Lithium composite metal oxide, positive electrode active substance, positive electrode, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2015188132-A1
Application number	US-201314408487-A
Country	US
Kind code	A1
Filing date	Jun 28, 2013
Priority date	Jul 6, 2012
Publication date	Jul 2, 2015
Grant date	—

Abstract

A lithium composite metal oxide that contains Li, Ni, and Mn, has a layered structure, has a diffraction peak in a range of 2θ=20.8±1° in a powder X-ray diffraction pattern obtained with powder X-ray diffraction measurement using a Cu—Kα radiation, has a BET specific surface area in a range of 6 m 2 /g to 30 m 2 /g, and has an average particle diameter measured with a laser diffraction scattering method in a range of 0.1 μm to 10 μm.

First claim

1 . A lithium composite metal oxide which
contains Li, Ni, and Mn, has a lamellar structure, has a diffraction peak in a range of 2θ=20.8±1° in a powder X-ray diffraction pattern obtained through powder X-ray diffraction measurement using a Cu—Kα radiation, has a BET specific surface area of from 6 m 2 /g to 30 m 2 /g, and has an average particle diameter measured by a laser diffraction scattering method of from 0.1 μm to 10 μm.

2 . The lithium composite metal oxide according to claim 1 ,
wherein an average primary particle diameter of the lithium composite metal oxide is from 0.05 μm to 0.3 μm.

3 . The lithium composite metal oxide according to claim 1 ,
wherein the lithium composite metal oxide is represented by Formula (A) described below
Li a Ni 1-x-y Mn x M y O 2   (A)

(Here, 1.1≦a≦1.6, 0.4≦x≦0.8, 0≦y≦0.25, 0.5≦x+y≦0.8, and M represents one or more elements selected from the group consisting of Co, Fe, Mg, Al, and Ca).

4 . The lithium composite metal oxide according to claim 1 , 2,
wherein the lithium composite metal oxide is represented by Formula (B) described below
n Li 2b/3 MnO 3 .(1 −n )Li b/3 Ni 1-p-q Mn p M q O 2   (B)

(Here, 0.2≦n≦0.6, 2.75≦b≦3.0, 0.25≦p≦0.5, 0≦q≦0.31, 0.38≦p+q≦0.5, and M represents one or more elements selected from the group consisting of Co, Fe, Mg, Al, and Ca).

5 . The lithium composite metal oxide according to claim 3 ,
wherein the Ms are either of or both of Co and Fe.

6 . A positive electrode active material comprising:
the lithium composite metal oxide according to claim 1 .

7 . A positive electrode comprising:
the positive electrode active substance according to claim 6 .

8 . A non-aqueous electrolyte secondary battery comprising:
a negative electrode and the positive electrode according to claim 7 .

9 . The non-aqueous electrolyte secondary battery according to claim 8 ,
wherein a charge potential of the positive electrode in a fully charged state is 4.35 V (vs. Li/Li + ) or more.

Assignees

• Sumitomo Chemical Co

Inventors

• Takamori Kenji

Classifications

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/525 Primary

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

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title