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

Patent metadata

Field	Value
Publication number	US-9705131-B2
Application number	US-201315026481-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 4, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

An object is to provide a positive electrode active material which can exhibit sufficient cycle characteristics in a non-aqueous electrolyte secondary battery.
The positive electrode active material for a non-aqueous electrolyte secondary battery of the present invention is represented by Composition Formula (2): Li x [Ni (1/3-a) [M] a Mn 2/3 ]O 2 (in the formula, M represents at least one element selected from the group consisting of Cu, Zn, Mg, Fe, Al, Co, Sc, Ti, V, Cr, Ga, Ge, Bi, Sn, Ca, B, and Zr, 0≦a≦⅙, and x represents the number of Li satisfying the atomic valence). In addition, the positive electrode active material for a non-aqueous electrolyte secondary battery is characterized in that it is obtained by reduction-ion exchange of a precursor of the positive electrode active material that is represented by Composition Formula (1): Na 2/3 [Ni (1/3-a) [M] a Mn 2/3 ]O 2 (in the formula, M and a are as defined in Composition Formula (2)).

First claim

The invention claimed is:

1. A positive electrode active material for a non-aqueous electrolyte secondary battery represented by Composition Formula (2): Li x [Ni (1/3-a) [M] a Mn 2/3 ]O 2 (in the formula, M represents at least one element selected from the group consisting of Cu, Zn, Mg, Fe, Al, Co, Sc, Ti, V, Cr, Ga, Ge, Bi, Sn, Ca, B, and Zr, 0≦a≦⅙, and x represents the number of Li satisfying the atomic valence), which is obtained by reduction-ion exchange of a precursor of the positive electrode active material that is represented by Composition Formula (1): Na 2/3 [Ni (1/3-a) [M] a Mn 2/3 ]O 2 (in the formula, M represents at least one element selected from the group consisting of Cu, Zn, Mg, Fe, Al, Co, Sc, Ti, V, Cr, Ga, Ge, Bi, Sn, Ca, B, and Zr and 0≦a≦⅙).

2. A positive electrode active material for a non-aqueous electrolyte secondary battery represented by Composition Formula (2): Li x [Ni (1/3-a) [M] a Mn 2/3 ]O 2 (in the formula, M represents at least one element selected from the group consisting of Cu, Zn, Mg, Fe, Al, Co, Sc, Ti, V, Cr, Ga, Ge, Bi, Sn, Ca, B, and Zr, 0≦a≦⅙, and x represents the number of Li satisfying the atomic valence), which has diffraction peaks at 20°-23°, 35°-40°, 42°-46°, and 64°-65°/65°-66° according to X-ray diffraction measurement and a peak intensity ratio of 42°-46° (104) relative to 17°-20° (003) of 0.60 or less.

Assignees

• Nissan Motor

Inventors

• Yamamoto Shinji

Classifications

• C01G53/50

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

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title