Composite membrane with polymer coating and preparation method of composite membrane

A technology of polymer coating and composite diaphragm, which is applied in the direction of electrical components, circuits, battery pack parts, etc., can solve the problems of polymer coating quality difference, pollute the environment, affect production quality, etc., and achieve the effect of improving production quality

Active Publication Date: 2016-05-11
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in the process of preparing polymer-coated composite diaphragms, the slurry used is usually an organic solvent. The organic solvent volatilizes seriously, pollutes the environment, and costs high, which makes the production site highly toxic and seriously affects the safety of the production workshop staff. Healthy body
In the patent application No. 201310289143.4, the applicant once proposed to replace the organic solvent slurry with water-based slurry. However, after in-depth research, it was found that since the polymer particles are insoluble in water, when water is used as the solvent, polymer particles are prone to appear. Particle dispersion is uneven, affecting production quality
During processing, even if the polymer particles are uniformly dispersed at the initial use, during use, due to the instability of the aqueous slurry, the polymer particles will float or settle again over time, making the same Batches of products have large differences in the quality of their polymer coatings, especially in large-scale mass production, this problem is particularly serious

Method used

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  • Composite membrane with polymer coating and preparation method of composite membrane
  • Composite membrane with polymer coating and preparation method of composite membrane
  • Composite membrane with polymer coating and preparation method of composite membrane

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preparation example Construction

[0028] In the preparation method of the present application, the water-based slurry is used to replace the organic solvent slurry, which avoids the use of organic solvents, is not only safe and environmentally friendly, but also reduces production costs; more importantly, the application adds a suspension to the water-based slurry agent, so that the water-based slurry is not only uniformly dispersed, but also more stable. In mass production, it effectively solves the problem of instability of the water-based slurry over time, and also solves the problem of water-based slurry due to the dispersion of the water-based slurry. Production quality issues caused by uniformity and stability.

[0029] It can be understood that the key of the present application is to add a suspending agent in the water-based slurry. As for other components of the water-based slurry, you can refer to the existing water-based slurry preparation method, as long as the water-based slurry of the suspending a...

Embodiment 1

[0032] The water-based slurry in this example is formed by dispersing polymer particles, surfactants, water-based binders and suspending agents in deionized water, wherein the polymer particles are polymethyl methacrylate particles (abbreviated as PMMA), and the surface activity Fluorocarbon surfactant is used as agent, styrene-butadiene rubber is used as water-based binder, and sodium chloride is used as suspending agent. The preparation of aqueous slurry as figure 1 As shown, the specific preparation method of the composite diaphragm is as follows:

[0033] (a) Surfactant and deionized water are added in the stirring tank according to the weight ratio of fluorocarbon surfactant: deionized water=0.015%: 100%, and stirred for 20 minutes to obtain mixed solution I;

[0034] (b) PMMA polymer particles were added to the mixed solution I, stirred for 40 minutes to obtain the mixed solution II, wherein the mass ratio of PMMA to deionized water was 20%:100%;

[0035] (c) Add suspe...

Embodiment 2

[0042]The water-based slurry in this example is formed by dispersing polymer particles, surfactants, water-based binders and suspending agents in deionized water, wherein the polymer particles are polymethyl methacrylate particles (abbreviated as PMMA), and the surface activity Fluorocarbon surfactant is used as agent, styrene-butadiene rubber is used as water-based binder, and ethylene dibromide is used as suspending agent. The specific preparation method of the composite diaphragm is as follows:

[0043] (a) Surfactant and deionized water are added in the stirring tank according to the weight ratio of fluorocarbon surfactant: deionized water=0.015%: 100%, and stirred for 20 minutes to obtain mixed solution I;

[0044] (b) PMMA polymer particles were added to the mixed solution I, stirred for 40 minutes to obtain the mixed solution II, wherein the mass ratio of PMMA to deionized water was 20%:100%;

[0045] (c) Add suspending agent to mixed solution II, stir for 30 minutes t...

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Abstract

The invention discloses a composite membrane with a polymer coating and a preparation method of the composite membrane. According to the preparation method, water-based slurry coats one or two surfaces of a base membrane to form the polymer coating; with deionized water as a solvent, polymer particles, a surfactant and an aqueous adhesive are dispersed into the deionized water to form the water-based slurry; the water-based slurry also contains a suspending agent; the amount of the suspending agent is 3%-25% of total weight of the water-based slurry; and the suspending agent is at least one of potassium chloride, sodium chloride, dichloroacetic acid, ethylene dibromide, 3-bromopyridine, 4,5-dichloro 1,3-dioxolame-2-ketone, dichloroethane, dichloroethylene and 1,3-butanediol sulfite. According to the preparation method, the suspending agent is added to the water-based slurry; the solvent density is improved; and the polymer particles can be evenly dispersed into the deionized water to form the stable water-based slurry, so that the production quality of the composite membrane with the polymer coating is improved; and a basis is laid for preparation of a high-quality lithium-ion battery.

Description

technical field [0001] The application relates to the field of battery separators, in particular to a composite separator with a polymer coating and a preparation method thereof. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have been widely used due to their unique performance advantages. Compared with other rechargeable batteries, lithium-ion batteries have high energy density, high operating voltage, long cycle life, and low self-discharge. and other advantages, and are favored by various industries, and are gradually moving from the application of mobile phones and notebook computers to electric bicycles, electric vehicles, etc., so higher requirements are put forward for the safety of lithium batteries. Gel polymer lithium-ion batteries have unique advantages in terms of shape plasticity, and also improve safety problems such as liquid leakage that may exist in liquid lithium-ion batteries. [0003] At present, in the process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/40H01M50/403H01M50/417
CPCH01M50/403H01M50/411Y02E60/10
Inventor 李恒曹志锋瞿威张辉
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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