Diaphragm coating liquid, preparation method thereof, diaphragm, preparation method of diaphragm, and secondary battery

A production method and technology of coating liquid, applied in battery pack parts, circuits, electrical components and other directions, can solve the problems of low stability of the diaphragm, safety problems, high thermal shrinkage rate, etc., and achieve good thermal shrinkage performance, Improved performance and reduced thermal shrinkage

Active Publication Date: 2019-06-07
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the stability of the separator is not high, and the thermal shrinkage rate is large, which may easily cause a short circuit of the battery and cause safety problems

Method used

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  • Diaphragm coating liquid, preparation method thereof, diaphragm, preparation method of diaphragm, and secondary battery
  • Diaphragm coating liquid, preparation method thereof, diaphragm, preparation method of diaphragm, and secondary battery
  • Diaphragm coating liquid, preparation method thereof, diaphragm, preparation method of diaphragm, and secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0107] This embodiment provides a method for preparing a diaphragm coating solution, comprising the following steps:

[0108] (1) Dry 75g of polyetherimide at a temperature of 110°C for 3 hours, and then dissolve the dried polyetherimide in 1.92L of N-methylpyrrolidone at a temperature of 50°C to obtain Polyetherimide solution;

[0109](2) Add 30 g of polyvinylidene fluoride powder to the polyetherimide solution, stir until dissolved, then add 150 g of dimethyl carbonate, and stir until the precipitated polyetherimide is dissolved to obtain the first dispersion;

[0110] (3) Add 1.5g of vinyl bisstearamide to 300mL of N-methylpyrrolidone, stir evenly, then add 450g of alumina particles, and fully disperse to obtain the second dispersion;

[0111] (4) Mix the first dispersion liquid with the second dispersion liquid, stir until uniform to obtain a mixed liquid, then filter the mixed liquid (80-120 mesh sieve) and discharge to obtain a diaphragm coating liquid;

[0112] Wherei...

Embodiment 2

[0114] This embodiment provides a method for preparing a diaphragm coating solution, comprising the following steps:

[0115] (1) Dry 300g of polyetherimide at a temperature of 150°C for 2 hours, and then dissolve the dried polyetherimide in 600mL of dimethylacetamide at a temperature of 60°C to obtain a polyetherimide Ether imide solution;

[0116] (2) Add 90 g of polyvinylpyrrolidone powder into the polyetherimide solution, stir until dissolved, then add 450 mL of ethyl acetate, and stir until the precipitated polyetherimide is dissolved to obtain the first dispersion;

[0117] (3) Add 90g of oxidized polyethylene wax to 600mL of N-methylpyrrolidone, stir evenly, then add 900g of barium titanate particles, and fully disperse to obtain the second dispersion;

[0118] (4) Mix the first dispersion liquid with the second dispersion liquid, stir until uniform to obtain a mixed liquid, then filter the mixed liquid (80-120 mesh sieve) and discharge to obtain a diaphragm coating li...

Embodiment 3

[0121] This embodiment provides a method for preparing a diaphragm coating solution, comprising the following steps:

[0122] (1) Dry 240g of polyetherimide at a temperature of 130°C for 4 hours, and then dissolve the dried polyetherimide in 1.4L of dimethylacetamide at a temperature of 80°C to obtain Polyetherimide solution;

[0123] (2) Add 60 g of polyvinyl alcohol powder to the polyetherimide solution, stir until dissolved, then add 300 g of dimethyl phosphate, and stir until the precipitated polyetherimide is dissolved to obtain the first dispersion;

[0124] (3) Add 30g of vinylbisstearamide to 400mL of dimethyl phthalate, stir evenly, then add 600g of silica particles, and fully disperse to obtain the second dispersion;

[0125] (4) Mix the first dispersion liquid with the second dispersion liquid, stir until uniform to obtain a mixed liquid, then filter the mixed liquid (80-120 mesh sieve) and discharge to obtain a diaphragm coating liquid;

[0126] Among them, the q...

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Abstract

The invention belongs to the technical field of secondary batteries, and relates to a diaphragm coating liquid, a preparation method thereof, a diaphragm, a preparation method of the diaphragm, and asecondary battery. The preparation method of the diaphragm coating liquid provided by the invention comprises the following steps: providing first dispersion liquid formed by polyetherimide solution,a binder and a pore-forming agent; providing second dispersion liquid formed by inorganic particles, a dispersing agent and an organic solvent; mixing the first dispersion liquid and the second dispersion liquid, and performing separating to obtain the diaphragm coating liquid. According to the invention, the method can maintain the original stability of the polyetherimide solution to the maximumextent, and meanwhile, the method enables the diaphragm coating liquid to have good thermal shrinkage performances through the adding of the inorganic particles. The diaphragm coating liquid preparedby the method can improve the performance of a base membrane on the whole. In addition, the invention also provides the diaphragm containing the diaphragm coating liquid, a manufacturing method of thediaphragm and the secondary battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a diaphragm coating solution and a manufacturing method thereof, a diaphragm and a manufacturing method thereof, and a secondary battery. Background technique [0002] The separator is a porous film used to separate the positive and negative poles in the battery, allowing only certain ions to pass through. In the structure of the battery, the separator is one of the most critical materials. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] In the prior art, the stability of the diaphragm is not high, and the thermal shrinkage rate is large, which may easily cause a short circuit of the battery a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCY02E60/10
Inventor 徐锋袁海朝李腾苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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