Preparation method of high-purity boehmite for lithium battery diaphragm

A lithium battery separator, pure boehmite technology, applied in battery pack parts, chemical instruments and methods, alumina/hydroxide preparation, etc., can solve the problems of high cost, complex process, poor purity, etc. Electrochemical performance and safety performance, high chemical purity, and the effect of promoting stability

Pending Publication Date: 2022-05-27
山东诚祥新能源股份有限公司
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Problems solved by technology

The pyrolysis method has the characteristics of serious pollution, uneven powder distribution, and poor purity; the aluminum isopropoxide hydrolysis method belongs to the liquid phase method, and the boehmite prepared has high purity, uniform particle size and good shape. The advantages of regularity, but the preparation process has the characteristics of complex process and high cost

Method used

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  • Preparation method of high-purity boehmite for lithium battery diaphragm
  • Preparation method of high-purity boehmite for lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The activated high-purity aluminum powder and water are stirred and mixed at a mass ratio of 5:100 at room temperature to obtain a high-purity aluminum hydroxide slurry, and the high-purity aluminum hydroxide slurry is concentrated to a solid content of 15%;

[0031] (2) The particle size is D50=10μm, Na 2 O content is 0.02%, Fe 2 O 3 content of 0.01%, CaO content of 0.01%, SiO 2 The content of 0.008% pseudo-boehmite is added to the high-purity aluminum hydroxide slurry obtained after concentration during stirring, and the mass of pseudo-boehmite and high-purity aluminum powder is 0.5:100.

[0032] (3) nitric acid was added dropwise to the slurry containing pseudoboehmite and aluminum hydroxide during stirring, and the pH of the slurry was adjusted to 8.0;

[0033] (4) Transfer the above slurry to a high temperature and high pressure reaction kettle, the reaction temperature is 180°C, and the holding time is 3h;

[0034] (5) After the reaction, the boehmite prec...

Embodiment 2

[0038] (1) The activated high-purity aluminum powder and water are stirred and mixed at a mass ratio of 10:100 at room temperature to obtain a high-purity aluminum hydroxide slurry, and the high-purity aluminum hydroxide slurry is concentrated to a solid content of 15%;

[0039] (2) The particle size is D50=10μm, Na 2 O content is 0.02%, Fe 2 O 3 The content is 0.01%, the content of CaO is 0.01%, and the content of SiO2 is 0.008%. The pseudo-boehmite is added to the high-purity aluminum hydroxide slurry after concentration during the stirring process, and the quality of the pseudo-boehmite and the high-purity aluminum powder is 1.0: 100.

[0040] (3) acetic acid was added dropwise to the slurry containing pseudoboehmite and aluminum hydroxide during stirring, and the pH of the slurry was adjusted to 11.0;

[0041] (4) Transfer the above slurry to a high temperature and high pressure reaction kettle, the reaction temperature is 190°C, and the holding time is 7h;

[0042] (5...

Embodiment 3

[0046] (1) The activated high-purity aluminum powder and water are stirred and mixed at a mass ratio of 10:100 at room temperature to obtain a high-purity aluminum hydroxide slurry, and the high-purity aluminum hydroxide slurry is concentrated to a solid content of 15%;

[0047] (2) The particle size is D50=10μm, Na 2 O content is 0.02%, Fe 2 O 3 content of 0.01%, CaO content of 0.01%, SiO 2 The content of 0.008% pseudo-boehmite is added to the high-purity aluminum hydroxide slurry obtained after concentration during stirring, and the mass of pseudo-boehmite and high-purity aluminum powder is 0.5:100.

[0048] (3) nitric acid was added dropwise to the slurry containing pseudoboehmite and aluminum hydroxide during stirring, and the pH of the slurry was adjusted to 10.0;

[0049] (4) Transfer the above slurry to a high temperature and high pressure reaction kettle, the reaction temperature is 210°C, and the holding time is 3h;

[0050] (5) After the reaction, the boehmite pr...

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Abstract

The invention discloses a preparation method of high-purity boehmite for a lithium battery diaphragm. Activated high-purity aluminum powder is used as a raw material, pseudo-boehmite is used as a seed crystal, acid is used as a hydrotropy dispersant, high-purity water is used as a reaction medium, and a boehmite precursor solution is prepared through a hydrothermal reaction. And grinding the precursor solution by using a grinding pump, washing with water, concentrating, and spray-drying to obtain the high-purity boehmite powder. According to the invention, high-purity boehmite powder prepared from high-purity aluminum powder through a hydrothermal method is mainly in a short rod shape under a microscopic electron microscope; the specific surface area is 1.5-3.5 m < 2 >/g; the particle size D50 is 0.9-1.5 microns, and the particle size distribution is relatively narrow; the chemical purity is high, and Al2O3 is greater than or equal to 99.99%; the content of Na2O is less than or equal to 100 ppm, and the content of other impurities is less than or equal to 70 The preparation method can meet the requirements on electrochemical performance and safety performance of the lithium battery diaphragm material.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials, and particularly relates to a preparation method of boehmite for lithium battery separators. The prepared alumina can be applied to coating the surface materials of lithium battery separators. Background technique [0002] Commercial lithium-ion batteries mainly use polyolefin separator materials with microporous structure, such as single-layer or multi-layer films of polyethylene and polypropylene. Due to the restriction of the melting point of the material, the film breaking temperature of the above-mentioned separator is relatively low, and when the battery is not used properly, the separator is easily contracted or even melted, resulting in a short circuit of the battery. [0003] With the continuous improvement of the capacity of lithium-ion rechargeable batteries, the internal energy storage is getting larger and larger, and the internal temperature during use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/42C01F7/021H01M50/403H01M50/431
CPCC01F7/02C01F7/42C01F7/021H01M50/403B82Y40/00H01M50/431C01P2006/12C01P2004/61C01P2006/80C01P2006/14Y02E60/10
Inventor 马杰马子建刘宽杨宁宁
Owner 山东诚祥新能源股份有限公司
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