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Water-based coating composition for diaphragm and water-based coating diaphragm

A water-based coating and composition technology, applied in the field of water-based coating diaphragms and water-based coating compositions, can solve problems such as thermal shrinkage of lithium-ion battery diaphragms, improve wettability and liquid absorption, increase porosity, and improve safety sexual effect

Pending Publication Date: 2021-12-03
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application provides a water-based coating composition and a water-based coating membrane for diaphragms, so as to solve the technical problem of how to avoid thermal shrinkage of lithium-ion battery diaphragms at high temperatures in the prior art

Method used

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  • Water-based coating composition for diaphragm and water-based coating diaphragm
  • Water-based coating composition for diaphragm and water-based coating diaphragm
  • Water-based coating composition for diaphragm and water-based coating diaphragm

Examples

Experimental program
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Effect test

Embodiment approach

[0045] As an embodiment, in parts by weight, the raw materials include:

[0046] Inorganic ceramic powder: 20-40 parts, solvent: 60-80 parts, additives: 2.4-6 parts.

[0047] As an embodiment, the inorganic ceramic powder includes at least one of the following: alumina, boehmite, silicon oxide, and titanium oxide.

[0048] As an embodiment, the auxiliary agent includes: binder, dispersant and thickener;

[0049] In this application, the role of the binder can be understood as a bonding effect;

[0050] The role of dispersant can be understood as dispersion;

[0051] The function of the thickener can be understood as a thickening effect.

[0052] In parts by weight, the binder is 2-5 parts, the dispersant is 0.2-0.5 parts, and the thickener is 0.2-0.5 parts.

[0053] As an implementation manner, the binder includes at least one of the following: styrene-butadiene rubber emulsion, acrylonitrile, and acrylate emulsion.

[0054] In this application,

[0055] Styrene-butadien...

Embodiment 1

[0077] 1) Take 0.15 g of CMC, add it into 16.2 g of water, and stir at 500 r / min in a magnetic stirrer to obtain a viscous solution.

[0078] 2) if figure 2 As shown, select three kinds of alumina with a particle size of 0.3um, 0.5um, and 12g in total, and the mass ratio of the three particle sizes is 2:3:1, and add it to the above-mentioned viscous solution and stir evenly;

[0079] 3) Take 0.15 g of polyacrylamide and add the solution in (2) into a ball mill tank, and ball mill at a speed of 500 r / min for 4 hours to obtain a coating slurry;

[0080] 4) Apply the above slurry to the surface of a 12um thick PE film by extrusion coating, put it in an oven at 60°C for 6 hours and dry it to obtain a water-based coated separator.

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Abstract

The invention relates to a water-based coating composition for a diaphragm and a water-based coating diaphragm, and belongs to the field of fuel cells. According to the water-based coating composition for the diaphragm provided by the invention, the particle size range of inorganic ceramic powder is in multi-stage stepped distribution, so that the components of coating slurry are more uniform, the particle size distribution range of the coating inorganic ceramic powder is favorably enlarged, the coating is more uniform, the porosity of a coating layer is increased, the wettability, the liquid absorption rate, the puncture resistance and the thermal stability of the inorganic ceramic powder to a polar electrolyte are effectively improved, and the safety of a lithium battery is improved.

Description

technical field [0001] The application belongs to the field of fuel cells, and in particular relates to a water-based coating composition for a diaphragm and a water-based coating diaphragm. Background technique [0002] With the advancement of science and technology, people have put forward higher requirements for the comprehensive performance of lithium-ion batteries, and the safety of lithium-ion batteries, especially the fire and explosion during rapid charging and discharging, has attracted attention. Most of the currently used battery separators are polypropylene (PP) and polyethylene (PE) microporous membranes. The thermal shrinkage of the separator at high temperatures causes the contact between the positive and negative electrodes, resulting in local rapid heat release, which poses a huge safety hazard. In addition, polyolefin separators have poor wettability to polar electrolytes and poor puncture resistance. At present, these defects have become difficulties to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0236H01M8/0243
CPCH01M8/0236H01M8/0243Y02E60/50
Inventor 龚钰刘敏胡远森王彦曹元璞
Owner DONGFENG MOTOR GRP