Manufacturing method for ceramic diaphragm with low water absorbency

A technology of ceramic diaphragm and water absorption performance, which is applied in the direction of electrical components, circuits, battery pack components, etc. It can solve the problems of high temperature resistance difference, adsorption of moisture and dust impurities, poor wettability of high temperature resistant electrolyte, etc., and achieve low water absorption performance , Guarantee the effect of electrical performance and safety performance

Inactive Publication Date: 2016-09-21
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The diaphragm has the advantages of low cost and mass production, but it has the disadvantages of poor high temperature resistance and poor electrolyte wettability. Ceramic diaphragm products are introduced accordingly. For example, ZL200410003674.3 ceramics is coated on the surface of the above-mentioned polyethylene or polypropylene diaphragm. Improve the high temperature resistance of the separator and the shortcomings of poor electrolyte wettability
[0004] However, conventional ceramic separators generally use submicron alumina particles with a specific surface area of ​​4-8m2 / g. If the environmental humidity or dust is not properly controlled during separator coating or battery production, it is easy to absorb moisture and dust impurities. Seriously affect the electrical performance and safety performance of lithium batteries

Method used

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  • Manufacturing method for ceramic diaphragm with low water absorbency

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Bake 500g of aluminum oxide submicron powder at 600°C for 6h, add it to 1L of tetrahydrofuran solvent, add 50g of aluminate coupling agent, react at 60°C for 4h, obtain a solid after filtration, and vacuum the solid Heat in an oven at 40°C for 12h. Add 100 g of the above solid to 500 g of deionized water and stir, add 4 g of polyacrylic acid powder, and 0.5 g of CMC powder and stir for 12 hours to obtain an aqueous slurry. The water-based slurry obtained above was sprayed on one side of the 12um PE diaphragm, and baked at 45°C for 3 minutes to obtain a ceramic diaphragm with a total thickness of 16um.

Embodiment 2

[0024] Baked 500g of titanium dioxide submicron powder at 600°C for 6h, added to 1L of cyclohexane solvent, added 50g of titanate coupling agent, reacted at 50°C for 2h, filtered to obtain a solid, and put the solid in a vacuum oven at 40°C Heating for 12h. Add 100 g of the above solid to 500 g of deionized water and stir, add 4 g of PVA powder, and 0.5 g of CMC powder and stir for 12 hours to obtain an aqueous slurry. The water-based slurry obtained above was sprayed on one side of the 12um PE diaphragm, and baked at 45°C for 3 minutes to obtain a ceramic diaphragm with a total thickness of 16um.

Embodiment 3

[0026] Baked 500g of magnesium hydroxide submicron powder at 600°C for 4h, added to 1L of cyclohexane solvent, added 50g of titanate coupling agent, reacted at 50°C for 2h, filtered to obtain a solid, and put the solid in a vacuum oven Heat at 40°C for 12h. 100 g of the above solid was added into 500 g of deionized water and stirred, 4 g of PMMA powder was added, and 0.5 g of CMC powder was stirred for 12 hours to obtain an aqueous slurry. The water-based slurry obtained above was coated on one side of the 12um PE diaphragm with an anilox roller, and baked at 45°C for 3 minutes to obtain a ceramic diaphragm with a total thickness of 16um.

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Abstract

The invention provides a manufacturing method for a ceramic diaphragm with low water absorbency. The manufacturing method comprises the following steps of 1) surface modification of a ceramic powder: enabling the ceramic powder to be mixed into an organic solvent of a coupling agent, reacting for 2-8h at a temperature of 40-80 DEG C to enable the surface of the ceramic powder to be crosslinked with a hydrophobic functional group; and then carrying out vacuum drying to obtain a solid material; 2) preparing the solid material obtained in the step 1) into aqueous paste, wherein the aqueous paste comprises 10-50mass% of the solid material, 1-20mass% of a binder and 50-80mass% of deionized water; and 3) coating the surface of the lithium ion battery diaphragm with the aqueous paste prepared in the step 2), and removing moisture through a baking process to obtain the product. The manufacturing method has the beneficial effects that the water absorbency of the surface of the ceramic diaphragm is lowered; meanwhile, it is ensured that the ceramic diaphragm does not adsorb moisture and impurity in the production, transport and use processes; and therefore, the electrical property and the safety performance of the lithium battery are ensured.

Description

technical field [0001] The invention relates to a preparation technology of a lithium battery diaphragm, in particular to a method for manufacturing a ceramic diaphragm with low water absorption performance. Background technique [0002] Lithium-ion secondary batteries are widely used in power vehicles and digital products, and gradually replace lead-acid and nickel-chromium batteries as the most important chemical batteries. As an important part of the lithium battery, the separator mainly plays the role of isolating the positive and negative electrodes of the lithium battery, preventing electronic conduction, and at the same time ensuring the smooth passage of lithium ions. [0003] Traditional lithium-ion battery separators are mainly prepared from polyethylene or polypropylene resin through wet or dry pore-making processes, such as Toray’s wet-process PE separator, Ube Chemical’s PP dry-process separator, and Celgard’s PP / PE / PP three-layer co-extruded diaphragm. The d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/446
CPCH01M50/403Y02E60/10
Inventor 杨浩田王晓明韦程王志彬
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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