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Functional diaphragm and preparation method thereof

A diaphragm and functional technology, applied in the field of functional diaphragm and its preparation, can solve the problems of battery deformation, large expansion and contraction rate, and easy bulging of batteries

Active Publication Date: 2019-03-26
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of the battery cell is getting higher and higher, and the expansion and contraction rate of the electrode during the charging and discharging process is also relatively large. It will be very easy to bulge, which will eventually cause the battery to deform and cause the battery cell to be scrapped

Method used

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  • Functional diaphragm and preparation method thereof
  • Functional diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a functional diaphragm, the preparation steps of which are as follows:

[0042] Dissolve 10g polysulfone ether ketone resin and 5g polyvinylidene fluoride-hexafluoropropylene resin in 60g N,N-dimethylformamide, then add 4g 4wt% ethanol and 0.01g photoinitiator TPO, stir at high speed for 30 Minutes, evenly, let it stand for degassing. The resulting slurry is sprayed on the surface of a dry-process polypropylene base film with a thickness of 16 microns and a porosity of 40% through a high-speed rotating spray disc, and then undergoes UV pre-curing (pre-curing time 1s), gel washing with water, and UV light curing. (curing time 5s). Finally dry to obtain coating thickness is 3 microns, and the single island-shaped particle (being single island-shaped coating) size is the function of 200-400 micron (island-shaped particle size is different, so what is given in the embodiment is a range value) function diaphragm. The coverage area of ​​the coating...

Embodiment 2

[0044] This embodiment provides a functional diaphragm, the preparation steps of which are as follows:

[0045] Dissolve 10 g of photocurable polyacrylate resin, 10 g of polyester acrylate and 10 g of gel-type polyacrylate resin with active functional groups in a mixed solution of 40 g of acetone and 40 g of toluene. Add 5 g of deionized water, 5 g of 8 wt % ethylene glycol and 0.1 g of photoinitiator α, α-dimethoxy-α-phenylacetophenone, stir at high speed for 30 minutes, and let it stand for defoaming. The resulting slurry is sprayed on the surface of a dry-laid non-woven fabric base film with a thickness of 12 microns and a porosity of 45% through a high-speed rotating spray disc. After UV pre-curing (pre-curing time 1s), gel washing and pore making, UV light curing (curing time 5s). Finally, dry to obtain a functional separator with a coating thickness of 5 microns and a single island particle size of 100-200 microns. The coverage area of ​​the coating on the base film is...

Embodiment 3

[0047] This embodiment provides a functional diaphragm, the preparation steps of which are as follows:

[0048] 5g photocurable urethane acrylate resin, 6g polyether acrylate, 4g photocurable polybutadiene oligomer resin and 8g PVDF-HFP (copolymer of vinylidene fluoride and hexafluoropropylene) gel resin were dissolved in 20g NMP ( N,N-dimethylpyrrolidone), 10g p-xylene and 40g formamide in a mixture. Then add 1g methanol, 2g ether, 3g dichloromethane and 0.0025g photoinitiator 2,4-dihydroxybenzophenone, 0.0035g photoinitiator α, α-dimethoxy-α-phenylacetophenone , 0.02g photoinitiator TPO, stirred at high speed for 30 minutes, evenly, and let it stand for defoaming. The resulting slurry is sprayed on the surface of the wet-process PE-ceramic base membrane with a thickness of 12 microns and a porosity of 45% through a high-speed rotating spray disc. After UV pre-curing (pre-curing time 1s), hot air baking, UV light curing (curing time 5s). Finally, dry to obtain a functional...

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Abstract

The invention provides a functional diaphragm and a preparation method thereof, and relates to the technical field of lithium ion battery production. The functional diaphragm comprises a base film anda coating, wherein the base film comprises one or more of a polyolefin film, a polyolefin ceramic coating film, a non-woven fabric and a polyimide film; the coating is formed on the base film and isdistributed on the base film in the shape of an island; the coating is prepared from the following raw materials according to the parts by weight: 10-20 parts of photocurable resin, 5-10 parts of gelresin with an active functional group, 60-80 parts of main solvent, 4-10 parts of cosolvent and 0.01-0.1 part of photoinitiator. The preparation method of the functional diaphragm comprises the following steps of: applying a mixture of the photocurable resin, the gel resin with the active functional group, the main solvent, the cosolvent and the photoinitiator to the base film, and ensuring that the formed coating is distributed on the base film in the shape of island during applying. After applying, the functional diaphragm is subjected to UV pre-curing, pore-forming and UV curing in sequence. The functional diaphragm can solve the problem of battery bulging.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a functional diaphragm and a preparation method thereof. Background technique [0002] As the energy density of lithium-ion power batteries continues to increase, safety issues have become the primary issue that needs to be addressed in battery design. Especially when the energy density of a single battery reaches 300Wh / kg, the traditional polyolefin-based film and ceramic coating film are difficult to meet the requirements of battery applications, and the polymer-coated separator has a great contribution to the structural design of the battery. To a certain extent, the safety performance and battery life of the battery have been improved, and it has become the first choice for applications. At present, there are three types of power battery cells: square, soft pack and cylindrical. Among them, square cells using winding technology are more widely used by ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/058H01M50/403H01M50/414H01M50/449H01M50/489
CPCH01M10/0525H01M10/058H01M50/403H01M50/411H01M50/449Y02E60/10Y02P70/50
Inventor 曹江陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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