Precursor of positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof and positive electrode active material for nonaqueous electrolyte secondary batteries and production method thereof

Patent metadata

Field	Value
Publication number	US-2019341610-A1
Application number	US-201916509941-A
Country	US
Kind code	A1
Filing date	Jul 12, 2019
Priority date	Mar 28, 2014
Publication date	Nov 7, 2019
Grant date	—

Abstract

A method for producing a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries having a hollow structure or porous structure includes obtaining the precursor by washing nickel-manganese composite hydroxide particles having a particular composition ratio and a pore structure in which pores are present within the particles with an aqueous carbonate solution having a carbonate concentration of 0.1 mol/L or more.

First claim

1 . A precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries having a hollow structure or porous structure, the precursor consisting of
nickel-manganese composite hydroxide particles represented by the general formula (1) and having a pore structure in which pores are present within the particles, wherein the precursor has a sulfate group content of 0.4% by mass or less and a sodium content of 0.035% by mass or less,
Ni x Co y Mn z M t (OH) 2   general formula (1)

where 0.2≤x≤0.8; 0≤y<0.3; 0.07<z≤0.8; 0≤t≤0.1; x+y+z+t=1; and M is at least one element selected from Mg, Ca, Ba, Sr, Al, Ti, V, Cr, Zr, Mo, Hf, Ta, and W.

2 . The precursor of the positive electrode active material for nonaqueous electrolyte secondary batteries of claim 1 , wherein the precursor has a chlorine content of 0.1% by mass or less.

3 . A positive electrode active material for nonaqueous electrolyte secondary batteries, consisting of
lithium-nickel-manganese composite oxide particles represented by the general formula (2) and having a hollow structure or porous structure, wherein the positive electrode active material has a sulfate group content of 0.4% by mass or less and a sodium content of 0.035% by mass or less,
Li a Ni x Co y Mn z M t O 2   general formula (2)

where 0.95≤a≤1.20; 0.2≤x≤0.8; 0≤y<0.3; 0.07<z≤0.8; 0≤t≤0.1; x+y+z+t=1; and M is at least one element selected from Mg, Ca, Ba, Sr, Al, Ti, V, Cr, Zr, Mo, Hf, Ta, and W).

4 . The positive electrode active material for nonaqueous electrolyte secondary batteries of claim 3 , wherein the positive electrode active material has a chlorine content of 0.05% by mass or less.

5 . A nonaqueous electrolyte secondary battery using the positive electrode active material for nonaqueous electrolyte secondary batteries of claim 1 .

Assignees

• Sumitomo Metal Mining Co

Inventors

• Aida Taira
• Toya Hiroyuki

Classifications

• C01G51/50

  of the type (MnO2)n-, e.g. Li(CoxMn1-x)O2 or Li(MyCoxMn1-x-y)O2 · CPC title

• C01P2002/50

  Solid solutions · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01P2002/52

  containing elements as dopants · CPC title