# US 12,191,494 B2 · Composite particles for electrochemical device and method of producing same, binder composition for electrochemical device functional layer and method of producing same, conductive material paste for electrode mixed material layer and method of producing same, slurry for electrode mixed material layer, electrode for electrochemical device, and electrochemical device

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- Number: US 12,191,494 B2
- Document ID: US12191494B2
- Status: Granted
- Kind: B2
- Application number: 17/597,048
- Filed: 2020-06-17
- Published: 2022-07-28
- Granted: 2025-01-07
- Earliest claimed: 2019-06-28
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Maki Mesuda; Kenya Sonobe; Yasuhiro Isshiki
- Web page: https://patentgrep.com/patent/US12191494B2

## CPC

- H01G 11/42: Powders or particles, e.g. composition thereof
- H01M 4/622: {being polymers}
- H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes
- H01G 11/38: Carbon pastes or blends; Binders or additives therein
- H01G 11/50: specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
- H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34)
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01G 11/48: Conductive polymers
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- Y02E 60/10: Energy storage using batteries
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- 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

Provided is a novel technique relating to electrochemical devices that makes it possible to ensure a high level of safety of an electrochemical device while also causing the electrochemical device to display excellent high-temperature storage characteristics. One or more composite particles for an electrochemical device each include a core particle and a shell portion at least partially covering an outer surface of the core particle. The core particle contains a melamine compound, and the shell portion contains an inorganic material.

## Claims

### Claim 1

One or more composite particles for an electrochemical device each comprising: a core particle; and a shell portion at least partially covering an outer surface of the core particle, wherein
the core particle contains a melamine compound represented by the following formula (I), where each A represents, independently of one another, a hydroxyl group or —NR1R2, where R1 and R2 each represent, independently of each other, a hydrogen atom, a hydrocarbon group, or a hydroxyl group-containing hydrocarbon group; when more than one R1 is present in formula (I), each R1 may be the same or different; and when more than one R2 is present in formula (I), each R2 may be the same or different,
and the shell portion contains an inorganic material.

### Claim 2 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the shell portion further contains a shell polymer.

### Claim 3 (depends on 2)

The composite particles for an electrochemical device according to claim 2, wherein the shell polymer includes at least one selected from the group consisting of a carboxy group, a hydroxyl group, a nitrile group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, a sulfo group, an ester group, an aldehyde group, and an amide group.

### Claim 4 (depends on 2)

The composite particles for an electrochemical device according to claim 2, wherein the shell polymer includes a carboxy group and an amide group.

### Claim 5 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the core particle has a volume-average particle diameter of not less than 0.01 μm and not more than 10.00 μm.

### Claim 6 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the core particle has a volume-average particle diameter of not less than 0.01 μm and less than 1.00 μm.

### Claim 7 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the inorganic material includes a carbon material.

### Claim 8 (depends on 7)

The composite particles for an electrochemical device according to claim 7, wherein the carbon material includes carbon nanotubes.

### Claim 9 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the inorganic material includes a particulate inorganic material, and the particulate inorganic material has a volume-average particle diameter of not less than 1 nm and not more than 500 nm.

### Claim 10 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the inorganic material includes a fibrous inorganic material, and the fibrous inorganic material has an average minor axis of not less than 1 nm and not more than 500 nm.

### Claim 11 (depends on 1)

The composite particles for an electrochemical device according to claim 1, wherein the inorganic material includes a coupling agent.

### Claim 12 (depends on 11)

The composite particles for an electrochemical device according to claim 11, wherein the coupling agent includes a silane coupling agent.

### Claim 13 (depends on 1)

A binder composition for an electrochemical device functional layer comprising: the composite particles for an electrochemical device according to claim 1; a binder for a functional layer; and a solvent.

### Claim 14 (depends on 13)

The binder composition for an electrochemical device functional layer according to claim 13, wherein the binder for a functional layer is a polymer including at least one selected from the group consisting of a carboxy group, a hydroxyl group, a nitrile group, an amino group, an epoxy group, an oxazoline group, an isocyanate group, a sulfo group, an ester group, an aldehyde group, and an amide group.

### Claim 15 (depends on 13)

A conductive material paste for an electrode mixed material layer comprising: the binder composition for an electrochemical device functional layer according to claim 13; and a conductive material.

### Claim 16 (depends on 15)

A slurry for an electrode mixed material layer comprising: the conductive material paste for an electrode mixed material layer according to claim 15; and electrode active material particles.

### Claim 17 (depends on 16)

The slurry for an electrode mixed material layer according to claim 16, wherein the electrode active material particles contain nickel.

### Claim 18 (depends on 16)

An electrode for an electrochemical device comprising an electrode mixed material layer formed using the slurry for an electrode mixed material layer according to claim 16.

### Claim 19 (depends on 18)

An electrochemical device comprising the electrode for an electrochemical device according to claim 18.

### Claim 20 (depends on 1)

A method of producing the composite particles for an electrochemical device according to claim 1, comprising a step of granulating a composition for composite particles that contains a core material including the melamine compound and a shell material including the inorganic material.

### Claim 21 (depends on 1)

A method of producing a binder composition for an electrochemical device functional layer comprising a step of mixing the composite particles for an electrochemical device according to claim 1, a binder for a functional layer, and a solvent.

### Claim 22 (depends on 1)

A method of producing a conductive material paste for an electrode mixed material layer comprising:
a step of mixing the composite particles for an electrochemical device according to claim 1, a binder for a functional layer, and a solvent to obtain a binder composition for an electrochemical device functional layer; and
a step of mixing the binder composition for an electrochemical device functional layer and a conductive material.