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Preparation method of insulating paint of lithium ion battery

A technology for lithium ion batteries and insulating coatings, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slurry dispersion uniformity and poor consistency, improve uniformity, solve slurry agglomeration, and be beneficial to The effect of mass promotion of production applications

Active Publication Date: 2015-12-09
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing insulating coatings for lithium-ion batteries, thereby solving the technical problem of poor uniformity and consistency of slurry dispersion in the preparation process of existing insulating coatings for lithium-ion batteries

Method used

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  • Preparation method of insulating paint of lithium ion battery
  • Preparation method of insulating paint of lithium ion battery
  • Preparation method of insulating paint of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The preparation method of the lithium-ion battery insulating coating of the present embodiment, process flow chart is as follows figure 1 shown, including the following steps:

[0025] 1) In the mixing tank 1, gradually add carboxymethyl cellulose into water (mass ratio 1:40), and stir for 5 hours at 200 rpm to obtain a binder glue;

[0026] 2) Under the agitation of 250rpm, add the barium sulfate (median particle size is 0.5 μm) in the feeding tank 2 and the adhesive glue obtained in step 1) into the premixing mixing tank 3 for more than two times and mix them , each time after adding the insulating powder, alternately add the binder glue into the slurry premixing mixing tank 3, and the interval of alternate feeding is 10min; after the insulating powder and the binder are added, continue to stir at 300rpm 1h, the mixture was obtained;

[0027] 3) Send the mixture obtained in step 2) into the ultrasonic and high-speed shear composite dispersing device 4, set the dispe...

Embodiment 2～5

[0031] The preparation methods of the insulating coatings for lithium-ion batteries in Examples 2-5 are basically the same as those in Examples, and the specific differences are listed in Table 1 below.

[0032] The process parameter of the preparation method of table 1 embodiment 2~5 lithium-ion battery insulation coating

[0033]

[0034] The insulating coatings for lithium-ion batteries prepared in Examples 1-5 were coated on the interface between tabs and active materials, and their insulating effects were tested. The results are shown in Table 2.

[0035] Table 2 Comparison of Insulation Resistance of Insulation Coatings in Different Examples

[0036]

[0037] figure 2 Scanning electron microscope pictures of the insulating coating for lithium-ion batteries prepared in Example 1 of the present invention. Depend on figure 2 It can be seen that the coating particles are evenly distributed and have high consistency.

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Abstract

The invention discloses a preparation method of insulating paint of a lithium ion battery. The preparation method comprises the following steps of (1) adding a binding agent into a solvent, and mixing to obtain a binding agent glue solution; (2) alternately adding insulating powder and the obtained binding agent glue solution into a container respectively by more than two times for mixing in a stirring condition, and obtaining a mixture; (3) performing high-speed shear dispersion on the mixture under the action of ultrasound, wherein the ultrasound power is 5 to 30 kw, and the rotating speed of the high-speed shear dispersion is 3500 to 6000 rpm, so as to obtain dispersed paste; (4) performing ball milling on the dispersed paste, and then defoaming and filtering to obtain the insulating paint. According to the preparation method, multistep feeding, ultrasound and high-speed shear composite dispersion and the ball milling of the paste are adopted, so that the problems of paste agglomeration, difficulty in dispersion and the like caused by large specific area and easiness in water absorption of nanoscale powder in the process of preparing the insulating paint of an existing lithium ion battery can be effectively solved, and the dispersion uniformity and the consistency of the insulating paint are increased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of an insulating coating for lithium ion batteries. Background technique [0002] Lithium-ion power batteries have the advantages of high energy density, high working voltage, no memory effect, long cycle life, and no pollution to the environment. They have been widely used in many fields such as electric vehicles, energy storage power stations, and notebook computers. [0003] In the production process of lithium-ion batteries, some burrs will be formed on the edge and surface after the positive active material and the negative active material are cured, especially the burrs at the edge are easy to scratch the separator, thereby causing the internal short circuit of the battery; in addition, due to The connection between positive and negative electrodes and tabs is thicker than other parts of the electrode, and this part is also eas...

Claims

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Application Information

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IPC IPC(8): C09D5/25C09D7/12H01M4/139H01M10/0525
CPCY02E60/10
Inventor 张国军王海文张海峰怀永建
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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