Method for preparing superfine alumina powder

A technology of ultra-fine alumina and alumina, applied in the field of alumina, can solve the problems of demanding alumina powder dispersibility, and achieve the effect of excellent dispersion properties

Active Publication Date: 2018-01-02
浙江爱科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology has higher requirements on the alumina powder itself, for example, there are strict requirements on the particle size, specific surface area, bulk density, etc. of the alumina powder, and the dispersion of the alumina powder on the diaphragm coating. Sexually demanding

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  • Method for preparing superfine alumina powder
  • Method for preparing superfine alumina powder
  • Method for preparing superfine alumina powder

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preparation example Construction

[0023] The raw material used in the preparation method of the present invention, that is, the initial alumina slurry, may be commercially available conventional alumina powder. In industry, the calcining method is usually used to prepare a large amount of alumina powder. However, such an alumina powder preparation process is difficult to prepare alumina powder with excellent performance. Especially in the face of increasingly stringent battery performance requirements, higher and higher requirements are put forward for the particle size distribution and dispersibility of alumina powder. However, the present invention can remarkably improve the particle size distribution, dispersibility and other properties of the alumina powder only by adjusting the grinding steps and related parameters. Advantageously, the alumina powder used as the raw material has an average particle diameter of less than 10 μm. The particles in common alumina powders are usually normally distributed. Th...

Embodiment 1

[0048] Add 4kg of zirconium beads with a diameter of 5.3mm to the rough mill, then add 800-1000g of deionized water, then weigh 1kg of the above-mentioned high-purity α-alumina with a purity of 99.99%, add it, start stirring, and add the high-purity [5g] sodium hexaphosphate with 0.5% of the mass of α-alumina is used for surface modification, and after ball milling at a speed of 30r / min for 3 hours, the stirring is stopped, the slurry is passed through a 100-mesh filter, and then transferred to a fine grinder. Medium zirconium beads have a diameter of 1 mm and a mass of 1 kg. Continue ball milling at a speed of 2000 r / min. Add metasodium hexaphosphate with a mass of 0.5% [5 g] of high-purity α-alumina in portions every half an hour, ball mill for 2 hours, and grind the resulting slurry The raw materials were dried and crushed to obtain alumina powder.

[0049] Weigh 40g of the obtained powder in a colorimetric tube, add 60g of deionized water, shake well for 5min, let stand fo...

Embodiment 2

[0052] Add 4kg of zirconium beads with a diameter of 5.3mm to the rough mill, then add 800-1000g of deionized water, then weigh 1kg of the above-mentioned high-purity α-alumina with a purity of 99.99%, add it, start stirring, and add the high-purity α-alumina mass 0.5% [5g] polyacrylic acid for surface modification, after ball milling at 30r / min for 3 hours, stop stirring, pass the slurry through a 100-mesh filter, and transfer it to a fine grinder, and zirconium in the fine grinder Bead diameter 1mm, mass 1kg, continue ball milling at a speed of 2000r / min, add polyacrylic acid accounting for 0.5% [5g] of high-purity α-alumina in portions every half hour, ball mill for 2 hours, dry the obtained slurry, Pulverize to obtain alumina powder.

[0053] Weigh 40g of the obtained powder in a colorimetric tube, add 60g of deionized water, shake well for 5min, let stand for 48h, and observe the sedimentation situation.

[0054] The obtained powder data: D10 is 0.324μm, D50 is 1.023μm, ...

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Abstract

The invention provides a method for preparing superfine alumina. The method comprises the following steps: (1) performing coarse grinding on alumina slurry in presence of a first dispersing agent; (2)filtering the alumina slurry subjected to coarse grinding; (3) performing fine grinding on the filtered alumina slurry in presence of a second dispersing agent; and (4) drying and grinding the alumina slurry subjected to fine grinding, wherein the first dispersing agent is ammonium polyacrylate, and the second dispersing agent is a mixture of polyacrylic acid and ammonium polyacrylate. The invention further provides superfine alumina powder prepared by the preparation method, and a lithium ion battery diaphragm coating or an electrode coating containing the high-purity superfine alumina powder.

Description

technical field [0001] The invention generally relates to the field of alumina, in particular to a method for preparing ultrafine alumina powder. The ultrafine alumina powder not only has a small particle size, but also has a narrow particle size dispersion, is easy to disperse, and has high purity. Background technique [0002] With the global emphasis on energy and environmental protection, electric vehicles and energy storage systems are highly valued, and the superiority of lithium-ion batteries has become the first choice for electric vehicle power systems. However, there are still many problems in the use of lithium batteries, and the most worrying thing is safety. [0003] In order to effectively improve the safety of lithium batteries, alumina can be coated on the separator coating. However, this technology has higher requirements on the alumina powder itself, for example, there are strict requirements on the particle size, specific surface area, bulk density, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 连加松
Owner 浙江爱科新材料有限公司
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