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Lithium-ion battery cathode glue and preparation method thereof

A lithium-ion battery, positive electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow dissolution speed, difficult to disperse the binder uniformly, and the molecular chain of the glue at stirring speed. Volatile, improve dissolution rate and dispersion uniformity, good uniformity

Active Publication Date: 2021-08-31
HUIZHOU HENGTAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a uniformly dispersed lithium-ion battery positive electrode glue and its preparation method, solve the problem that the binder is difficult to effectively disperse uniformly and dissolve slowly, and solve the traditional The problem that the molecular chain of the glue is broken due to the excessive stirring speed during the glue making process

Method used

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  • Lithium-ion battery cathode glue and preparation method thereof
  • Lithium-ion battery cathode glue and preparation method thereof
  • Lithium-ion battery cathode glue and preparation method thereof

Examples

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preparation example Construction

[0028] For an implementation, see figure 1 , a preparation method of lithium-ion battery positive electrode glue, comprising the following steps:

[0029] S110, adding absolute ethanol to the methylpyrrolidone solution to obtain a methylpyrrolidone ethanol solution; performing a preheating operation on the methylpyrrolidone ethanol solution, controlling the temperature of the preheating operation to be 50° C. to 70° C.; wherein, the The mass ratio of the absolute ethanol to the methylpyrrolidone solution is 2000:(0.2-1.8).

[0030] S120, performing a stirring operation on the methylpyrrolidone ethanol solution, controlling the speed of the stirring operation to be 1500rpm / min-2000rpm / min, and controlling the temperature of the stirring operation to be maintained at 50°C-70°C through a cooling operation, The methylpyrrolidone ethanol solution is kept in a stirring state, and polyvinylidene fluoride powder is added to the methylpyrrolidone solution to completely dissolve the po...

Embodiment 1

[0049] S111, adding 0.2 g of absolute ethanol to 1000 g of methylpyrrolidone solution to obtain a methylpyrrolidone ethanol solution; performing a preheating operation on the methylpyrrolidone ethanol solution, and controlling the temperature of the preheating operation to be 50° C.

[0050] S121, performing a stirring operation on the methylpyrrolidone ethanol solution, controlling the speed of the stirring operation to be 2000 rpm / min, keeping the methylpyrrolidone ethanol solution in a stirring state, and performing a cooling operation to control the temperature of the stirring operation Keep it at 50°C, add polyvinylidene fluoride powder into the methylpyrrolidone solution by adding while stirring, and control the adding speed of the polyvinylidene fluoride powder: 1000g*5% / 10=5g / min, The time for the high-speed stirring operation is controlled to be 10 minutes, so that the polyvinylidene fluoride powder is completely dissolved to obtain a premixed glue solution. Wherein, ...

Embodiment 2

[0053] S112, adding 1.8 g of absolute ethanol to 1000 g of methylpyrrolidone solution to obtain a methylpyrrolidone ethanol solution; performing a preheating operation on the methylpyrrolidone ethanol solution, and controlling the temperature of the preheating operation to be 70° C.

[0054] S122, performing a stirring operation on the methylpyrrolidone ethanol solution, controlling the speed of the stirring operation to be 1500 rpm / min, keeping the methylpyrrolidone ethanol solution in a stirring state, and performing a cooling operation to control the temperature of the stirring operation Keep it at 70°C, add polyvinylidene fluoride powder into the methylpyrrolidone solution by adding while stirring, and control the adding speed of the polyvinylidene fluoride powder: 1000g*30% / 30=10g / min, The time for the high-speed stirring operation is controlled to be 30 minutes, so that the polyvinylidene fluoride powder is completely dissolved to obtain a premixed glue solution. Wherein...

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Abstract

The invention relates to the field of lithium-ion batteries, and discloses a lithium-ion battery cathode glue and a preparation method thereof. The method comprises the following steps: adding absolute ethanol to a methylpyrrolidone solution to obtain a methylpyrrolidone ethanol solution; p-methylpyrrolidone The ethanol solution is preheated, and the temperature of the preheating operation is controlled to be 50-70°C; the methylpyrrolidone ethanol solution is stirred, and the speed of the stirring operation is controlled to be 1500-2000rpm / min, and the stirring temperature is controlled to maintain the preheating temperature. Keep the methylpyrrolidone ethanol solution in a stirring state, add polyvinylidene fluoride powder to the methylpyrrolidone solution, so that the polyvinylidene fluoride powder is completely dissolved, and obtain a premixed glue; ultrasonically stir the premixed glue to obtain Lithium-ion battery cathode glue. This method can solve the problem that the binder is difficult to effectively disperse evenly and the dissolution rate is slow, and solve the problem that the molecular chain of the glue is interrupted due to excessive stirring speed in the traditional glue making process.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery anode glue and a preparation method thereof. Background technique [0002] Due to the advantages of high voltage and energy density, long cycle life, high energy efficiency, small self-discharge, no memory effect, and no pollution, lithium-ion batteries have become the most influential and competitive secondary batteries. Lithium-ion batteries have been widely used in portable consumer electronics, such as smartphones, laptops, digital cameras, and power tools; And other application fields have been widely used. The manufacturing process of lithium-ion batteries mainly includes gluing, pulping, sheet production, assembly, liquid injection, and chemical formation. Among them, gluing the positive and negative electrodes is the first step in the production of lithium batteries. The quality of the gluing liquid directly affects the quality of the battery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/623H01M10/0525Y02E60/10
Inventor 戴建勇黄锐升刘志伟曾贤华
Owner HUIZHOU HENGTAI TECH
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