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Isolating membrane as well as preparation method and application thereof

A technology of separator and base film, used in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of increasing the risk of battery deformation, reducing the hardness of lithium-ion batteries, and reducing the adhesion between the separator and the pole piece. , to reduce the risk of deformation, ensure hardness, and increase the effect of gap

Pending Publication Date: 2021-11-26
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two types of methods are likely to lead to a decrease in the bonding force between the separator and the pole piece, thereby reducing the hardness of the lithium-ion battery and increasing the risk of battery deformation

Method used

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  • Isolating membrane as well as preparation method and application thereof
  • Isolating membrane as well as preparation method and application thereof
  • Isolating membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0043] The second aspect of the present invention provides the preparation method of the separator, comprising the following steps:

[0044] S1. Dissolving the first binder 21 to form a particle-free first glue solution;

[0045] S2. Add the polymer particles 22 into the first glue solution and stir to obtain the first slurry;

[0046] S3. Coating the first slurry on at least one surface of the base film 1 and drying to obtain a separation film.

[0047] Wherein, the solvent for dissolving the first binder 21 may be one or more of ethanol, isopropanol, DMAC, tripropylene glycol, and NMP. After drying in step S3, the solvent will volatilize accordingly.

[0048] Further, in step S3, the coating method of the first slurry is: firstly apply the first slurry on at least one surface of the base film 1 by using the dimple coating method, and then put it into the solidified washing in a bath, and drying to obtain a separator. Using this coating method, the first binder 21 with a ...

Embodiment 1

[0054] like figure 1 As shown, a separation film includes a base film 1, an adhesive layer 2 and a heat-resistant layer 3; the adhesive layer 2 is coated on at least one surface of the base film 1, and the heat-resistant layer 3 is coated on the base Between the film 1 and the adhesive layer 2.

[0055] Wherein, the thickness of the base film 1 is 3-200 μm; the porosity of the base film 1 is 20-80%; the air permeability of the base film 1 is 50-200s / 100cc; the base film 1 can be selected from ethylene Microporous diaphragm, polypropylene microporous diaphragm, polypropylene / polyethylene / polypropylene three-layer composite microporous diaphragm, polyvinylidene fluoride microporous diaphragm, polyvinylidene fluoride-hexafluoropropylene microporous membrane, polyimide microporous Any one of porous film, polyethylene non-woven fabric, polypropylene non-woven fabric, polyester non-woven fabric, polyimide non-woven fabric, aramid non-woven fabric, and spandex non-woven fabric.

[...

Embodiment 2

[0064] The difference from Example 1 is the design of the isolation membrane.

[0065] like figure 1 As shown, a release film includes a base film 1 and an adhesive layer 2; the adhesive layer 2 is coated on at least one surface of the base film 1, and the adhesive layer 2 includes a first adhesive 21 and polymer particles twenty two. Wherein, the mass ratio of the first binder 21 to the polymer particles 22 is 0.6.

[0066] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides an isolating membrane as well as a preparation method and application thereof. The isolating membrane comprises a base membrane and a bonding layer, wherein at least one surface of the base film is coated with the bonding layer, and the bonding layer comprises a first bonding agent and polymer particles; and D50 of the polymer particles is greater than the thickness of the bonding layer, and a compression ratio of the polymer particles is 20-90%. Compared with the prior art, the isolating membrane provided by the invention has the advantages that the polymer particles are added into the bonding layer, the D50 of the polymer particles is greater than the thickness of the bonding layer, and the compression ratio of the polymer particles is 20-90%, so that the problem that the bonding layer of the existing isolating membrane is easy to form a membrane after electrolyte swelling and hot pressing in a formation process is effectively solved, and the rate capability and the cycle life of a lithium ion battery are improved and prolonged while the adhesive force of the adhesive is ensured.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a separator and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products and electric vehicles because of their high energy density, good rate performance, and environmental protection. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes, aluminum-plastic films, etc. The separator plays an important role in conducting ions, isolating positive and negative electrodes, and preventing short circuits in lithium-ion batteries. [0003] As end customers have higher and higher requirements for the charging rate of lithium ions, the high dynamic performance of the separator is also required. At present, the bonding coating on the surface of the separator is easy to form a film and block pores on the surface of the separator after the electrolyte is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/443H01M50/411H01M50/449H01M50/403H01M4/62H01M10/0525
CPCH01M50/443H01M50/411H01M50/449H01M50/403H01M4/621H01M10/0525Y02E60/10
Inventor 饶显孟马斌陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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