# US 10,483,545 B2 · Binder for battery electrodes, and electrode and battery using same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,483,545 B2
- Document ID: US10483545B2
- Status: Granted
- Kind: B2
- Application number: 15/122,673
- Filed: 2015-03-03
- Published: 2017-03-09
- Granted: 2019-11-19
- Earliest claimed: 2014-03-04
- Assignees: Osaka Soda Co., Ltd.
- Applicants: Osaka Soda Co., Ltd.
- Inventors: Tomoyuki Yano; Miwa Nakamura; Takashi Matsuo; Yasushi Miki; Katsuhito Miura
- Web page: https://patentgrep.com/patent/US10483545B2

## CPC

- H01M 4/622: {being polymers}
- C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate}
- C08F 220/1804: {C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate}
- C08F 220/1808: {C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate}
- C08F 220/286: {and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate}
- C08F 290/06: Polymers provided for in subclass C08G
- H01G 9/042: characterised by the material (H01G11/22 takes precedence)
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C08F 220/287: {and containing polypropylene oxide in the alcohol moiety}
- H01M 10/052: Li-accumulators
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a binder for battery electrodes which includes a polymer including: structural units (1) derived from a (meth)acrylate monomer (A) having a hydroxyl group; structural units (2) derived from a polyfunctional (meth)acrylate monomer (B); and structural units (3) derived from a reactive surfactant (C). This binder is used to prepare electrodes, and produce batteries such as lithium ion secondary batteries. Provided are: an aqueous binder which has a low environmental impact, exhibits excellent binding properties, and, notably, does not cause oxidation degradation under an electrode environment; and an electrode and a battery which use said binder.

## Claims

### Claim 1

A battery electrode binder comprising a polymer comprising:
(I) structural units derived from a hydroxyl group-containing (meth)acrylate monomer (A) represented by the general formula,
wherein R1 is hydrogen or a linear or branched alkyl group having 1 to 4 carbon atoms, R2 and R3 each is hydrogen or a linear or branched alkyl group having 1 to 4 carbon atoms, and n is an integer of 1 to 30,
(II) structural units derived from a polyfunctional (meth) acrylate monomer (B), and
(III) structural units derived from a reactive surface active agent (C) which is at least one selected from a reactive anionic surface active agent, a reactive nonionic surface active agent, a reactive cationic surface active agent and a reactive amphoteric surface active agent,
wherein the reactive nonionic surface active agent is at least one selected from polyoxyalkylene alkenyl ether, polyoxyethylene alkyl propenylphenyl ether and α-hydro-ω-(1-alkoxymethyl-2-(2-propenyloxy)ethoxy)-poly(oxy-1,2-ethanediyl), and
the monomers used in the polymer do not have a carbon-carbon double bond including an aromatic carbon-carbon double bond and a carbon-carbon triple bond, other than ethylenically unsaturated double bonds contained in the (meth)acrylic group.

### Claim 2 (depends on 1)

The battery electrode binder according to claim 1, wherein the hydroxyl group-containing (meth)acrylate monomer (A) is an alkylene glycol mono(meth)acrylate having a molecular weight of 100 to 1,000.

### Claim 3 (depends on 1)

The battery electrode binder according to claim 1, wherein the polyfunctional (meth)acrylate monomer (B) is di-functional to penta-functional (meth)acrylates.

### Claim 4 (depends on 1)

The battery electrode binder according to claim 1, wherein the polyfunctional (meth)acrylate monomer (B) is a compound represented by the formula:
wherein, R11 each is, the same or different, hydrogen or a methyl group,
R12 is a penta- or less valent organic group having 2 to 100 carbon atoms, and
m is an integer of 5 or less.

### Claim 5 (depends on 1)

The battery electrode binder according to claim 1, wherein the reactive surface active agent (C) is a compound which has an ethylenically unsaturated double bond and a group exhibiting surface activity.

### Claim 6 (depends on 1)

The battery electrode binder according to claim 1, wherein the reactive surface active agent (C) is a reactive anionic surface active agent or a reactive nonionic surface active agent.

### Claim 7 (depends on 1)

The battery electrode binder according to claim 1, wherein the polymer further comprises one or both of:
(IV) structural units derived from a (meth)acrylate ester monomer (D), and
(V) structural units derived from a (meth)acrylic acid monomer (E).

### Claim 8 (depends on 7)

The battery electrode binder according to claim 7, wherein the (meth)acrylate ester monomer (D) is a compound represented by the formula:
wherein R21 is hydrogen or a methyl group, and
R22 is a hydrocarbon group having 1 to 50 carbon atoms,
and
the (meth)acrylic acid monomer (E) is a compound represented by the formula:
wherein R31 is hydrogen or a methyl group.

### Claim 9 (depends on 7)

The battery electrode binder according to claim 7, wherein the amounts of the structural units derived from the monomers (A) to (E) are (A) 10 to 90 wt %, (B) 1 to 70 wt %, (C) 0.01 to 25 wt % and (D) 0 to 70 wt % and (E) 0 to 70 wt %, based on the polymer.

### Claim 10 (depends on 1)

The battery electrode binder according to claim 1, wherein a battery is a secondary battery.

### Claim 11 (depends on 1)

A battery electrode comprising the binder according to claim 1, and an active material.

### Claim 12 (depends on 11)

A battery comprising the battery electrode according to claim 11.

### Claim 13 (depends on 6)

The battery electrode binder according to claim 6, wherein the reactive anionic surface active agent is at least one selected from the group consisting of a sulfate ester-type, a sulfonic acid-type, a carboxylic acid-type, a phosphate ester-type alkali metal salt, alkaline earth metal salt, alkanolamine salt and ammonium salt.

### Claim 14 (depends on 6)

The battery electrode binder according to claim 6, wherein the reactive anionic surface active agent is a sulfate ester-type alkali metal salt, alkaline earth metal salt, alkanolamine salt or ammonium salt.

### Claim 15 (depends on 7)

The battery electrode binder according to claim 7, wherein the polymer consists of essentially of:
the structural units (I), (II) and (III), and optionally
at least one of the structural units (IV) and (V).