# US 10,320,026 B2 · Electrode for secondary battery and secondary battery using same

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- Number: US 10,320,026 B2
- Document ID: US10320026B2
- Status: Granted
- Kind: B2
- Application number: 15/521,272
- Filed: 2015-10-16
- Published: 2017-10-26
- Granted: 2019-06-11
- Earliest claimed: 2014-10-21
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Takeshi Azami
- Web page: https://patentgrep.com/patent/US10320026B2

## CPC

- H01M 10/05: Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence)
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/625: {Carbon or graphite}
- H01M 4/139: Processes of manufacture
- H01M 10/052: Li-accumulators
- H01M 2004/028: {Positive 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

A secondary battery which is highly safe even when it becomes in excessively high-temperature conditions and is excellent in cycle characteristics, and an electrode for a secondary battery are provided. The present invention relates to an electrode for a secondary battery comprising a maleimide compound and a conductive agent, wherein the conductive agent comprises at least one selected from carbon nanotube and carbon nanohorns.

## Claims

### Claim 1

An electrode for a secondary battery comprising a maleimide compound, a conductive agent and an electrode active material, wherein
the maleimide compound is a maleimide resin compound comprising a repeating unit comprising a maleimide monomer residue and a dione compound residue,
the conductive agent comprises at least one selected from carbon nanotubes and carbon nanohorns, and
a ratio of a coverage of the maleimide compound on the electrode active material to a coverage of the conductive agent on the electrode active material is 0.15 to 2.

### Claim 2 (depends on 1)

The secondary battery electrode according to claim 1, wherein the maleimide compound has two or more maleimide groups.

### Claim 3 (depends on 1)

The secondary battery electrode according to claim 1, wherein the maleimide compound comprises a polymer which is a reaction product of a bismaleimide and a barbituric acid.

### Claim 4 (depends on 1)

The secondary battery electrode according to claim 1, wherein the conductive agent comprises a carbon nanotube.

### Claim 5 (depends on 4)

The secondary battery electrode according to claim 4, wherein the average D/G ratio according to Raman spectroscopic measurement of the carbon nanotube is 0.2 to 1.2.

### Claim 6 (depends on 4)

The secondary battery electrode according to claim 4, wherein the aspect ratio of the carbon nanotube is 200 to 900.

### Claim 7 (depends on 1)

The secondary battery electrode according to claim 1, wherein the conductive agent further comprises carbon black.

### Claim 8 (depends on 1)

A secondary battery comprising the secondary battery electrode according to claim 1.

### Claim 9 (depends on 8)

The secondary battery according to claim 8 comprising the secondary battery electrode as a positive electrode.

### Claim 10 (depends on 8)

An assembled battery comprising the secondary battery according to claim 8.

### Claim 11 (depends on 1)

The secondary battery electrode according to claim 1, wherein the ratio is 0.15 to 1.

### Claim 12 (depends on 1)

The secondary battery electrode according to claim 1, wherein an amount of the maleimide compound is 0.1 to 1.0 wt % of the electrode active material and an amount of the conductive agent is 0.5 to 4.5 wt % of the electrode active material.

### Claim 13 (depends on 1)

The secondary battery electrode according to claim 1, wherein the maleimide compound is a maleimide resin compound prepared by reacting a maleimide monomer and a dione compound in a solvent containing a Bronsted base.

### Claim 14 (depends on 1)

The secondary battery electrode according to claim 1, wherein an amount of the maleimide compound is 0.1 wt % or less of the electrode active material.