# US 2013/0157136 A1 · Coating of disordered carbon active material using water-based binder slurry

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- Number: US 2013/0157136 A1
- Document ID: US20130157136A1
- Status: Published application
- Kind: A1
- Application number: 13/327,353
- Filed: 2011-12-15
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Enerdel, Inc.
- Inventors: Mark Balicki
- Web page: https://patentgrep.com/patent/US20130157136A1

## CPC

- H01M 4/622: {being polymers}
- C08L 9/02: Copolymers with acrylonitrile
- C09J 101/286: {substituted with acid radicals (C09J101/282 takes precedence)}
- C09J 109/06: Copolymers with styrene
- H01M 4/625: {Carbon or graphite}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10T 29/49115: including coating or impregnating
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electrochemical cell manufactured by coating a conductive substrate of an electrode with a disordered carbon active material using a water-based binder slurry. An exemplary binder slurry includes at least one disordered carbon material, carboxymethyl cellulose (CMC), styrene butadiene rubber (SBR), and water.

## Claims

### Claim 1

A water-based binder slurry used to produce an electrode of an electrochemical cell, the binder slurry comprising:
at least one disordered carbon material;
at least one binder; and
water.

### Claim 2 (depends on 1)

The binder slurry of claim 1, wherein the at least one binder comprises carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR).

### Claim 3 (depends on 2)

The binder slurry of claim 2, wherein the at least one disordered carbon material is present in the water at about 96 wt. %, the CMC is present in the water at about 2 wt. %, and the SBR is present in the water at about 2 wt. %.

### Claim 4 (depends on 2)

The binder slurry of claim 2, wherein the at least one disordered carbon material, the CMC, and the SBR, together, comprise between about 40 wt. % and 60 wt. % of the binder slurry, with the water making up the balance of the binder slurry.

### Claim 5 (depends on 2)

The binder slurry of claim 2, wherein the binder slurry consists essentially of the at least one disordered carbon material, the CMC, the SBR, and the water.

### Claim 6 (depends on 2)

The binder slurry of claim 2, wherein the CMC in the binder slurry has a degree of carboxymethyl-substitution less than 0.85.

### Claim 7 (depends on 2)

The binder slurry of claim 2, wherein the CMC in the binder slurry has a degree of carboxymethyl-substitution of 0.65 to 0.75.

### Claim 8 (depends on 1)

The binder slurry of claim 1, wherein the binder slurry has a viscosity at room temperature between about 4,500 cP and 5,500 cP.

### Claim 9 (depends on 1)

The binder slurry of claim 1, wherein the at least one disordered carbon material comprises hard carbon.

### Claim 10 (depends on 1)

The binder slurry of claim 1, wherein the at least one disordered carbon material comprises soft carbon.

### Claim 11

An electrochemical cell comprising:
a cathode comprising an active layer and a conductive layer;
an anode comprising an active layer with at least one disordered carbon material and a conductive layer, the at least one disordered carbon material in the active layer of the anode being adhered to the conductive layer of the anode using a binder slurry that comprises:
carboxymethyl cellulose (CMC);
styrene butadiene rubber (SBR); and
water; and
an electrolyte in communication with the anode and the cathode.

### Claim 12 (depends on 11)

The electrochemical cell of claim 11, wherein the active layer of the anode is applied to a first side of the conductive layer of the anode at more than about 5 mg/cm2.

### Claim 13 (depends on 12)

The electrochemical cell of claim 12, wherein the active layer of the anode is applied to the first side of the conductive layer of the anode at about 10 mg/cm2.

### Claim 14 (depends on 12)

The electrochemical cell of claim 12, wherein the active layer of the anode is applied to a second side of the conductive layer of the anode opposite the first side.

### Claim 15 (depends on 11)

The electrochemical cell of claim 11, wherein the active layer of the cathode comprises LiNiCoMnO2 (NMC).

### Claim 16

A method of manufacturing an electrochemical cell, the method comprising the steps of:
preparing a binder slurry comprising:
at least one disordered carbon material;
carboxymethyl cellulose (CMC);
styrene butadiene rubber (SBR); and
water;
applying the binder slurry to a conductive substrate to form an anode; and
placing the anode in electrical communication with a cathode.

### Claim 17 (depends on 16)

The method of claim 16, wherein the preparing step comprises mixing the slurry to arrive at a viscosity at room temperature between about 4,500 cP and 5,500 cP.

### Claim 18 (depends on 16)

The method of claim 16, further comprising the step of partially drying the anode after the applying step by placing the anode in a furnace that is heated to a first temperature of about 70° C. or less.

### Claim 19 (depends on 18)

The method of claim 18, further comprising the step of fully drying the anode after partially drying the anode by placing the anode in a furnace that is heated to a second temperature higher than the first temperature.

### Claim 20 (depends on 19)

The method of claim 19, further comprising the step of pressing the anode after partially drying and before fully drying the anode.