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Composite diaphragm slurry, preparation method thereof and battery diaphragm

A composite diaphragm and battery diaphragm technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems affecting the liquid absorption rate and retention rate of the diaphragm, unfavorable electrolyte infiltration and absorption, etc., to improve the ratio and Long-term cycle performance, good rate and safety performance, and the effect of uniform current density distribution

Pending Publication Date: 2021-11-05
湖南烁普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the polyaryletherketone diaphragm is hydrophobic, which is not conducive to the infiltration and absorption of the electrolyte, and affects the liquid absorption and retention rate of the diaphragm.

Method used

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  • Composite diaphragm slurry, preparation method thereof and battery diaphragm
  • Composite diaphragm slurry, preparation method thereof and battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Dissolve 0.5 g of polyimide (PI) powder (molecular weight 60,000 to 85,000) in 77 g of dimethylacetamide, heat and stir at 60°C to prepare a polymer solution. Add 0.1g dispersant (BYK-LPN25432), 10g Al 2 o 3 Powder (D50 is 0.6-1.2 μm), stirred evenly to make precursor slurry. The rotational speed of stirring and mixing was 400 rpm / min, and the stirring time was 2 hours.

[0048] The above precursor slurry is passed through a fully enclosed spray dryer, using nitrogen as the inert gas, and the slurry is dried and transported in an oxidation-resistant environment of a closed loop system. The atomization drying temperature is 90 ° C, and the atomization pressure is 0.2 MPa. The feeding rate is 100ml / h, and the polymer-coated ceramic particles are prepared, with a particle size of 0.7-1.6 μm.

[0049] According to the mass ratio, polymer-coated ceramic particles: deionized water: cellulose ether dispersant: sodium carboxymethyl cellulose: acrylate adhesive = 38%: 45%: 0....

Embodiment 2

[0054] Dissolve 0.1 g of polyimide (PI) powder (molecular weight 60,000 to 85,000) in 74.07 g of dimethylacetamide, heat and stir at 60°C to prepare a polymer solution. Add 0.1 g of dispersant (BYK-LPN25432) and 10 g of Al2O3 powder (D50 is 0.6-1.2 μm) to the above polymer solution, and stir evenly to make a precursor slurry. Other preparations are the same as in Example 1.

Embodiment 3

[0056] Dissolve 1 g of polyimide (PI) powder (molecular weight 60,000 to 85,000) in 80.67 g of dimethylacetamide, heat and stir at 60°C to prepare a polymer solution. Add 0.1 g of dispersant (BYK-LPN25432) and 10 g of Al2O3 powder (D50 is 0.6-1.2 μm) to the above polymer solution, and stir evenly to make a precursor slurry. Other preparations are the same as in Example 1.

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Abstract

The invention discloses composite diaphragm slurry and a composite diaphragm, and belongs to the technical field of lithium ion battery diaphragm production. The composite diaphragm comprises the following raw materials of: 10-20 parts of polymer coated ceramic particles, 10-25 parts of deionized water, 0.01-0.1 part of a dispersant, 1-3 parts of a binder and 0.01-1 part of an auxiliary agent. The preparation method of the polymer coated ceramic particles comprises the following steps of: uniformly mixing a polymer, ceramic particles and a dispersing agent; and then preparing the polymer coated ceramic particles in an inert atmosphere through a spray drying method. The polymer is one or two of polyisophthaloyl metaphenylene diamine and polyimide. A lithium ion battery prepared from the composite diaphragm has better multiplying power and safety performance. A coating layer has good wettability and liquid retention for electrolyte, and is beneficial to improving the rate and long cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery materials, in particular to a composite diaphragm slurry and a lithium-ion battery diaphragm. Background technique [0002] Lithium-ion batteries have rapidly occupied the energy storage market in various fields due to their advantages such as high working voltage, high specific energy and specific power, small self-discharge, no memory effect, good cycle stability and environmental protection. With the thinning and thinning of 3C digital products and the application of lithium-ion batteries in electric vehicles, energy storage power stations and other fields, people have put forward higher requirements for their electrochemical performance, especially safety performance. As one of the four key materials of lithium-ion batteries, the separator plays the role of isolating the direct contact between positive and negative electrodes and allowing lithium ions to pass through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/489H01M50/491H01M50/403H01M10/0525
CPCH01M50/446H01M50/449H01M50/489H01M50/491H01M50/403H01M10/0525Y02E60/10
Inventor 齐爱汤云夏海潮张杨张鹏
Owner 湖南烁普新材料有限公司
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