Aluminum oxide for coating ceramic diaphragm of lithium battery and preparation method of aluminum oxide

A ceramic diaphragm, alumina technology, applied in alumina/hydroxide preparation, chemical instruments and methods, alumina/aluminum hydroxide and other directions, can solve the problems of high cost, agglomeration, wide powder particle size distribution, etc. Effects of low content of magnetic substances, low content of magnetic substances, and narrow particle size distribution

Inactive Publication Date: 2019-02-15
方复(上海)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The alumina in the prior art is high-purity and ultra-fine, and the purity of alumina is required to be above 99.99%. High-purity alumina has the characteristics of high cost and complicated preparation process.
Both the hydrothermal method and the hydrolysis reaction of aluminum alcohol salt have the characteristics of complex process and high cost
Although high-purity alumina powder has achieved a breakthrough in the control of trace impurity elements in recent years, there are still problems such as relatively poor stability of powder batches, wide particle size distribution and agglomeration of powder.
[0009] In addition, various powder materials, slurries, etc. will inevitably be mixed with magnetic substances of different sizes during the production process, such as rust, iron wire, screws, nuts, etc., and these magnetic substances are fatal to the battery during use. side effects
As an industrial technical issue, current products and technologies do not involve these magnetic substances

Method used

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  • Aluminum oxide for coating ceramic diaphragm of lithium battery and preparation method of aluminum oxide
  • Aluminum oxide for coating ceramic diaphragm of lithium battery and preparation method of aluminum oxide
  • Aluminum oxide for coating ceramic diaphragm of lithium battery and preparation method of aluminum oxide

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Experimental program
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Effect test

Embodiment 1

[0060] (1) Preparation of ammonium aluminum carbonate precursor:

[0061] The preparation of aluminum ammonium sulfate aqueous solution: 4kg aluminum ammonium sulfate is added into 96kg pure water, obtains clear and transparent 100kg aluminum ammonium sulfate aqueous solution, wherein, by mass fraction, the content of aluminum ammonium sulfate is 4%;

[0062] The preparation of ammonium bicarbonate aqueous solution: join 4.44kg ammonium bicarbonate, 1.48kg polyvinyl alcohol into 43.4kg pure water, stir, obtain clear and transparent 49.32kg ammonium bicarbonate aqueous solution, wherein, by mass fraction, ammonium bicarbonate The content of the dispersant is 9%; the content of the dispersant is 3%;

[0063] Under stirring conditions, add ammonium aluminum sulfate dropwise to the ammonium bicarbonate aqueous solution, and control the temperature of the solution at 10-50°C. After the dropwise addition, continue to stir and homogenize for 1 hour, then age for 12 hours, and finally...

Embodiment 2

[0071] (1) Preparation of ammonium aluminum carbonate precursor:

[0072] The preparation of aluminum ammonium sulfate aqueous solution: 10kg aluminum ammonium sulfate is added into 90kg pure water, obtains clear and transparent 100kg aluminum ammonium sulfate aqueous solution, wherein, by mass fraction, the content of aluminum ammonium sulfate is 4%;

[0073] The preparation of ammonium bicarbonate aqueous solution: join 11.1kg ammonium bicarbonate, 5.18kg polypropylene alcohol, into 57.72kg pure water, stir, obtain clear and transparent 74kg ammonium bicarbonate aqueous solution, wherein, by mass fraction, ammonium bicarbonate The content of the dispersant is 15%; the content of the dispersant is 7%;

[0074] Under stirring conditions, add ammonium aluminum sulfate dropwise to the aqueous ammonium bicarbonate solution, and control the temperature of the solution to 50°C. After the dropwise addition, continue to stir and homogenize for 1 hour, then age for 12 hours, and final...

Embodiment 3

[0082] (1) Preparation of ammonium aluminum carbonate precursor:

[0083] The preparation of aluminum ammonium sulfate aqueous solution: 6kg aluminum ammonium sulfate is added into 94kg pure water, obtains clear and transparent 100kg aluminum ammonium sulfate aqueous solution, wherein, by mass fraction, the content of aluminum ammonium sulfate is 4%;

[0084] Preparation of ammonium bicarbonate aqueous solution: add 6.66kg of ammonium bicarbonate, 1.11kg of hexadecylbenzenesulfonic acid, 1.11kg of Span 40, and 1.11kg of polyethylene glycol into 56.61kg of pure water and stir to obtain a clear and transparent 66.6kg ammonium bicarbonate aqueous solution, wherein, by mass fraction, the content of ammonium bicarbonate is 10%; The content of dispersant is 5%;

[0085] Under stirring conditions, add ammonium aluminum sulfate dropwise to the aqueous ammonium bicarbonate solution, and control the temperature of the solution to 30°C. After the dropwise addition, continue to stir and h...

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Abstract

The invention discloses aluminum oxide for coating a ceramic diaphragm of a lithium battery and a preparation method of the aluminum oxide. The content of the aluminum oxide is not lower than 99.9%; the aluminum oxide has the particle size and distribution as follows: the D50 particle size is 0.5-1.2 microns, D10 is larger than or equal to 1 / 2D50, D90 is smaller than or equal to 3D50, and D99 is smaller than or equal to 5D50; the magnetic substance proportion in terms of the total mass of a product is lower than 0.5 ppm; and the aluminum oxide has the specific surface area of 5.5-7.5 m<2> / g. The preparation method of the aluminum oxide comprises the following steps: preparing an ammonium aluminum carbonate precursor, calcinating the ammonium aluminum carbonate precursor to obtain alpha-aluminum oxide, grinding, sieving and demagnetizing the alpha-aluminum oxide, performing dewatering drying, crushing and the like. The aluminum oxide has the characteristics of moderate median diameter and narrow particle size distribution, and a requirement during preparation of the ceramic diaphragm through lithium battery diaphragm coating is met; the aluminum oxide has low magnetic substance content, so that safety of the product during using is guaranteed; and through addition of a dispersing agent in the preparation process, the prepared aluminum oxide has a small primary crystal particle size and high dispersion performance.

Description

technical field [0001] The invention relates to the technical field of new inorganic functional powder materials, in particular to a method for preparing alumina, in particular to a method for preparing alumina for coating lithium battery ceramic diaphragms. 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%-50% of the amount. With the increase in sales of new energy vehi...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01F7/44C01F7/02C01F7/46H01M2/16H01M2/14H01M50/403H01M50/431H01M50/434H01M50/449
CPCC01F7/022C01F7/023C01F7/30C01F7/44C01F7/46C01P2006/12C01P2004/61H01M50/403H01M50/409Y02E60/10
Inventor 赵月昌杨筱琼陈曦高玮胡蝶
Owner 方复(上海)新材料科技有限公司
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