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Lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve problems such as leakage of lithium-ion battery separators

Inactive Publication Date: 2021-08-31
HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a lithium-ion battery separator for the deficiencies in the prior art, which can solve the problem of leak coating of the lithium-ion battery separator, and can also monitor the consistency of the coating, which helps to improve the quality of inspection. s efficiency

Method used

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  • Lithium ion battery diaphragm and preparation method thereof
  • Lithium ion battery diaphragm and preparation method thereof
  • Lithium ion battery diaphragm and preparation method thereof

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Embodiment approach 1

[0034] Lithium-ion battery separator, comprising base material 1 and the coating that is arranged on the surface of base material 1, coating comprises ceramic coating 2, polymer coating 3; Multilayer ceramic coating 2 is arranged on one side of base material 1, Two layers of polymer coatings 3 are respectively provided on the surface of the ceramic coating 2 and the other side of the substrate 1 , the ceramic coating 2 is provided with a first dyeing agent 21 , and the polymer coating 3 is provided with a second dyeing agent 31 .

[0035]Since the conventional isolation film is coated with single-layer or multi-layer ceramics, polymer slurry or ceramic-polymer mixed slurry on the base film substrate, the color of the ceramic coating 2 and the polymer slurry is close to that of the base film itself, all of which are milky white , due to human factors or equipment failure, it is difficult to observe with the naked eye when there is leakage in the coating process, and when the lea...

Embodiment approach 2

[0041] The difference from Embodiment 1 is that the coating in this embodiment is a ceramic polymer hybrid coating, and the ceramic polymer hybrid coating is arranged on at least one side of the substrate 1, and the ceramic polymer hybrid coating is provided with a third coloring agent, The third dyeing agent is coated on the surface of the ceramic polymer mixed coating, and the ceramic polymer mixed coating includes SiO2, Al2O3, CaO, TiO2, MgO, ZnO, SnO2, ZrO2, AlOOH, MgOH2, BaSO4, PVDF, PMMA At least one, the ceramic polymer hybrid coating has a thickness of 0.2um-10um. Specifically, at least one of SiO2, Al2O3, CaO, TiO2, MgO, ZnO, SnO2, ZrO2, AlOOH, MgOH2, BaSO4, PVDF, and PMMA is used as the main material of the ceramic-polymer hybrid coating, at 10-40 ° C, Under the condition of ambient humidity of 30-75%, add binder, CMC, dyeing agent, etc. in a certain order, and mix at high speed with a double planetary mixer and grind with a pin-type sand mill to prepare a viscosity ...

Embodiment approach 3

[0044] The difference from the first embodiment is that the ceramic coating 2, the polymer coating 3 and the ceramic-polymer hybrid coating of this embodiment are all provided with an adhesive, and the adhesive includes polyacrylate, polyacrylonitrile, poly At least one of vinyl alcohol, silicone, epoxy resin, polyurethane, ceramic coating 2, polymer coating 3 and ceramic polymer hybrid coating are all provided with a thickener, the thickener includes methyl cellulose , carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose at least one, the first dyeing agent 21, the second dyeing agent 31 and the third dyeing agent all include chromophoric group and auxiliary Chromophores, including nitro, azo, and vinyl groups, and auxochrome groups are acidic groups and basic groups.

[0045] It should be noted that the thickener includes at least one of methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose, and the relati...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a lithium ion battery diaphragm which comprises a base material and a coating arranged on the surface of the base material. The coating comprises a ceramic coating, a polymer coating or a ceramic and polymer mixed coating; at least one layer of ceramic coating is arranged on one surface of the base material, at least two layers of polymer coatings are respectively arranged on the surface of the ceramic coating and the other surface of the base material, or the ceramic polymer mixed coating is arranged on at least one surface of the base material, the ceramic coating is provided with a first coloring agent, the polymer coating is provided with a second coloring agent, and the ceramic polymer mixed coating is provided with a third coloring agent. The problem of coating missing of the lithium ion battery diaphragm can be solved, the consistency of the coating can be monitored, and the detection efficiency can be improved. In addition, the invention also discloses a preparation method of the lithium ion battery diaphragm.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion battery separator and a preparation method thereof. Background technique [0002] All countries are vigorously developing green and high-efficiency secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. They are widely used in portable appliances, electric tools, large Energy storage, electric transportation power supply and other aspects have broad application prospects. Lithium-ion batteries not only have the characteristics of high working voltage, high energy density, long cycle life, no memory effect and no pollution, but also have the advantages of safety, reliability and fast charging and discharging. They are the main power source of various electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/434H01M50/414H01M50/443H01M50/446H01M50/457H01M50/403H01M10/0525H01M10/42B05D1/38B05D7/00B05D7/24
CPCH01M50/434H01M50/414H01M50/446H01M50/457H01M50/443H01M50/403H01M10/0525H01M10/4235B05D7/24B05D7/544B05D1/38Y02E60/10
Inventor 孙先维赖旭伦晋沛沛符宽李富陈杰杨山郑明清
Owner HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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