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Ceramic-gel polymer multilayer composite lithium battery diaphragm and preparation method thereof

A technology of gel polymer and lithium battery diaphragm, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problem that the thermal safety ability is difficult to meet the requirements, and achieve good ability to absorb and maintain electrolyte, The effect of reducing production cost and good cycle life

Inactive Publication Date: 2014-11-19
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now large-scale commercial lithium battery separators are mainly made of polypropylene and polyethylene. As people have higher and higher performance requirements for lithium batteries, it is difficult to meet the thermal safety and electrolyte retention ability of these two separators alone. Research on the preparation of high-performance composite diaphragms of other materials and polyolefins has become the most important direction of diaphragm modification

Method used

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  • Ceramic-gel polymer multilayer composite lithium battery diaphragm and preparation method thereof
  • Ceramic-gel polymer multilayer composite lithium battery diaphragm and preparation method thereof
  • Ceramic-gel polymer multilayer composite lithium battery diaphragm and preparation method thereof

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preparation example Construction

[0029] A kind of ceramic and gel polymer multilayer composite lithium battery diaphragm, reference figure 2 , including a polypropylene support layer 1 , a polyethylene partition layer 2 , a ceramic coating layer 3 and a polymer coating layer 4 stacked in sequence. Its preparation method comprises the following steps:

[0030] Step 1: Configure water-based PVDF slurry and water-based ceramic slurry;

[0031] Step 2: Polypropylene diaphragm and polyethylene diaphragm are compounded, and a layer of polypropylene diaphragm and a layer of polyethylene diaphragm are thermally compounded at 50-100 ° C to obtain a PP / PE composite diaphragm;

[0032] Step 3: Coating, use the PP / PE composite diaphragm obtained in step 2 as the coating substrate, apply the water-based slurry prepared in step 1 on the PE surface of the substrate, and first coat the water-based ceramic slurry to form a ceramic layer Afterwards, the water-based PVDF slurry is coated to form a gel polymer layer at a coat...

Embodiment 1

[0045] Waterborne PVDF slurry preparation

[0046] The weight ratio of PVDF-HFP in the slurry: deionized water=100:500. First, add acrylic adhesive and tackifier CMC into deionized water, and stir at 300r / min for 20min at room temperature until completely dissolved, wherein the weight ratio of acrylic adhesive and CMC is adhesive: PVDF- HFP=5:100, CMC:PVDF-HFP=1:100. Then add fluorocarbon surfactant, dispersant polyvinylpyrrolidone (PVP) and PVDF-HFP powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min, the slurry configuration is completed. Wherein fluorocarbon surfactant:PVDF-HFP=0.1:100, PVP:PVDF-HFP=0.3:100. The weight average molecular weight of PVDF-HFP is about 140,000, and the particle size is 100-300nm.

[0047] 2) Ceramic slurry preparation

[0048] The weight proportion in the slurry is Al2O3: deionized water=100:150.

[0049] First, add PVA adhesive and tackifier CMC into deionized water, stir...

Embodiment 2

[0053] 1) Preparation of water-based PVDF slurry

[0054] The polymer coating layer is coated by water-based slurry, and the weight ratio of PVDF-HFP: deionized water in the water-based slurry is 100:500. First, add the adhesive PVA and tackifier CMC into deionized water, and stir at 300r / min for 20min at room temperature until completely dissolved, wherein the weight ratio of PVA and CMC is PVA:PVDF-HFP=5:100, CMC :PVDF-HFP=1:100. Then add fluorocarbon surfactant, dispersant polyoxyethylene dioleate and PVDF-HFP powder to the above solution in sequence, continue to stir at 300r / min for 10min, and finally stir at 5000r / min for 5min at high speed, the slurry configuration is completed . Among them, fluorocarbon surfactant: PVDF-HFP=0.1:100, polyoxyethylene dioleate: PVDF-HFP=0.3:100. The weight average molecular weight of PVDF-HFP is about 140,000, and the particle size is 100-300nm.

[0055] Others are the same as embodiment 1.

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Abstract

The invention discloses a preparation method of a ceramic-gel polymer multilayer composite lithium battery diaphragm. The preparation method comprises the following steps: 1, preparing aqueous PVDF (polyvinylidene fluoride) slurry and aqueous ceramic slurry; 2, thermally compounding a polypropylene diaphragm and a polyethylene diaphragm at 50-100 DEG C to obtain PP / PE (polypropylene / polyethylene) composite diaphragm; 3, with the PP / PE composite diaphragm obtained in the step 2 as a coating substrate, coating the aqueous slurry prepared in the step 1 onto the PE surface of the substrate: coating the aqueous ceramic slurry to form a ceramic layer first and then coating the aqueous PVDF slurry to form a gel polymer layer, with the coating speed of 5-100m / min, and drying in a drying box with the temperature of 30-100 DEG C to obtain a final four-layer composite diaphragm. The invention further discloses a ceramic-gel polymer multilayer composite lithium battery diaphragm prepared by the preparation method. The prepared ceramic-gel polymer multilayer composite lithium battery diaphragm has the advantages of high thermal safety and high capability of keeping electrolyte.

Description

technical field [0001] The invention relates to a lithium ion battery separator, in particular to a ceramic and gel polymer multilayer composite lithium battery separator with high thermal safety and strong electrolyte retention capacity and a preparation method thereof. Background technique [0002] As one of the four major materials of lithium batteries, the separator is a key inner layer component in lithium batteries, although it does not participate in the electrochemical reactions in the battery. Key properties such as battery capacity, cycle performance, and charge-discharge current density are directly related to the diaphragm, and the improvement of the performance of the diaphragm plays an important role in improving the overall performance of the lithium battery. In a lithium battery, the separator absorbs the electrolyte and isolates the positive and negative electrodes to prevent short circuits, but at the same time allows the conduction of lithium ions. When o...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/443H01M50/489H01M50/491
CPCH01M10/0525H01M50/403H01M50/446H01M50/491H01M50/443H01M50/489Y02E60/10
Inventor 吴术球杨佳富苗发成何方波陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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