Easily dispersed aluminum oxide for ceramic membrane of lithium battery and preparation method thereof

A ceramic diaphragm, alumina technology, applied in battery pack parts, circuits, electrical components, etc., to achieve the effects of low magnetic substances, narrow particle size distribution, and good dispersion performance

Inactive Publication Date: 2019-03-26
建德华明高纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, domestic alumina powder has a certain gap in this respect.

Method used

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  • Easily dispersed aluminum oxide for ceramic membrane of lithium battery and preparation method thereof
  • Easily dispersed aluminum oxide for ceramic membrane of lithium battery and preparation method thereof
  • Easily dispersed aluminum oxide for ceramic membrane of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] S1. Beating and grinding: under stirring conditions, the content of 1000kg is 99.5%, and the specific surface area is 4.5m 2 / g of α-alumina was added to 1000kg of water for mixing and beating. The mixed slurry is purified by a magnetic separator made of magnetic materials that are excited and magnetized (the magnetic field strength of the pipeline filter iron remover is not less than 12000GS), and the content of magnetic substances in the slurry is calculated by mass, accounting for the total solid content in the slurry. 0.5ppm;

[0043] S2. Grinding and sieving: Grinding the slurry after beating and removing iron in step S1 to alumina particle size D through high-energy ball milling 50 The particle size is 1.1 μm, and D 10 0.55μm, D 90 2.69 μm, D 99 is 6.61 μm. After being screened by a vibrating sieving machine equipped with a 500-mesh screen, it is ready for use;

[0044] S3. Dehydration and drying: dehydrate the slurry ground and sieved in step S2 through pla...

Embodiment 2

[0052] S1. Beating and grinding: under stirring conditions, the content of 1000kg is 99.1%, and the specific surface area is 6.4m 2 / g of α-alumina was added to 2300kg of water for mixing and beating. The mixed slurry is purified by a magnetic separator made of magnetic materials that are excited and magnetized (the magnetic field strength of the pipeline filter iron remover is not less than 12000GS), and the content of magnetic substances in the slurry is calculated by mass, accounting for the total solid content in the slurry. 0.9ppm;

[0053] S2. Grinding and sieving: Grinding the slurry after beating and removing iron in step S1 to alumina particle size D through high-energy ball milling 50 The particle size is 1.0μm, and D 10 0.55μm, D 90 2.59 μm, D 99 is 5.7 μm. After being screened by a vibrating sieving machine equipped with a 500-mesh screen, it is ready for use;

[0054] S3. Dehydration and drying: the slurry ground and screened in step S2 is dehydrated by plat...

Embodiment 3

[0060] S1. Beating and grinding: under stirring conditions, the content of 1000kg is 99.8%, and the specific surface area is 5.7m 2 / g of α-alumina was added to 1500kg of water for mixing and beating. The mixed slurry is purified by a magnetic separator made of magnetic material with excitation and magnetization (the magnetic field strength of the pipeline filter iron remover is not less than 12000GS), and the content of the magnetic substance in the slurry is calculated by mass, accounting for the total solid content in the slurry. 0.1ppm;

[0061] S2. Grinding and sieving: Grinding the slurry after beating and removing iron in step S1 to alumina particle size D through high-energy ball milling 50 The particle size is 0.82μm, and D 10 0.35μm, D 90 2.32 μm, D 99 5.1 μm. After passing through a vibrating sieving machine equipped with a 550-mesh sieve, it is used for standby;

[0062] S3, dehydration and drying: the slurry ground and screened in step S2 is dehydrated by pl...

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Abstract

The invention specifically relates to easily dispersed aluminum oxide for a ceramic membrane of a lithium battery and a preparation method thereof. The easily dispersed aluminum oxide for the ceramicmembrane of the lithium battery is prepared from 99.4-99.7% by mass of aluminum oxide and 0.3-0.6% by mass of a dispersant. Al2O3 in the aluminum oxide accounts for 99.0-99.9%, the particle size distribution is D50: 0.8-1.2 [mu]m, and D10 is greater than or equal to 0.3 [mu]m, D90 is smaller than or equal to 3 [mu]m and D99 is smaller than or equal to 8 [mu]m. Magnetic substances in aluminum oxideaccount for a proportion by weight being smaller than 1 ppm. The invention also provides a preparation method of the easily dispersed aluminum oxide. The preparation method is simple, low in purity of a raw material alpha-aluminum oxide, and has a certain cost advantage. The prepared aluminum oxide has the characteristics of low content of magnetic substances, moderate particle size, narrow particle size distribution range, moderate specific surface area and the like. Modified by a dispersant, the easily dispersed aluminum oxide has a good dispersing property in a using process, so that slurry of the ceramic membrane before coating is prepared and coated more favorably.

Description

technical field [0001] The invention specifically relates to an easily dispersible alumina for a lithium battery ceramic diaphragm and a preparation method thereof. Background technique [0002] Due to the emergence of energy consumption and environmental pollution in recent years, large-capacity lithium-ion batteries have been widely used as the main power source in pure batteries and hybrid vehicles, and will be used in satellites, aerospace and energy storage. [0003] According to the "Technology Roadmap for Energy Conservation and New Energy Vehicles" issued by the Society of Automotive Engineers of China, pure electric and plug-in hybrid vehicles, the number of new energy vehicles in 2030 will exceed 80 million, and the sales volume of new energy vehicles in that year is equal to the total sales of vehicles. 40% to 50% of the amount. With the increase in sales of new energy vehicles, vehicle batteries as a core component have also grown rapidly. [0004] Lithium batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/632C04B35/634H01M2/16H01M50/431
CPCC04B35/10C04B35/62218C04B35/632C04B35/63404C04B35/63488H01M50/431Y02E60/10
Inventor 赵月昌高玮田志刚杨筱琼陈曦朱清文
Owner 建德华明高纳新材料有限公司
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