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SiO2-PS nuclear shell structure ceramic coating diaphragm and preparation method and application thereof

A technology of core-shell structure and ceramic coating, which is applied in the direction of structural parts, separators/films/diaphragms/spacer components, electrical components, etc., can solve the problems of increasing the internal resistance of lithium batteries, uneven dispersion of ceramic powder, and thermal shutdown. Problems such as poor porosity, to achieve the effect of solving the negative impact of porosity, good bonding effect, and good mechanical properties

Active Publication Date: 2018-11-02
安徽美芯新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with the application number CN 201410445356.6 discloses a diaphragm, which is composed of a ceramic material layer coated on the surface of the base film and a PVDF polymer adhesive layer coated on the outer surface of the ceramic layer, which improves the resistance of the diaphragm. Thermal performance, but compared with the original film, the gas permeability loss of the coated diaphragm is larger, which hinders the conduction of lithium ions and increases the internal resistance of the lithium battery; the coating process is complicated, resulting in a decrease in product production efficiency, and the increase in thickness and weight is not conducive to Product Lightweight
In addition, there are still many problems to be solved in the actual application of the above-mentioned ceramic composite diaphragm, which mainly focus on the following three points: (1) The ceramic powder falls off and causes the blockage of the diaphragm pores; (2) The dispersion of the ceramic powder is uneven; (3) ) under the high temperature condition of 135-150 ℃, the thermal closing performance is poor

Method used

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  • SiO2-PS nuclear shell structure ceramic coating diaphragm and preparation method and application thereof
  • SiO2-PS nuclear shell structure ceramic coating diaphragm and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Monodisperse nano-SiO 2 Preparation of granules: Mix 15mL concentrated ammonia water, 120mL ethanol solution and 12mL tetraethyl orthosilicate at the same time, react with Stöber method at room temperature, seal the bottle and carry out magnetic stirring for 18-24h, then centrifuge, and sieve the particle size Monodisperse nano-SiO of 50 nm and below 2 Particles are preserved in ethanol solution to form monodisperse nano-SiO 2 The particle dispersion is ready for use;

[0028] (2) Monodisperse nano-SiO 2 Modification of Particles: Using Monodisperse Nano-SiO 2 The ratio of particles to deionized water 0.85mg / mL, the monodisperse nano-SiO 2 Add the particle dispersion to the deionized water in the four-neck flask, mix 0.5mg of γ-methacryloxypropyltrimethoxysilane with 20mL of ethanol, and prepare γ-methacryloxypropyltrimethoxysilane ethanol The solution was added to a four-necked flask and 5-10 drops of ammonia water were added dropwise, and under the protection...

Embodiment 2

[0033] In this example, on the basis of Example 1, in step (4), monodisperse core-shell SiO 2 -PS composite particles are fully washed with toluene, centrifuged at a speed above 8000rpm, and then fully washed with ethanol to monodisperse core-shell SiO 2 -PS composite particles, then centrifuged, and the monodisperse core-shell SiO 2 -PS composite particles, water-based adhesive, and solvent are mixed at a weight ratio of 70-100:1~5:500~1000, and then ultrasonic dispersion and mechanical stirring are carried out for 2-3 hours at the same time, so that each component is fully dispersed and uniform to form a uniform texture The mixed slurry; through the use of toluene washing, ethanol washing two processes, can effectively remove the monodisperse core-shell SiO 2 -Free PS and other impurities on the surface of PS composite particles can effectively reduce core-shell SiO in the subsequent process of making diaphragm coating slurry 2 - Adhesion between PS composite particles, ef...

Embodiment 3

[0035] This example is modified on the basis of Example 2. In the step (1), 20mL of concentrated ammonia water, 100mL of ethanol solution and 15mL of ethyl orthosilicate are mixed simultaneously, and 0.8mgγ - Mix methacryloxypropyltrimethoxysilane with 20mL ethanol to prepare ethanol solution of γ-methacryloxypropyltrimethoxysilane; step (4) uses styrene-butadiene rubber (SBR) and carboxymethyl The compound of cellulose-based cellulose (CMC) is used as a water-based binder, and 50% ethanol is used as a solvent. The compound of styrene-butadiene rubber and carboxymethyl cellulose is mixed in a ratio of 2-3:3. and modulated monodisperse core-shell SiO 2 -The weight ratio of PS composite particles, water-based adhesive, and solvent is 95-100:5-6:800-1000; in step (5), a porous PE film is used instead.

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Abstract

The invention relates to the technical field of the lithium ion battery diaphragm production, and specifically relates to a SiO2-PS nuclear shell structure ceramic diaphragm coating. A preparation method of the SiO2-PS nuclear shell structure ceramic diaphragm coating comprises the following steps: after modifying the monodispersed nanometer SiO2-particle in-situ grafted gamma-methacryloyloxy trimethoxy silane (MPS) prepared through the St-ber method, coating the monodispersed nanometer modified SiO2 particles by adopting the polyvinyl pyrrolidone ethanol solution and styrene-azodiisobutyronitrile mixed solution, thereby forming the nuclear shell structure with stable combination effect, and preparing the SiO2-PS nuclear shell structure ceramic diaphragm coating slurry; the nuclear shell SiO2-PS composite particle with good dispersibility can be uniformly dispersed in the coating slurry system and cannot produce excessive agglutination, and can form the coating not hindering the polyolefin porous diaphragm gap after being coated on the polyolefin porous diaphragm, and has good combining effect with the polyolefin porous diaphragm, and the membrane has good mechanical performance onthe whole; the diaphragm has stable membrane form under high-temperature state, the SiO2 of the nuclear layer is free from ceramic powder falling and blocking diaphragm duct under the coating of theglass-state polymer when the heat shrinkage phenomenon of the diaphragm caused by the high temperature is effectively blocked, and the security of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragm production, in particular to a SiO 2 -PS core-shell structure ceramic diaphragm coating, as well as the preparation method and application of the diaphragm coating. Background technique [0002] Lithium-ion batteries are widely used in the field of portable devices, and are considered to be the most promising power battery system for electric vehicles. However, the working mode of the existing system, especially when used as a power source for electric vehicles, still exists technically. Definitely a safety hazard. In diaphragm lithium-ion batteries, the diaphragm is used to prevent the direct contact of positive and negative electrode materials to avoid short-circuiting the battery. It is called the third pole of lithium-ion batteries and is a key factor restricting the safety of lithium-ion batteries. . At present, most commercialized liquid lithium-ion batteries use mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/0525
CPCH01M10/0525H01M50/40H01M50/409H01M50/463Y02E60/10
Inventor 徐井水黄伟汕张朝益
Owner 安徽美芯新材料有限公司
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