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Water-based adhesive and preparation method thereof, as well as battery

An adhesive, water-based technology, applied in the direction of acid copolymer adhesives, battery electrodes, adhesive types, etc., can solve the problems of narrow stable pH range, poor emulsion stability, poor adhesion, etc.

Inactive Publication Date: 2017-02-15
BAIC MOTOR CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the poor adhesion between the adhesive and the electrode in the related art, the active material is easy to fall off and powder during the cutting, chemical formation and charging and discharging process of the substrate, and the stability of the emulsion is poor, which affects the uniformity and dimensional stability of the electrode. The solvent has Certain toxicity and flammability have an impact on the working conditions of battery workers, and the problem that it can only be used in alkaline solutions and has a narrow stable pH range. The inventors have conducted in-depth research and found that the use of non-ionic thickeners can make the glue The liquid is more stable, and the polypropylene emulsion with carboxyl group is used as the main body of the adhesive to obtain good adhesion after curing, good water resistance and strong electrode size

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Formula: 55 parts of polyacrylic acid emulsion, 0.23 parts of thickener hydroxymethyl propyl cellulose, 4.7 parts of conductive agent carbon black, 0.23 parts of drag reducer polyethylene oxide, 44.84 parts of water.

[0029] Preparation method: Dissolve polyoxyethylene and hydroxymethylpropyl cellulose in water first, add polyacrylic acid emulsion, conductive agent carbon black after completely dissolving, and stir well to obtain an adhesive.

[0030] Using the above-mentioned adhesive, lithium iron phosphate as the anode material, and nano-graphite as the cathode material, the lithium battery has stable electrode dimensions. After soaking in the electrolyte for 24 hours, the film swelling rate is 0.72%. The prepared 5Ah sample battery has a capacity of 5560mAh, and after 300 charge-discharge cycles, the capacity remains 91.4%.

Embodiment 2

[0032] Formula: 45 parts of polyacrylic acid emulsion, 0.50 parts of thickener hydroxymethyl propyl cellulose, 3.0 parts of conductive agent carbon black, 0.10 parts of drag reducer polyethylene oxide, 56.40 parts of water.

[0033] Preparation method: with embodiment 1.

[0034] Using the above-mentioned adhesive, lithium iron phosphate as the anode material, and nano-graphite as the cathode material, the lithium battery has a stable electrode size. After soaking in the electrolyte for 24 hours, the film swelling rate is 0.96%. The prepared 5Ah sample battery has a capacity of 5345mAh, and after 300 charge-discharge cycles, the capacity remains 86.3%.

Embodiment 3

[0036] Formula: 65 parts of polyacrylic acid emulsion, 0.10 parts of thickener hydroxymethyl propyl cellulose, 5.0 parts of conductive agent carbon black, 0.50 parts of drag reducer polyethylene oxide, 34.40 parts of water.

[0037] Preparation method: with embodiment 1.

[0038]Using the above-mentioned adhesive, lithium iron phosphate as the anode material, and nano-graphite as the cathode material, the lithium battery has stable electrode dimensions. After soaking in the electrolyte for 24 hours, the film swelling rate is 0.70%. The prepared 5Ah sample battery has a capacity of 54760mAh, and after 300 charge-discharge cycles, the capacity remains 90.4%.

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PUM

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Abstract

The invention provides a water-based adhesive and a preparation method thereof, as well as a battery. The water-based adhesive is prepared from polypropylene emulsion with carboxyl, a non-ionic thickening agent, a conductive agent, a resistance reducing agent and water. The adhesive does not contain toxic volatile organic solvents; the water is used as a medium, so that the physical environment is friendly, and the adhesive is safe to a worker; glue formed by the non-ionic thickening agent is high in stability; furthermore, by adoption of the polypropylene emulsion with carboxyl, the adhesive has reaction activity; after the adhesive is cured, an electrode is high in size stability.

Description

technical field [0001] The invention relates to the technical field of batteries, specifically, lithium batteries for power vehicles, and more specifically, water-based adhesives, preparation methods thereof, and batteries. Background technique [0002] With the rapid development of new energy vehicles in my country, the demand for lithium batteries is increasing, and the technical requirements are also stricter. The preparation of battery electrodes is the most critical factor. The composition and preparation process of electrode materials are not only related to the electric energy storage capacity of the battery, There is also the cycle number and service life of the battery. The original glue used in the negative electrode of the power lithium battery is polyvinylidene fluoride dissolved in an organic solvent. This kind of glue has poor adhesion to the negative electrode, and the active material is easy to fall off and fall off during the cutting, forming, and flushing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/02C09J11/04C09J11/08H01M4/62
CPCC08K2201/001C08L2203/20C08L2205/03C09J11/04C09J11/08C09J133/02H01M4/622C08L1/284C08L71/02C08K3/04Y02E60/10
Inventor 姜鲁宁潘强房振飞
Owner BAIC MOTOR CORP LTD
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