# US 10,320,001 B2 · Secondary cell

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- Number: US 10,320,001 B2
- Document ID: US10320001B2
- Status: Granted
- Kind: B2
- Application number: 15/289,502
- Filed: 2016-10-10
- Published: 2017-04-20
- Granted: 2019-06-11
- Earliest claimed: 2015-10-20
- Assignees: Ricoh Company, Ltd.
- Applicants: Masayoshi Nomura
- Inventors: Masayoshi Nomura
- Web page: https://patentgrep.com/patent/US10320001B2

## CPC

- H01M 4/606: {containing aromatic main chain polymers}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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

To provide a secondary cell including an electrode active material that is a compound represented by General Formula (1) below: where n is a natural number of from 4 through 8, a is a natural number of from 1 through 4, R1 and R2 may be identical to or different from each other and are each a hydrogen atom, an alkyl group, or an aromatic hydrocarbon group that may have a substituent, Y is a substituent, and b is an integer of from 0 through 3 and a+b is 4 or less in General Formula (1).

## Claims

### Claim 1

A secondary cell comprising:
an electrode active material that is a compound represented by General Formula (1) below:
where n is a natural number of from 4 through 8, a is a natural number of from 1 through 4, R1 and R2 may be identical to or different from each other and are each a hydrogen atom, an alkyl group, or an aromatic hydrocarbon group that may have a substituent, Y is a substituent, and b is an integer of from 0 through 3 and a+b is 4 or less in General Formula (1),
wherein when n ranges from 4 to 6:
b is at least 1 and at least one Y in General Formula (1) is a substituent selected from the group consisting of a halogen atom, an alkoxy group, an aryl group, —SO3X where X is a hydrogen atom or an alkali metal, a sulfonic acid ester group, a carbamoyl group, a formyl group, a carboxyl group, and a carboxylic acid ester group; or
at least one of R1 and R2 within General Formula (1) is an alkyl group, or an aromatic hydrocarbon group that may have a substituent.

### Claim 2 (depends on 1)

The secondary cell according to claim 1, wherein at least one of R1 and R2 in General Formula (1) are hydrogen atoms.

### Claim 3 (depends on 1)

The secondary cell according to claim 1, wherein Y in General Formula (1) is a hydrogen atom, an alkyl group, an alkoxy group, —SO3X, a formyl group, a carboxyl group, or a carboxylic acid ester group, where X in —SO3X is a hydrogen atom or an alkali metal.

### Claim 4 (depends on 1)

The secondary cell according to claim 1, wherein Y in General Formula (1) is a hydrogen atom, —SO3X, a formyl group, a carboxyl group, or a carboxylic acid ester group, where X in —SO3X is a hydrogen atom or an alkali metal.

### Claim 5 (depends on 1)

The secondary cell according to claim 1, wherein b in General Formula (1) is 0.

### Claim 6 (depends on 1)

The secondary cell according to claim 1, wherein n in General Formula (1) is 6 or 8.

### Claim 7 (depends on 1)

The secondary cell according to claim 1, wherein the compound represented by General Formula (1) is at least one selected from the group consisting of compounds represented by structural formulae below:

### Claim 8 (depends on 1)

The secondary cell according to claim 1, wherein the compound represented by General Formula (1) is a cathode active material.

### Claim 9 (depends on 1)

The secondary cell according to claim 1, wherein the compound represented by General Formula (1) undergoes a redox reaction during at least one of a charging process and a discharging process.

### Claim 10 (depends on 1)

The secondary cell according to claim 1, further comprising:
a cathode;
an anode; and
an electrolyte.

### Claim 11 (depends on 1)

The secondary cell according to claim 1, wherein the secondary cell is a lithium ion secondary cell.