Positive electrode for alkaline secondary battery and alkaline secondary battery

Patent metadata

Field	Value
Publication number	US-2020028157-A1
Application number	US-201816483722-A
Country	US
Kind code	A1
Filing date	Feb 5, 2018
Priority date	Feb 8, 2017
Publication date	Jan 23, 2020
Grant date	—

Abstract

There is provided a positive electrode for an alkaline secondary battery and an alkaline secondary battery having good output properties and cycle life. To that end, a positive electrode (10) for alkaline secondary battery is obtained by laminating a flexible metal substrate (11) having flexibility; a primer layer (12) having conductivity provided on one or both surfaces of the substrate (11); and a positive electrode composite material layer (13) provided on the primer layer (12) and containing a positive electrode active material, a binder resin, and a first conductive material.

First claim

1 . A positive electrode for alkaline secondary battery having a lamination comprising:
a metal substrate having flexibility; a primer layer having conductivity provided on one or both surfaces of the substrate; and a positive electrode composite material layer provided on the primer layer and containing a positive electrode active material, a binder resin, and a first conductive material.

2 . The positive electrode for alkaline secondary battery according to claim 1 , wherein the primer layer contains a second conductive material having an average particle diameter of 1 μm or more and 50 μm or less and an aspect ratio of 10 or more and 100 or less.

3 . The positive electrode for alkaline secondary battery according to claim 2 , wherein a shape of the second conductive material is a lamellar shape or a fibrous shape.

4 . The positive electrode for alkaline secondary battery according to claim 2 , wherein the second conductive material is graphite.

5 . The positive electrode for alkaline secondary battery according to claim 1 , wherein an aqueous resin is contained in the primer layer and the positive electrode composite material layer.

6 . The positive electrode for alkaline secondary battery according to claim 5 , wherein the aqueous resin contained in the primer layer contains a water soluble resin and the aqueous resin contained in the positive electrode composite material layer contains an emulsion type resin.

7 . The positive electrode for alkaline secondary battery according to claim 6 , wherein a glass transition temperature of the emulsion type resin is −20° C. or more and 20° C. or less.

8 . The positive electrode for alkaline secondary battery according to claim 1 , wherein a thickness of the primer layer is 1 μm or more and 20 μm or less.

9 . The positive electrode for alkaline secondary battery according to claim 1 , wherein 0.01% by mass or more and 5% by mass or less of a radical scavenger is contained in a primer composition of the primer layer.

10 . The positive electrode for alkaline secondary battery according to claim 9 , wherein a content of the radical scavenger is 0.01% by mass or more and 20.0% by mass or less based on 100 parts by mass of the binder resin.

11 . The positive electrode for alkaline secondary battery according to claim 9 , wherein the radical scavenger is hindered amine.

12 . The positive electrode for alkaline secondary battery according to claim 9 , wherein the first conductive material is contained in the positive electrode composite material layer and a content of the radical scavenger to the first conductive material is 0.01% by mass or more and 20.0% by mass or less.

13 . The positive electrode for alkaline secondary battery according to claim 1 , wherein a thickness of the substrate is 6 μm or more and 30 μm or less.

14 . The positive electrode for alkaline secondary battery according to claim 1 , wherein the substrate is a nickel-plated steel sheet.

15 . An alkaline secondary battery comprising:
the positive electrode for alkaline secondary battery according to claim 1 ; a negative electrode; and a separator.

16 . The alkaline secondary battery according to claim 15 , wherein the negative electrode contains a hydrogen absorbing alloy, cadmium, or zinc.

17 . The positive electrode for alkaline secondary battery according to claim 3 , wherein the second conductive material is graphite.

18 . The positive electrode for alkaline secondary battery according to claim 2 , wherein an aqueous resin is contained in the primer layer and the positive electrode composite material layer.

19 . The positive electrode for alkaline secondary battery according to claim 3 , wherein an aqueous resin is contained in the primer layer and the positive electrode composite material layer.

20 . The positive electrode for alkaline secondary battery according to claim 4 , wherein an aqueous resin is contained in the primer layer and the positive electrode composite material layer.

Assignees

• Toppan Printing Co Ltd
• Toyochem Co Ltd
• Toyo Ink Sc Holdings Co Ltd

Inventors

• Serikawa Masahiro
• Kitamoto Tsuyoshi

Classifications

• H01M4/246

  Cadmium electrodes · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/242 Primary

  Hydrogen storage electrodes · CPC title

• H01M4/244 Primary

  Zinc electrodes · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title