Positive electrode composition for nonaqueous electrolyte secondary battery, and method for producing positive electrode slurry using the positive electrode composition

Patent metadata

Field	Value
Publication number	US-9716272-B2
Application number	US-201113164359-A
Country	US
Kind code	B2
Filing date	Jun 20, 2011
Priority date	Jun 22, 2010
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A positive electrode composition comprises a positive electrode active material composed of a lithium transition metal complex oxide represented by the general formula Li 1+x Ni y Co z M 1-y-z-w L w O 2 (wherein 0≦x≦0.50, 0.30≦y≦1.0, 0<z≦0.5, 0≦w≦0.1, 0.30<y+z+w≦1, M represents at least one kind selected from Mn and Al, and L represents at least one kind of an element selected from the group consisting of Zr, Ti, Mg and W), and additive particles composed of acidic oxide particles.

First claim

What is claimed is:

1. A positive electrode composition for a nonaqueous electrolyte secondary battery, the positive electrode composition comprising:
a positive electrode active material composed of a lithium transition metal complex oxide represented by the general formula Li 1+x Ni y Co z M 1-y-z-w L w O 2 (wherein 0<x≦0.2, 0.30≦y≦1.0, 0<z≦0.5, 0≦w≦0.1, 0.30<y+z+w≦1, M represents at least one kind selected from Mn and Al, and L represents at least one kind of an element selected from the group consisting of Zr, Ti, Mg and W), and
additive particles consisting of acidic oxide particles,
wherein the acidic oxide particles are composed of at least one kind selected from the group consisting of tungsten oxide, molybdenum oxide, vanadium pentoxide, and boron oxide, and
wherein a content of the acidic oxide particles is 5.0 mol % or less expressed in terms of a ratio of a metallic element and/or a semi-metallic element in the acidic oxide particles to the positive electrode active material.

2. The positive electrode composition according to claim 1 , wherein a content of acidic oxide particles in the general formula of the positive electrode active material is 0.01 mol % or more and 1.0 mol % or less expressed in terms of a ratio of the metallic element and/or semi-metallic element in the acidic oxide particles to the positive electrode active material.

3. The positive electrode composition according to claim 1 , wherein a median diameter of the positive electrode active material is 4 μm to 8 μm and a median diameter of the additive particle is 0.1 μm to 2 μm.

4. A method for producing a positive electrode slurry for a nonaqueous electrolyte secondary battery, the method comprising:
a step of mixing a positive electrode active material composed of a lithium transition metal complex oxide represented by the general formula: Li 1+x Ni y Co z M 1-y-z-w L w O 2 (0<x≦0.2, 0.30≦y≦1.0, 0<z≦0.5, 0≦w≦0.1, 0.30<y+z+w≦1, M represents at least one kind selected from Mn and Al, and L represents at least one kind of an element selected from the group consisting of Zr, Ti, Mg and W) with additive particles consisting of acidic oxide particles to obtain a positive electrode composition; and
a step of mixing the positive electrode composition, a binder and a dispersion medium to obtain a positive electrode slurry,
wherein the acidic oxide particles are composed of at least one kind selected from the group consisting of tungsten oxide, molybdenum oxide, vanadium pentoxide, and boron oxide, and
wherein a content of the acidic oxide particles is 5.0 mol % or less expressed in terms of a ratio of a metallic element and/or a semi-metallic element in the acidic oxide particles to the positive electrode active material.

5. The method according to claim 4 , wherein a content of acidic oxide particles in the general formula of the positive electrode active material is 0.01 mol % or more and 1.0 mol % or less expressed in terms of a ratio of the metallic element and/or semi-metallic element in the acidic oxide particles to the positive electrode active material.

6. The method according to claim 4 , wherein a median diameter of the positive electrode active material is 4 μm to 8 μm and a median diameter of the additive particle is 0.1 μm to 2 μm.

Assignees

• Kawai Kenta
• Ooishi Kengo
• Sadamasu Hisato
• Kinouchi Chika
• Yoshida Yasuhiro
• Nichia Corp

Inventors

• Kawai Kenta
• Ooishi Kengo
• Sadamasu Hisato
• Kinouchi Chika
• Yoshida Yasuhiro

Classifications

• 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

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/466

  Magnesium based · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/505

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