# US 2014/0154568 A1 · Negative electrode for alkaline secondary battery, outer case for alkaline secondary battery and alkaline secondary battery

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- Number: US 2014/0154568 A1
- Document ID: US20140154568A1
- Status: Published application
- Kind: A1
- Application number: 14/234,461
- Filed: 2012-07-27
- Published: 2014-06-05
- Earliest claimed: 2011-07-28
- Assignees: GS Yuasa International Ltd.
- Inventors: Tadashi Kakeya; Manabu Kanemoto; Mitsuhiro Kodama
- Web page: https://patentgrep.com/patent/US20140154568A1

## CPC

- H01M 4/242: {Hydrogen storage electrodes}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/24: Electrodes for alkaline accumulators
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 4/383: {Hydrogen absorbing alloys}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 10/24: Alkaline accumulators
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A negative electrode for an alkaline secondary battery includes a current collecting substrate having a substrate containing iron. The current collecting substrate does not have a conductive protecting layer, or has a conductive protecting layer having a thickness of 3 μm or less or having defects, on the substrate. The negative electrode contains magnesium or a magnesium compound and a hydrogen storing alloy.

## Claims

### Claim 1

A negative electrode for an alkaline secondary battery comprising a current collecting substrate having a substrate containing iron,
wherein the current collecting substrate has a conductive protecting layer having a thickness of 3 μm or less or having defects, on the substrate, and
wherein the negative electrode contains magnesium or a magnesium compound and a hydrogen storage alloy.

### Claim 2 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein the protecting layer comprises nickel.

### Claim 3 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein the protecting layer is a plating film.

### Claim 4

(canceled)

### Claim 5 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein the hydrogen storage alloy layer contains magnesium or a magnesium compound and a hydrogen storage alloy.

### Claim 6

(canceled)

### Claim 7 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein a magnesium compound layer and a hydrogen storage alloy layer are formed on the current collecting substrate.

### Claim 8 (depends on 7)

The negative electrode for an alkaline secondary battery according to claim 7, wherein the magnesium compound layer is formed directly on the current collecting substrate.

### Claim 9 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein the content of magnesium or the magnesium compound is 0.1 to 3.0% by mass with respect to the total amount of the hydrogen storage alloy and magnesium or the magnesium compound in the negative electrode.

### Claim 10 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein a magnesium layer is formed on the current collecting substrate when the negative electrode is observed by using an electron probe microanalyzer.

### Claim 11 (depends on 1)

The negative electrode for an alkaline secondary battery according to claim 1, wherein the magnesium compound is magnesium oxide.

### Claim 12

(canceled)

### Claim 13 (depends on 1)

An alkaline secondary battery comprising the negative electrode for an alkaline secondary battery according to claim 1.

### Claim 14

An alkaline secondary battery comprising a negative electrode for an alkaline secondary battery comprising a current collecting substrate having a substrate containing iron, and a separator,
wherein a magnesium compound layer is formed on a separator surface opposed to the negative electrode.

### Claim 15

A negative electrode for an alkaline secondary battery comprising a current collecting substrate having a substrate containing iron,
wherein the current collecting substrate does not have a conductive protecting layer on the substrate, and
wherein the negative electrode contains magnesium or a magnesium compound and a hydrogen storage alloy.

### Claim 16 (depends on 15)

The negative electrode for an alkaline secondary battery according to claim 15, wherein the hydrogen storage alloy layer contains magnesium or a magnesium compound and a hydrogen storage alloy.

### Claim 17 (depends on 15)

The negative electrode for an alkaline secondary battery according to claim 15, wherein a magnesium compound layer and a hydrogen storage alloy layer are formed on the current collecting substrate.

### Claim 18 (depends on 17)

The negative electrode for an alkaline secondary battery according to claim 17, wherein the magnesium compound layer is formed directly on the current collecting substrate.

### Claim 19 (depends on 15)

The negative electrode for an alkaline secondary battery according to claim 15, wherein the content of magnesium or the magnesium compound is 0.1 to 3.0% by mass with respect to the total amount of the hydrogen storage alloy and magnesium or the magnesium compound in the negative electrode.

### Claim 20 (depends on 15)

The negative electrode for an alkaline secondary battery according to claim 15, wherein a magnesium layer is formed on the current collecting substrate when the negative electrode is observed by using an electron probe microanalyzer.

### Claim 21 (depends on 15)

The negative electrode for an alkaline secondary battery according to claim 15, wherein the magnesium compound is magnesium oxide.

### Claim 22 (depends on 15)

An alkaline secondary battery comprising the negative electrode for an alkaline secondary battery according to claim 15.