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Water-soluble adhesive for lithium ion battery, preparation method for water-soluble adhesive, electrode sheet and battery

A lithium-ion battery, water-soluble technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of general CMC viscosity, capacity loss, high price, etc., and achieves simple preparation method and bonding strength. The effect of improving and good slurry stability

Active Publication Date: 2020-05-12
浙江研一新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using PVDF as a binder, the organic solvents used to dissolve PVDF, such as nitrogen methyl pyrrolidone NMP, are harmful to the environment and human body, and are expensive
When SBR is used as a binder, cellulose CMC must be added as a thickener at the same time, but CMC is generally viscous, brittle, and poor in flexibility, and the electrode sheet is easy to crack when charging and discharging.
At the same time, SBR as a binder electrolyte swells greatly, and when it is applied to graphite anodes and silicon-based new anodes based on the point-point bonding mechanism, the volume of graphite anodes and silicon-based anodes repeatedly expands and shrinks during charge and discharge cycles. The binder is very easy to lose its cohesiveness, resulting in capacity loss, especially the deterioration of high temperature storage and high temperature cycle performance

Method used

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  • Water-soluble adhesive for lithium ion battery, preparation method for water-soluble adhesive, electrode sheet and battery
  • Water-soluble adhesive for lithium ion battery, preparation method for water-soluble adhesive, electrode sheet and battery
  • Water-soluble adhesive for lithium ion battery, preparation method for water-soluble adhesive, electrode sheet and battery

Examples

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preparation example Construction

[0068] The preparation method of lithium ion battery water-soluble binder of the present invention, adopts soap-free emulsion polymerization, comprises the following steps:

[0069] 1. At room temperature (20°C), put the solvent in a 2000L reactor, and in a state of stirring at a rotational speed of 100-300rpm, pass in nitrogen gas with a purity ≥ 99.9%, with a flow rate of 2000-4000L / H, and replace it for 0.5-2H , to remove water-soluble oxygen, by mass percentage: formula 1 monomer 5-75%, formula 2 monomer 1-35%, formula 3 monomer 5-65%, add to the solvent, continuously feed nitrogen, stir for 3 ~10h, mix uniformly to obtain a solution, the mass concentration of the solution is 10~30%.

[0070] The solvent is a water-miscible solvent: water, isopropanol or butanediol.

[0071] The formula 1 is: CHR 11 = CHR 12 -CN,

[0072] R 11 is H, Cl, Br or -CH 3 ,

[0073] R 12 is H, Cl, Br, -CH 3 or -C 6 h 4 -;

[0074] The formula 2 is: CHR 21 = CHR 22 -CONR 23 R 24 , ...

Embodiment 1

[0125] 1. Add 350 parts of pure water to the reaction kettle, stir at 100 rpm, feed nitrogen with a flow rate of 2000L / H, remove water-soluble oxygen for 1.5 hours, then add 55 parts of formula 1 monomer acrylic acid, 5 parts of formula 2 monomer N , N-diethylacrylamide, 40 parts of formula 3 monomer acrylonitrile, continuously blowing nitrogen, stirring for 3 hours, to obtain a solution.

[0126] 2. Continuously feed nitrogen, heat up the solution to 55°C at a heating rate of 1°C / min, add 0.5 parts by mass fraction (10%) of the initiator solution benzoyl peroxide, initiate the reaction for 10 hours, and obtain the polymerized product .

[0127] 3. Decompress the polymerization product at 60° C. with a vacuum pump until the vacuum degree is lower than 0.1 MPa, and remove the residual monomers of formula 1, formula 2 and formula 3.

[0128] 4. Neutralize the polymerized product at 50° C. with a lithium hydroxide alkaline aqueous solution to a pH of 7.5 to obtain a viscous wate...

Embodiment 2

[0132] 1. Add 350 parts of pure water to the reaction kettle, stir at 300rpm, feed nitrogen gas with a flow rate of 4000L / H, remove water-soluble oxygen for 2 hours, then add 55 parts of formula 1 monomer acrylonitrile, 5 parts of formula 2 monomer N,N-diethylacrylamide, 40 parts of formula 3 monomer sodium acrylate, continuously blowing nitrogen, stirring for 10 hours, to obtain a solution.

[0133] 2. Continuously feed nitrogen, heat the solution to 55°C at a heating rate of 2°C / min, add 0.5 parts by mass fraction (10%) of the initiator solution dicumyl peroxide, initiate the reaction for 10 hours, and obtain polymerization product.

[0134] 3. The polymerization product is depressurized at 80° C. with a vacuum pump until the vacuum degree is lower than 0.1 MPa, and the residual monomers of formula 1, formula 2 and formula 3 are removed.

[0135] 4. Neutralize the polymerized product with aqueous sodium hydroxide alkali solution to pH 7.5 at 80° C. to obtain a viscous water...

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Abstract

The invention discloses a water-soluble adhesive for a lithium ion battery, a preparation method for the water-soluble adhesive, an electrode sheet and a battery. The invention is to solve the technical problems of improving the high-temperature storage and high-temperature cycle performance of the lithium ion battery and reducing the cost. The water-soluble adhesive for the lithium ion battery provided by the invention comprises, in percentages by mass, 5-75% of a monomer as shown in a formula 1 which is described in the specification, 1-35% of a monomer as shown in a formula 2 which is described in the specification and 5-65% of a monomer as shown in a formula 3 which is described in the specification, wherein the monomers constitute a multipolymer. The method provided by the invention comprises the following steps: mixing the monomer as shown in the formula 1, the monomer as shown in the formula 2 and the monomer as shown in the formula 3 so as to obtain a solution, adding an initiator so as to obtain a polymerization product, and carrying out neutralizing with an aqueous alkali solution so as to obtain the water-soluble adhesive for the lithium ion battery. The invention relates to a lithium ion battery electrode sheet, a lithium ion battery and a lithium ion battery water-soluble adhesive. Compared with the prior art, the water-soluble adhesive provided by the invention has good dispersing performance and slurry stability, facilitates improving the bonding strength, is endowed with certain high-temperature resistance due to a low electrolyte swelling characteristic, and is simple in preparation method and low in cost.

Description

technical field [0001] The invention relates to a lithium ion battery material and a preparation method thereof, as well as an electrode pole piece and a battery, in particular to a lithium ion secondary battery binder and a preparation method thereof, an electrode pole piece using the binder and a lithium ion battery. Battery. Background technique [0002] Currently, lithium-ion batteries are considered to be the most promising mobile energy storage batteries in mobile electronics, electric vehicle industry, and other circular energy systems. Commonly used binders for lithium-ion batteries are polyvinylidene fluoride PVDF and styrene-butadiene emulsion SBR binders. Using PVDF as a binder, the organic solvent used to dissolve PVDF, such as nitrogen methyl pyrrolidone NMP, is harmful to the environment and human body, and is expensive. When SBR is used as a binder, cellulose CMC must be added as a thickener at the same time, but CMC is generally viscous, brittle, and poor i...

Claims

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Application Information

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IPC IPC(8): C09J133/02C09J133/20C08F220/06C08F220/54C08F220/48C08F220/56C08F220/58H01M4/62H01M4/13H01M10/0525
CPCC08F220/06C08F220/48C09J133/24C09J133/26H01M4/13H01M4/622H01M10/0525C08F220/54C08F220/56Y02E60/10
Inventor 刘俊岳敏黄绵彬王伟华梁华晴吴家亮
Owner 浙江研一新能源科技有限公司
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