Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10205161-B2
Application number	US-201514941186-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Dec 26, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A positive electrode for a nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a positive electrode current collector mainly composed of aluminum (Al), a protective layer disposed on the positive electrode current collector, and a positive electrode mixture layer containing a lithium-containing transition metal oxide and disposed on the protective layer. The protective layer has a thickness of 1 to 5 μm and contains an electroconductive material and an inorganic compound having an oxidation power lower than that of the lithium-containing transition metal oxide.

First claim

What is claimed is:

1. A positive electrode for a nonaqueous electrolyte secondary battery, the positive electrode comprising:
a positive electrode current collector;
a protective layer disposed on the positive electrode current collector; and
a positive electrode mixture layer containing a lithium-containing transition metal oxide and disposed on the protective layer, wherein:
the protective layer has a thickness of 1 μm to 5 μm and contains an electroconductive material and an inorganic compound having an oxidation power lower than that of the lithium-containing transition metal oxide, the protective layer is a mixture of electroconductive material, the inorganic compound and a binding material, and
the protective layer is formed on the positive electrode current collector at a surface density of 0.1 g/m 2 to 20 g/m 2 .

2. A positive electrode for a nonaqueous electrolyte secondary battery, the positive electrode comprising:
a positive electrode current collector;
a protective layer disposed on the positive electrode current collector; and
a positive electrode mixture layer containing a lithium-containing transition metal oxide and disposed on the protective layer, wherein:
the protective layer has a thickness of 1 μm to 5 μm and contains an electroconductive material and an inorganic compound having an oxidation power lower than that of the lithium-containing transition metal oxide, and
the protective layer further contains a binding material in an amount of 0.1% to 10% by weight based on the total weight of the protective layer.

3. A positive electrode for a nonaqueous electrolyte secondary battery, the positive electrode comprising:
a positive electrode current collector;
a protective layer disposed on the positive electrode current collector; and
a positive electrode mixture layer containing a lithium-containing transition metal oxide and disposed on the protective layer, wherein:
the protective layer has a thickness of 1 μm to 5 μm and contains an electroconductive material and an inorganic compound having an oxidation power lower than that of the lithium-containing transition metal oxide, and
the protective layer is a mixture of the electroconductive material, the inorganic compound and a binding material.

Assignees

• Panasonic Corp

Inventors

• Shiozaki Tomoki
• Endo Kazuki
• Sugita Yasunari

Classifications

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title