Nickel-manganese composite hydroxide, method for producing the same, positive electrode active material for nonaqueous electrolyte secondary battery, method for producing the same, and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11296316-B2
Application number	US-201716320601-A
Country	US
Kind code	B2
Filing date	Jul 28, 2017
Priority date	Jul 29, 2016
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

Provided are a positive electrode active material with which a nonaqueous electrolyte secondary battery having a high energy density can be obtained, a nickel-manganese composite hydroxide suitable as a precursor of the positive electrode active material, and production methods capable of easily producing these in an industrial scale. Provided is a nickel-manganese composite hydroxide represented by General Formula (1): Ni x Mn y M z (OH) 2+α and containing a secondary particle formed of a plurality of flocculated primary particles. The nickel-manganese composite hydroxide has a half width of a diffraction peak of a (001) plane obtained by X-ray diffraction measurement of at least 0.10° and up to 0.40° and has a degree of sparsity/density represented by [(void area within secondary particle/cross section of secondary particle)×100](%) of at least 0.5% and up to 10%. Also provided is a production method of the nickel-manganese composite hydroxide.

First claim

The invention claimed is:

1. A positive electrode active material for a nonaqueous electrolyte secondary battery, the positive active material comprising: a lithium-nickel-manganese composite oxide represented by General Formula (2): Li 1+t Ni x Mn y M z O 2+β in Formula (2), M is at least one additional element selected from Co, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, Fe, and W; and t, x, y, z, and β satisfy −0.05≤t≤0.5, 0.1≤x≤0.9, 0.05≤y 0.8, 0≤z≤0.8, x+y+z=1.0, and 0≤β≤0.5 and containing a secondary particle formed of a plurality of flocculated primary particles, wherein
a degree of sparsity/density represented by [(void area within secondary particle/cross section of secondary particle)×100](%) is at least 0.5% and up to 12%, and a DBP absorption amount measured in accordance with JIS K6217-4 is at least 12 cm 3 /100 g and up to 20 cm 3 /100 g, and
[(D90−D10)/average particle diameter] that is an indicator to represent a spread of particle size distribution is at least 0.7.

2. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein a tap density is at least 2.0 g/cm 3 and up to 2.7 g/cm 3 .

3. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein a ratio I(003)/I(104) of a diffraction peak intensity I(003) of a 003 plane to a peak intensity I(104) of a 104 plane, obtained by X-ray diffraction measurement, is at least 1.7.

4. The positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 , wherein when an arbitrary radial direction from a center of a cross section of the secondary particle toward an outside thereof is regarded as an x-axis direction and a direction perpendicular to the x-axis direction is regarded as a y-axis direction, an orientation rate of a crystal ab plane measured by an electron backscatter diffraction method is at least 55% in each of the x-axis direction and the y-axis direction.

5. A nonaqueous electrolyte secondary battery comprising the positive electrode active material for a nonaqueous electrolyte secondary battery according to claim 1 for a positive electrode thereof.

Assignees

• Sumitomo Metal Mining Co

Inventors

• KANEDA Haruki
• Koshika Yuki
• Ando Takaaki

Classifications

• C01G53/82 Primary

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

• C01G53/00

  Compounds of nickel · CPC title

• C01P2006/19

  Oil-absorption capacity, e.g. DBP values · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M2004/8689

  Positive electrodes · CPC title