aqueous electrolyte according to claim 1 as a positive electrode material for the positive electrode.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Oda Syuhei

Classifications

• C01G53/82

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01P2002/50

  Solid solutions · CPC title