Preparation method of porous alumina ceramic and preparation method of lithium ion battery diaphragm

A porous alumina, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of poor wettability of electrolyte, easy to fall off, etc., achieve good wetting effect, improve safety performance, and high specific surface area.

Pending Publication Date: 2022-04-05
惠州锂威新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the ceramics introduced into the diaphragm coating are all dense powders, which have problems such as poor wettability to the electrolyte and easy falling off.

Method used

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  • Preparation method of porous alumina ceramic and preparation method of lithium ion battery diaphragm
  • Preparation method of porous alumina ceramic and preparation method of lithium ion battery diaphragm
  • Preparation method of porous alumina ceramic and preparation method of lithium ion battery diaphragm

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preparation example Construction

[0030] like figure 1 As shown, this embodiment provides a method for preparing porous alumina ceramics, including the following steps:

[0031] S1. Preparation of porous alumina aggregate ceramic powder:

[0032] S11. Using in-situ decomposition technology to form pores, use aluminum hydroxide fine powder as raw material to heat up to 240-360°C at a heating rate of 1.5-2.5°C / min in a high-temperature furnace, and keep warm for 1-2h;

[0033] S12, then raise the temperature to 850-1050°C at 2.8-4°C / min, and keep warm for 2-4h;

[0034] S13, cooling with the furnace to obtain porous alumina aggregate powder;

[0035] S2. Preparation of porous alumina ceramic powder with nano-pore size:

[0036] S21, according to the mass ratio of porous alumina aggregate ceramic powder: water is 100: (2~6) ingredients, the porous alumina aggregate ceramic powder is placed in the mixer;

[0037] S22. Add water, stir for 10-30 minutes, and wait for 18-24 hours to trap the material;

[0038] S...

Embodiment 1

[0058] The preparation process of the lithium-ion battery separator of the present embodiment is as follows:

[0059] (1) Preparation of porous alumina aggregate ceramic powder

[0060] Using the in-situ decomposing pore-forming technology, aluminum hydroxide fine powder was used as raw material in a high-temperature furnace to raise the temperature to 240°C at a heating rate of 1.5°C / min, hold for 1h, then raise the temperature to 850°C at 2.7°C / min, hold for 2h, and then The furnace is cooled to obtain porous alumina aggregate powder.

[0061] (2) Preparation of porous alumina ceramic powder with nanopore size

[0062] 1. According to the mass ratio of porous alumina aggregate ceramic powder: water as 100:2, put the porous alumina aggregate ceramic powder in the mixer, then add water, stir for 10min, and after 18h of stuffing, the mixture is heated at 100MPa Under extrusion molding, the formed green body is dried at 110°C for 16 hours, then the dried green body is placed i...

Embodiment 2

[0070] The preparation process of the lithium-ion battery separator of the present embodiment is as follows:

[0071] (1) Preparation of porous alumina aggregate ceramic powder

[0072] Using the in-situ decomposition technology, aluminum hydroxide fine powder is used as raw material to heat up to 300°C at a heating rate of 2°C / min in a high-temperature furnace, hold for 1.5h, then raise the temperature to 950°C at 3.4°C / min, and hold for 3h. After cooling in the furnace, the porous alumina aggregate powder is obtained.

[0073] (2) Preparation of porous alumina ceramic powder with nanopore size

[0074] 1. The mass ratio of porous alumina aggregate ceramic powder: water is 100:4, and the porous alumina aggregate ceramic powder is placed in a mixer, then the water is added, stirred for 20 minutes, and the material is trapped for 21 hours. Extruded at 140MPa, the formed green body was dried at 120°C for 18 hours, then the dried green body was placed in a high-temperature furn...

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Abstract

The invention provides a preparation method of porous alumina ceramic and a preparation method of a lithium ion battery diaphragm. The preparation method of the porous alumina ceramic comprises the following steps: heating aluminum hydroxide fine powder to 240-360 DEG C at a heating rate of 1.5-2.5 DEG C / min, preserving heat for 1-2 hours, heating to 850-1050 DEG C at a heating rate of 2.8-4 DEG C / min, preserving heat for 2-4 hours, and cooling to obtain porous alumina aggregate powder; the preparation method comprises the following steps: stirring porous alumina aggregate ceramic powder and water according to a mass ratio of 100: (2-6) for 10-30 min, aging for 18-24 h, carrying out extrusion molding under 100-180 MPa, drying the molded green body at 110-130 DEG C for 16-20 h, heating to 1600-1700 DEG C at a heating rate of 3-5 DEG C / min, and cooling to obtain the porous alumina ceramic with the nano aperture. The nano-aperture porous alumina ceramic prepared by the method has the characteristics of good mechanical property, heat resistance, low density and high specific surface area.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of porous alumina ceramics and a preparation method of lithium ion battery separators. Background technique [0002] Lithium-ion batteries are widely used in 3C consumer, power and energy storage fields due to their characteristics of fast charging, small size and high capacity, long battery life and high safety. Among them, the performance of the separator in the lithium-ion battery determines the battery capacity, safety performance, charge-discharge density and cycle characteristics. Therefore, the preparation of a separator with excellent performance plays an important role in improving the overall performance of lithium-ion batteries. [0003] With the development of existing technologies, higher requirements are put forward for the performance of lithium-ion batteries in all aspects, especially their high-temperature resistanc...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/10C04B35/64H01M10/0525H01M50/403H01M50/434H01M50/449
Inventor 熊伟马斌陈杰杨山
Owner 惠州锂威新能源科技有限公司
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