Preparation method for lithium ion battery negative pole slurry

A technology for lithium ion battery and negative electrode slurry, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of negative electrode powder, inability to slurry, suspension effect, poor bonding performance of binder, etc., and shorten the preparation time. , avoid battery life, improve the effect of powder drop

Inactive Publication Date: 2013-09-11
JIANGSU LITIAN NEW ENERGY 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 provide a preparation method of lithium-ion battery negative electrode slurry with a simple process, to solve the problem that a single SBR binder has poor bonding performance, easily causes negative electrode powder drop and cannot suspend the slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Weigh the raw materials according to the mass ratio of 90% carbon powder, 3% conductive agent, 4% LA133 binder, and 3% SBR.

[0013] (2) At an ambient temperature of 15-35°C, first add deionized water of the same quality as the raw materials into the stirrer, then add LA133 and stir at a low speed of 25Hz for 0.1h to dilute the cohesiveness of LA133.

[0014] (3) Add the conductive agent into the stirrer, evacuate to make the vacuum degree lower than -0.09MPa, and stir at a high speed of 35Hz for 1h.

[0015] (4) Put the carbon powder into the stirrer, and when the vacuum degree is lower than -0.09MPa, stir at a high speed of 35Hz for 3h.

[0016] (5) Add SBR to the stirrer, and when the vacuum degree is lower than -0.09MPa, stir at a high speed of 35Hz for 1h to obtain the mixture A.

[0017] (6) 1 hour before the discharge of the mixture A, add NMP accounting for 0.5% of the mass of the mixture A to adjust the viscosity, and then filter it with a filter to obtain...

Embodiment 2

[0019] (1) Weigh the raw materials according to the mass ratio of 94.5% carbon powder, 1% conductive agent, 2.5% LA133 binder, and 2% SBR.

[0020] (2) At an ambient temperature of 15-35°C, first add deionized water of the same quality as the raw material into the mixer, then add LA133 and stir at a low speed of 25Hz for 0.3h to dilute the cohesiveness of LA133.

[0021] (3) Add the conductive agent into the stirrer, evacuate to make the vacuum degree lower than -0.09MPa, and stir at a high speed of 35Hz for 1.5h.

[0022] (4) Put the carbon powder into the stirrer, and stir at a high speed of 35Hz for 4h when the vacuum degree is lower than -0.09MPa.

[0023] (5) Add SBR to the stirrer, and when the vacuum degree is lower than -0.09MPa, stir at a high speed of 35Hz for 1.5h to obtain the mixture A.

[0024] (6) 1.5 hours before the discharge of mixture A, add NMP accounting for 0.7% of the mass of mixture A, and when the vacuum degree is lower than -0.09MPa, stir at a high s...

Embodiment 3

[0026] (1) Weigh the raw materials according to the mass ratio of 93.5% carbon powder, 2% conductive agent, 3.5% LA133 binder, and 1% SBR.

[0027] (2) At an ambient temperature of 15-35°C, first add deionized water of the same quality as the raw material into the mixer, then add LA133 and stir at a low speed of 25Hz for 0.3h to dilute the cohesiveness of LA133.

[0028] (3) Add the conductive agent into the stirrer, evacuate to make the vacuum degree lower than -0.09MPa, and stir at a high speed of 35Hz for 1.5h.

[0029] (4) Put the carbon powder into the stirrer, and stir at a high speed of 35Hz for 4h when the vacuum degree is lower than -0.09MPa.

[0030] (5) Add SBR to the stirrer, and when the vacuum degree is lower than -0.09MPa, stir at a high speed of 35Hz for 1.5h to obtain the mixture A.

[0031] (6) 1.5 hours before the discharge of mixture A, add NMP accounting for 0.8% of the mass of mixture A, and when the vacuum degree is lower than -0.09MPa, stir at a high s...

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PUM

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Abstract

The invention discloses a preparation method for a lithium ion battery negative pole slurry. The preparation method comprises the following steps: adding solid raw materials comprising, by mass, 90 to 95% of powdered carbon, 1 to 3% of a conductive agent, 1 to 4% of a binder LA133 and 1 to 3% of SBR into deionized water in an environment with a temperature of 15 to 35 DEG C, wherein a mass ratio of the solid raw materials to the deionized water is 1:1; carrying out vacuum-pumping and then stirring in a stirrer for 5.1 to 9.4 h so as to obtain a mixture A; and adding NMP accounting for 0.5 to 1% of the mass of the mixture A 1 to 2 h before discharging of the mixture A and carrying out filtration so as to obtain the negative pole slurry. According to the invention, since a CMC glue solution does not need to be prepared in advance, preparation time for the slurry is shortened, the problem of dusting of a negative pole piece is overcome, and thus, self-discharge of a battery is mitigated, and influence on the service life of the battery resulting from introduction of sodions by CMC is avoided.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode slurry of a lithium ion battery, belonging to the technical field of lithium ion battery manufacturing. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high specific energy, long cycle life, low self-discharge, and environmental protection, and are widely used in mobile electronic terminal equipment, electric vehicles, and energy storage equipment. Lithium-ion battery negative electrode material is one of the key materials for manufacturing lithium-ion batteries, but the production cost of negative electrode materials for oily systems is relatively high. Therefore, in order to reduce the manufacturing cost of lithium-ion batteries, currently, negative electrode materials generally use water-based systems. [0003] The raw materials used to prepare the aqueous negative electrode slurry for lithium-ion batteries are mainly graphite, SBR (st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/62
CPCY02E60/10
Inventor 任大卫吴军陆春海
Owner JIANGSU LITIAN NEW ENERGY TECH
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