Transition metal-containing composite hydroxide and manufacturing method thereof, positive electrode active material for a non-aqueous electrolyte secondary battery and manufacturing method thereof, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11404690-B2
Application number	US-201916709010-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Jun 26, 2015
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

The presently disclosed subject matter is directed to a positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium transition metal-containing composite oxide, comprising secondary particles formed by aggregates of primary particles. The secondary particles comprise: an outer-shell section formed by an aggregate of the primary particles; at least one aggregate section formed by an aggregate of primary particles and existing on an inside of the outer-shell section, and electrically and structurally connected to the outer-shell section; and at least one space section existing on the inside of the outer-shell section and in which there are no primary particles. The average particle size of the secondary particles being within the range 1 μm to 15 μm, an index [(d90-d10)/average particle size] that indicates a spread of a particle size distribution of the secondary particles being 0.7 or less, and the surface area per unit volume being 1.7 m2/cm3 or greater.

First claim

What is claimed is:

1. A positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium transition metal-containing composite oxide, comprising
secondary particles formed by aggregates of primary particles;
the secondary particles comprising: an outer-shell section formed by an aggregate of the primary particles; at least one aggregate section formed by an aggregate of primary particles and existing on an inside of the outer-shell section, and electrically and structurally connected to the outer-shell section; and at least one space section existing on the inside of the outer-shell section and in which there are no primary particles; and
the average particle size of the secondary particles being within the range 1 μm to 15 μm, an index [(d90−d10)/average particle size] that indicates a spread of a particle size distribution of the secondary particles being 0.7 or less, and the surface area per unit volume being 1.7 m 2 /cm 3 or greater.

2. The positive electrode active material for a non-aqueous electrolyte according to claim 1 , wherein the BET specific surface area is within the range 0.7 m 2 /g to 5.0 m 2 /g.

3. The positive electrode active material for a non-aqueous electrolyte according to claim 1 , wherein the positive electrode active material includes lithium transition metal-containing composite oxide that has a composition that is expressed by the general formula (B): Li 1+u Ni x Mn y Co z M t O 2 (where, −0.05≤u≤0.50,x+y+z+t=1, 0.3≤x≤0.95, 0.05≤y≤0.55, 0≤z≤0.4, 0≤t≤0.1, and M is at least one additional element selected from among Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W); and has a layered hexagonal crystal type crystal structure.

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

Assignees

• Sumitomo Metal Mining Co

Inventors

• Toma Takahiro
• Aida Taira
• Komukai Tetsufumi
• Kamata Yasutaka

Classifications

• C01G53/82 Primary

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

• C01P2004/61

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

• C01P2004/20

  extending in two dimensions, e.g. plate-like · CPC title

• C01P2004/50

  Agglomerated particles · CPC title

• C01P2004/03

  obtained by SEM · CPC title