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Binder for lithium battery and preparation method thereof

A binder and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in binder modulation, influence on battery characteristics such as rate and cycle performance, and high cost, and improve stability , Excellent plasticity, high rate effect

Active Publication Date: 2015-11-04
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For batteries using this binder, due to the precipitation of polymers, the battery characteristics such as rate performance and cycle performance are greatly affected, and the preparation of the binder is difficult, and the manufacturing cost is relatively high.

Method used

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  • Binder for lithium battery and preparation method thereof
  • Binder for lithium battery and preparation method thereof
  • Binder for lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of binder for lithium ion battery of the present invention is as follows:

[0027] The high molecular polymer A containing the carboxyl functional group and the high molecular polymer B containing the hydroxyl functional group are respectively stirred and dissolved in a container, and then according to the mass percentage, the high molecular polymer A containing the carboxyl functional group accounts for 59-94%, and the high molecular polymer B containing the hydroxyl functional group accounts for 59-94%. B accounts for 5-40% of the ratio and put it into the reactor, then add the reaction initiator C with a mass percentage of 0.5-1%, keep stirring, the stirring speed is controlled at 100~150rpm, and stir at a constant temperature of 40~70°C Cool to room temperature after 10-12 hours to prepare a lithium-ion battery water-based binder.

[0028] The temperature is raised at a rate of 1-5° C. / hour until a constant temperature of 40-70° C. is reached....

Embodiment 1

[0038] Put 10kg of anhydrous carboxyl-containing polymer A into a 50L reaction kettle, and stir and dissolve continuously.

[0039] Put 10kg of anhydrous hydroxyl-containing polymer B into a 50L reaction kettle, and continuously stir and dissolve.

[0040] Under stirring conditions, mix the 9.4kg anhydrous carboxyl-containing polymer A solution and 0.5kg anhydrous hydroxyl-containing polymer B solution after stirring and dissolving, and then add 0.1kg initiator C to oxidize dibenzoyl solution, the stirring speed is controlled at 100~110rpm.

[0041] After stirring for 3 hours, heat up at a heating rate of 5°C / hour, and finally control the temperature of the reactor at 45-50°C to react while stirring for about 12 hours, and finally cool to room temperature to obtain the binder product.

[0042] The properties of the material prepared in Example 1 were characterized. As detected by FTIR, a partial condensation reaction occurred between polymer A and polymer B. figure 2 with ...

Embodiment 2

[0045] With embodiment 1, A and B after stirring and dissolving, under stirring condition, the A solution containing 8kgA and the B solution of 1.9kgB are mixed, then add the initiator C solution containing 0.1kg peroxydicarbonate , the stirring speed is controlled at 140~150rpm.

[0046] After stirring for 2.5 hours, the temperature was raised at a heating rate of 5°C / hour, and finally the temperature of the reactor was controlled at 65-70°C to react while stirring for about 10 hours. Finally, cool to room temperature to obtain a binder product.

[0047] The binder of this embodiment has an initial discharge specific capacity of 3553 mAh / g at room temperature at a current of 4000 mA / g, and still maintains a high capacity of 2604 mAh / g after 50 weeks.

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Abstract

The invention relates to adhesive for a lithium battery and a preparation method thereof. The adhesive is aqueous and is prepared through polymer A containing carboxyl functional groups and polymer B containing hydroxyl functional groups. The preparation method includes dissolving and placing the polymer A containing the carboxyl functional groups and the polymer B containing the hydroxyl functional groups in a reactor in proportion, then adding reaction initiator C to stir without a break for 10 to 12 hours at the constant temperature ranging from 40 to 70 DEG C, and cooling to the room temperature to obtain the adhesive. The adhesive has high-strength adhesion and excellent plasticity, prepared slurry can be preserved for long time without phase separation and can be mass produced, so that a battery producing process is easier and more facilitated, and consistence of battery quality can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of energy storage batteries, and relates to a preparation method of a binder for lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have the highest energy density among commercial batteries, and are widely used especially in small electronic products. Recently, people expect lithium-ion batteries to be used as power batteries in electric vehicles and energy storage devices. Therefore, lithium-ion batteries are required to have properties such as high capacity, long life, high rate capability and safety. The battery capacity is affected by the filling amount of the electrode active material. The rate property is affected by the difficulty of electron movement, so the increase of the conductive agent can improve the rate property. In the limited internal space of the battery, it is very necessary to reduce the amount of binder for the increase of electrode materials and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62C08G81/00C08G81/02
CPCY02E60/10
Inventor 周明炯
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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