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Polyacrylate water-based adhesive for electrode materials of lithium ion battery, preparation method of adhesive and electrode plates of lithium ion battery

A polyacrylate, water-based binder technology, used in battery electrodes, non-aqueous electrolyte battery electrodes, ester copolymer adhesives, etc., can solve the problem of insufficient flexibility, poor adhesion and softness of water-based adhesives , the limited effect of the expansion of the pole piece, etc., to achieve a significant effect of inhibiting expansion, adjustable flexibility, and inhibiting the expansion effect.

Active Publication Date: 2015-02-18
YANYI NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When PVDF is used, N-methylpyrrolidone (NMP) needs to be added to dissolve and then configured into a slurry. During the process of making pole pieces, the volatilization of the solvent will pollute the environment and endanger the health of the staff, and the adhesion and softness The performance is poor, and the effect of inhibiting the expansion of the pole piece is also very limited. It is difficult to improve the capacity and rate characteristics of the battery. In addition, the price of PVDF and its solvent is relatively high, which increases the cost of lithium-ion batteries.
SBR / CMC water-based binder is widely used in the market, but due to its own reasons, it is difficult to apply to the preparation of positive electrode sheets, and the price is slightly higher, so its use is limited within a certain range
[0004] CN 101457131B discloses a lithium-ion battery electrode material with an aqueous binder and a preparation method thereof. The material consists of a low-polarity polymer as a core and a high-polarity polymer as a shell, forming a core-shell that is soft on the inside and hard on the outside. However, due to the high polarity of the shell, the water-based adhesive is not flexible enough and has not been used on a large scale.

Method used

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  • Polyacrylate water-based adhesive for electrode materials of lithium ion battery, preparation method of adhesive and electrode plates of lithium ion battery
  • Polyacrylate water-based adhesive for electrode materials of lithium ion battery, preparation method of adhesive and electrode plates of lithium ion battery
  • Polyacrylate water-based adhesive for electrode materials of lithium ion battery, preparation method of adhesive and electrode plates of lithium ion battery

Examples

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Effect test

preparation example Construction

[0052] The preparation method of lithium ion battery electrode material aqueous binding agent of the present invention comprises the following steps:

[0053] (1) Dissolve all the hydrophilic monomers and 1-80% (mass fraction) of the lipophilic monomers in deionized water, fully stir at a temperature of 40-90°C, and the stirring speed is 100-500 rpm, high-purity N 2 Oxygen removal for 0.5-2.5 hours;

[0054] (2) Add 0.2 to 2% of the total mass of the hydrophilic monomer and the lipophilic monomer to initiate the polymerization reaction, and the remaining lipophilic monomer is added in batches or dropwise during the reaction, and the polymerization temperature is 50-90 ℃, the time of the polymerization reaction is 5-15 hours, the stirring speed is 100-500 rpm, after the reaction is complete, the residual monomer is removed under reduced pressure, and the filter cloth is passed through 100-400 mesh to obtain a solid content of 15-50%. Water-based binder with a viscosity of 50-...

Embodiment 1

[0057] In this example, lithium methacrylate (MALi) is used as the hydrophilic monomer, butyl acrylate (BA) is used as the lipophilic monomer, MALi:BA=80:20 (mass ratio, the same below), and 80g lithium methacrylate (MALi) and 150g of deionized water were added to the reaction kettle, stirred at 50°C until fully dissolved, the stirring speed was 300 rpm, 10g of butyl acrylate (BA) was added, and high-purity N 2 Drive oxygen for 0.5 hours, add 0.5g of ammonium persulfate, heat up to 70°C, add the remaining 10g of lipophilic monomer dropwise into the reactor, stir at 300 rpm, add 0.1g of divinylbenzene, and react for 10 hours Finally, cross 300 mesh filter cloths to obtain a water-based binder emulsion with a solid content of 40%. figure 1 It is a scanning electron micrograph of the water-based binder prepared in Example 1.

Embodiment 2

[0059] This example uses lithium methacrylate (MALi) as the hydrophilic monomer, isooctyl acrylate (EHA), and styrene (St) as the lipophilic monomer, MALi:EHA:St=40:50:10, 40g Lithium methacrylate (MALi) and 400g of deionized water were added to the reaction kettle, stirred at 60°C until fully dissolved, the stirring speed was 200 rpm, and 40g of isooctyl acrylate (EHA) and styrene (St) were added Mix raw materials, pass high-purity N 2 Drive oxygen for 1 hour, add 0.5g of ammonium persulfate, heat up to 70°C, add the remaining 20g of lipophilic monomer dropwise into the reactor, stir at 300 rpm, add 0.4g of divinylbenzene, and react for 10 hours Finally, cross 100 mesh filter cloths to obtain a water-based binder emulsion with a solid content of 20%.

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Abstract

The invention relates to a polyacrylate water-based adhesive for electrode materials of a lithium ion battery, a preparation method of the adhesive and electrode plates of the lithium ion battery. The adhesive is a cross-linked high-solid-content polyacrylate water-based adhesive; the polymer molecule chain segment of the adhesive comprises a hydrophilic segment and a lipophilic segment which are cross-linked through a cross-linking agent to form a spatial reticular structure. The electrode plates produced by the adhesive cannot fall off in charge and discharge processes, the adhesive has a relatively good adhesion effect on the positive and negative electrode materials of the lithium ion battery, and the expansion of electrode plates of graphite anode materials, especially silicon-based materials can be inhibited.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode and negative electrode material water-based binder, a preparation method and a lithium ion battery pole piece. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, computers, electric vehicles due to their high capacity, long life, many cycles, no memory effect, less self-discharge, green environmental protection, wide temperature range, high rate and safety. Bicycles and electric cars etc. The volume expansion of the positive and negative pole pieces of the battery during charging and discharging will affect the performance of the lithium-ion battery. At present, reducing the expansion rate of pole pieces is one of the research hotspots, and the development of low-expansion graphite negative electrodes is urgent, and binders are an effective means to solve the expansion of graphite negative electrodes. ...

Claims

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Application Information

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IPC IPC(8): C09J133/02C09J133/08C09J125/08C09J133/10C08F220/06C08F220/16C08F212/36C08F212/08C08F222/38C08F220/56C08F226/06C08F216/12H01M4/62H01M4/13
CPCY02E60/10
Inventor 黄书任建国岳敏黄友元
Owner YANYI NEW ENERGY TECH CO LTD
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