# US 12,009,521 B2 · Negative electrode for batteries, battery, and method for producing battery

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- Number: US 12,009,521 B2
- Document ID: US12009521B2
- Status: Granted
- Kind: B2
- Application number: 16/757,241
- Filed: 2018-10-24
- Published: 2021-05-06
- Granted: 2024-06-11
- Earliest claimed: 2017-11-08
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Shunsuke Sata; Hirotaka Mizuhata
- Web page: https://patentgrep.com/patent/US12009521B2

## CPC

- H01M 4/244: {Zinc electrodes}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/364: {as mixtures}
- H01M 4/366: {as layered products}
- H01M 4/38: of elements or alloys
- H01M 4/48: of inorganic oxides or hydroxides
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

An active material layer of a metal negative electrode includes: active material particles including a negative active material; and an additive having particles larger in average particle size than the active material particles. The metal negative electrode is immersed in an alkaline aqueous solution, and the additive is eluted into the alkaline aqueous solution. In a place where the additive is previously found, a space is defined in the active material layer.

## Claims

### Claim 1

A negative electrode, for a battery using an alkaline aqueous solution as an electrolytic solution, including metal as a negative active material, the negative electrode comprising
an active material layer including an additive and active material particles including a zinc-containing compound,
the additive comprising particles with an average particle size larger than an average particle size of the active material particles, and
the additive further comprising at least one selected from a group consisting of a compound including an element in a second family of a periodic table among elements acting as basic oxides and another compound including an element in a thirteenth family of the periodic table among elements acting as amphoteric oxides, wherein
the additive contains ranges from 0.01 parts by mass to 2.8 parts by mass inclusive per 100 parts by mass of the active material particles,
a thickness of the negative electrode for the battery is 500 μm to 10 mm,
the additive further comprises: a first additive; and a second additive comprising particles with an average particle size smaller than an average particle size of particles of the first additive,
the second additive is more dissolvable in the alkaline aqueous solution than the first additive,
the first additive is aluminum oxide, and
the second additive is calcium oxide.

### Claim 2 (depends on 1)

The negative electrode according to claim 1, wherein
the first additive has an average particle size ranging from 30 μm to 100 μm, and the second additive has an average particle size ranging from 10 μm to 30 μm.

### Claim 3 (depends on 1)

The negative electrode according to claim 1, wherein
the active material layer includes a plurality of active material layers stacked together along a thickness of the active material layer, the plurality of active material layers including an outer active material layer and an inner active material layer along the thickness, and the outer active material layer being larger in number of particles than the inner active material layer.

### Claim 4 (depends on 1)

The negative electrode according to claim 1, further comprising
a current collector provided in a center along a thickness of the active material layer.

### Claim 5 (depends on 4)

The negative electrode according to claim 4, wherein
a thickness ratio of the active material layer to the current collector ranges from 1 to 1250 inclusive.

### Claim 6 (depends on 4)

A battery comprising
the negative electrode according to claim 4.

### Claim 7 (depends on 1)

The negative electrode according to claim 1, wherein
the thickness of the negative electrode for the battery is 1 mm to 6 mm.