Coating method of lithium battery diaphragm, lithium battery diaphragm and lithium battery

A diaphragm and coating technology, which is applied in the direction of secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve the problems of high voltage resistance, poor stability of lithium battery diaphragms, etc., and achieve improved energy density and small shrinkage , the effect of small value-added ventilation

Inactive Publication Date: 2020-10-30
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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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 lithium battery separator with low shrinkage rate, small deformability, good stability and uniform pore size under high temperature for the problems of poor stability and high pressure resistance of the lithium battery separator in the prior art.

Method used

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  • Coating method of lithium battery diaphragm, lithium battery diaphragm and lithium battery
  • Coating method of lithium battery diaphragm, lithium battery diaphragm and lithium battery
  • Coating method of lithium battery diaphragm, lithium battery diaphragm and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A coating method for a lithium battery diaphragm, comprising the following steps:

[0039] Step 1, prepare coating slurry: weigh a certain amount of polyvinylidene fluoride and dissolve it in an organic solvent, add a binder to disperse evenly, and then add a pore-forming agent to disperse evenly; specifically, mix 18 parts of polyvinylidene fluoride with 47 Parts of acetone are mixed uniformly in proportion to obtain mixed slurry A; 4 parts of polyvinyl alcohol are added to mixed slurry A to obtain mixed slurry B; then 7 parts of ethylene carbonate are added to mixed slurry B to obtain mixed slurry Material C is the coating slurry.

[0040] Step 2, apply the coating slurry evenly on the surface of the base film to obtain a coated diaphragm; specifically, place the uniformly mixed coating slurry on the coating head, feed it with a peristaltic pump, and use a gravure roller to coat evenly Coated on the surface of the base film, and continuously coated at a speed of 45m / ...

Embodiment 2

[0047] A coating method for a lithium battery diaphragm, comprising the following steps:

[0048] Step 1, preparation of coating slurry: weigh a certain amount of aromatic fiber and dissolve it in an organic solvent, add a binder to disperse evenly, and then add a pore-forming agent to disperse evenly; specifically, mix 14 parts of aromatic fiber with 53 Parts of N,N-dimethylformamide are mixed uniformly in proportion to obtain mixed slurry A; 3 parts of polyvinylpyrrolidone are added to mixed slurry A to obtain mixed slurry B; then 5 parts of ethylene carbonate are added to the mixed slurry In the slurry B, the mixed slurry C, that is, the coating slurry was obtained.

[0049] Step 2, apply the coating slurry evenly on the surface of the base film to obtain a coated diaphragm; specifically, place the uniformly mixed coating slurry on the coating head, feed it with a peristaltic pump, and use a dip coating method to uniformly Coated on the surface of the base film, and contin...

Embodiment 3

[0056] A coating method for a lithium battery diaphragm, comprising the following steps:

[0057] Step 1, prepare the coating slurry: weigh a certain amount of imide fiber and dissolve it in an organic solvent, add a binder to disperse evenly, and then add a pore-forming agent to disperse evenly; specifically, 14 parts of polyimide fiber Mix with 53 parts of N,N-dimethylformamide in proportion to obtain mixed slurry A; add 3 parts of polyvinylpyrrolidone to mixed slurry A to obtain mixed slurry B; then add 5 parts of ethylene carbonate into the mixed slurry B to obtain the mixed slurry C, that is, the coating slurry.

[0058] Step 2, apply the coating slurry evenly on the surface of the base film to obtain a coated diaphragm; specifically, place the uniformly mixed coating slurry on the coating head, feed it with a peristaltic pump, and use a dip coating method to uniformly Coated on the surface of the base film, and continuously coated at a speed of 50m / min.

[0059] Step 3...

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Abstract

The invention discloses a coating method of a lithium battery diaphragm, the lithium battery diaphragm and a lithium battery. The coating method comprises the steps of 1, preparing coating slurry; 2,uniformly coating the coating slurry on the surface of one side of a base membrane to obtain a coated diaphragm; 3, at the normal temperature of 25-30 DEG C, enabling the coated diaphragm to be subjected to 6-8 times of extraction and then subjected to 3-5 times of water washing, wherein the extract liquor is mixed liquor of water and NMP (N-methyl pyrrolidone), and in every two adjacent times ofextraction, the concentration of NMP in the extract liquor used in later extraction is 2-22 wt% less than that of NMP in extract liquor used in previous extraction; and 4, drying the coated diaphragmat the temperature of 30-65 DEG C after the extraction is finished. The lithium battery diaphragm obtained by the method is good in thermal stability.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a coating method for a lithium battery diaphragm, a lithium battery diaphragm, and a lithium battery. Background technique [0002] There are two main directions to increase the energy density of lithium-ion batteries. One is to increase the specific capacity of the active material, such as the use of high-capacity Ni materials for the positive electrode, such as NCM811. The other direction is to increase the energy density by increasing the voltage. Objective, the high-voltage cathode material will not only bring severe challenges to the electrolyte, but also have a significant impact on the stability of the separator, affecting the safety of lithium-ion batteries. [0003] Coating is an effective method to improve the safety and stability of the diaphragm. Generally speaking, the coating on the surface of the diaphragm can be divided into two categories: 1) Organic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 袁海朝徐锋王晓静苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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