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Diaphragm, preparation method thereof and secondary battery

A diaphragm and ceramic slurry technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of high electrostatic force of the diaphragm, difficult NMP treatment, and limited effect improvement, so as to improve wettability and heat resistance Performance, effect of solving swelling problem

Pending Publication Date: 2022-05-20
HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the polyacrylate binder has problems such as low glass transition temperature and poor water resistance, which limit the improvement of the heat resistance of the diaphragm and the improvement of production efficiency; in the polyacrylate system described in the patent number: CN 106953050 Adding an initiator to improve the heat resistance of the separator, but the system is still polyacrylate with low heat resistance and high electrolyte swelling, its effect is limited and many additives are not conducive to production operations
However, the unfavorable factors of PVDF, such as high raw material prices, difficult NMP treatment, and large electrostatic force of the diaphragm, have increased the cost of production and environmental treatment, and at the same time, the large electrostatic force affects the yield rate of subsequent processes.

Method used

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  • Diaphragm, preparation method thereof and secondary battery
  • Diaphragm, preparation method thereof and secondary battery
  • Diaphragm, preparation method thereof and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a lithium-ion battery diaphragm, first preparing a ceramic slurry, denoted as A, and then configuring an initiator and an active dilute monomer solution, denoted as B, wherein: ceramic slurry configuration: according to the ratio of aluminum oxide / Dispersant / wetting agent / modified urethane acrylate / crosslinking agent = 9:0.4:0.1:0.4:0.1 configuration, disperse at 1000r / min for 8min, then defoam at 500r / min for 20min to obtain ceramic slurry a. Initiator and modified urethane acrylate solution configuration, initiator TPO and initiator 184 are mixed at a ratio of 3:1 by weight, and 110 parts of modified urethane acrylate are added for mixing. The total quality of the initiator used is modified urethane acrylate 3% by mass, mixed and stirred until TPO and 184 were completely dissolved to obtain mixed solution B of initiator and reactive diluent monomer. Mix the initiator and active diluted monomer mixture B with the ceramic slurry A at a weight ra...

Embodiment 2

[0049] The difference from Example 1 is that the weight-number ratio of the initiator and the remaining active diluent monomer in the step S2 is 3:110.

[0050] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0052] The difference from Example 1 is that the ratio of parts by weight between the initiator and the remaining reactive diluent monomer in the step S2 is 3:120.

[0053] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a diaphragm and a preparation method thereof and a secondary battery, and the preparation method of the diaphragm comprises the following steps: S1, mixing and dispersing a ceramic material, a dispersing agent, a wetting agent, a part of active diluting monomer and a cross-linking agent to obtain ceramic slurry; s2, mixing and dissolving an initiator and the residual active diluted monomer to obtain a mixed solution; s3, mixing the ceramic slurry with the mixed solution to obtain composite slurry; and S4, coating at least one surface of a base membrane with the composite slurry to obtain the diaphragm. The composite slurry contains the initiator, the active diluent monomer and the ceramic material, the active diluent monomer can be cured and crosslinked with the ceramic material to form a heat-resistant skeleton, the formed cured material cannot swell with an electrolyte, and the swelling problem of a polyacrylate binder used by a traditional diaphragm is solved.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a diaphragm, a preparation method thereof and a secondary battery. Background technique [0002] Polyolefin separators are currently the most widely used lithium battery separators. However, the existing polyolefin separators on the market have problems with electrophilic electrolyte performance, insufficient heat resistance, and adhesion. In order to improve the electrolyte wettability and heat resistance of the polyolefin separator, the current main solution is to coat the ceramic composite polyacrylate and PVDF binder on one or both sides of the polyolefin separator. This coating is Currently the most widely used solution to solve the wettability and heat resistance of the diaphragm electrolyte, in order to solve the problem of battery hardness, by coating PMMA and PVDF particles on the surface of the ceramic coating and the surface of the base film to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M10/0525H01M50/403H01M50/414H01M50/417H01M50/434H01M50/443H01M50/451H01M50/489
CPCH01M50/446H01M50/403H01M50/414H01M50/417H01M50/434H01M50/443H01M50/451H01M50/489H01M10/0525Y02E60/10
Inventor 周家乐赖旭伦孙先维
Owner HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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