# US 2019/0245201 A1 · Negative electrode for metal secondary battery, metal secondary battery, and method of producing metal secondary battery

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- Number: US 2019/0245201 A1
- Document ID: US20190245201A1
- Status: Published application
- Kind: A1
- Application number: 16/236,796
- Filed: 2018-12-31
- Published: 2019-08-08
- Earliest claimed: 2018-02-05
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hideaki OKA
- Web page: https://patentgrep.com/patent/US20190245201A1

## CPC

- H01M 4/366: {as layered products}
- H01M 4/0445: {Forming after manufacture of the electrode, e.g. first charge, cycling}
- H01M 4/38: of elements or alloys
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/466: {Magnesium based}
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/052: Li-accumulators
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 2004/027: {Negative electrodes}
- H01M 2300/0082: Organic polymers
- 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 is a negative electrode for a metal secondary battery. In a full-charge state of the metal secondary battery, the negative electrode includes a first metal and a second metal. A carbon fiber aggregate includes a plurality of carbon fibers. The first metal is an alkali metal or an alkaline earth metal. The second metal is a metal alloyable with or an alloy alloyable with the first metal. The second metal is carried at least at a central portion of the carbon fiber aggregate in a thickness direction of the carbon fiber aggregate. The second metal is in the form of particles.

## Claims

### Claim 1

A negative electrode for a metal secondary battery, wherein, the negative electrode includes a carbon fiber aggregate, a first metal, and a second metal in a full-charge state of the metal secondary battery,
the carbon fiber aggregate comprises a plurality of carbon fibers,
the first metal is an alkali metal or an alkaline earth metal,
the second metal is a metal alloyable with or an alloy alloyable with the first metal,
the second metal is carried at least at a central portion of the carbon fiber aggregate in a thickness direction of the carbon fiber aggregate, and
the second metal is in the form of particles.

### Claim 2 (depends on 1)

The negative electrode according to claim 1, wherein the second metal is carried within the carbon fiber aggregate, and the amount of the second metal thus carried is not lower than 0.0046 mol % and not higher than 1.39 mol % relative to the amount of the first metal.

### Claim 3 (depends on 1)

The negative electrode according to claim 1, wherein the first metal is lithium.

### Claim 4 (depends on 1)

The negative electrode according to claim 1, wherein the second metal contains one type of metal selected from the group of metals consisting of gold, platinum, magnesium, zinc, tungsten, molybdenum, aluminum, gallium, indium, silicon, germanium, tin, lead, arsenic, antimony, and bismuth.

### Claim 5 (depends on 1)

The negative electrode according to claim 1, wherein the second metal contains gold.

### Claim 6 (depends on 1)

The negative electrode according to claim 1, wherein
the negative electrode further includes an ionically-conductive polymer layer that contains an electrolyte, and
a surface of the carbon fiber aggregate is at least partially covered with the ionically-conductive polymer layer.

### Claim 7 (depends on 6)

The negative electrode according to claim 6, wherein the ionically-conductive polymer layer contains polyvinylidene fluoride-hexafluoropropene copolymer (PVDF-HFP).

### Claim 8 (depends on 1)

A metal secondary battery comprising at least the negative electrode according to claim 1, a positive electrode, and an electrolyte.

### Claim 9 (depends on 8)

A method of producing the metal secondary battery recited in claim 8, comprising at least:
preparing the negative electrode;
preparing the positive electrode;
preparing the electrolyte;
assembling a metal secondary battery that comprises at least the positive electrode, the negative electrode, and the electrolyte; and
charging the metal secondary battery.