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Preparation method, product and application of nano aluminum oxide material

A technology of nano-alumina and alumina, applied in the field of preparation of nano-alumina materials, can solve the problems of low yield of nano-alumina material powder, restricting the application of gas-phase nano-alumina materials, low purity, etc., and achieve large-scale popularization and application. Value, easy mass production, the effect of process science

Active Publication Date: 2015-03-25
东莞市鸿德电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the low yield and low purity of nano-alumina powder prepared by the traditional gas-phase method, this largely restricts the application of gas-phase nano-alumina materials in the lithium-ion battery industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of nano-alumina material, comprising the steps of:

[0021] 1) Preparation of the precursor: Mix the micron-sized alumina powder and carbon powder with a molar ratio of 1:0.5~2 evenly, and press it into a compact after mixing evenly; through a drum mixer or a double-screw mixer (or Other mixing equipment suitable for dry powder mixing) to mix evenly, and after mixing evenly, under the condition of pressing pressure of 200-500MPa, it is pressed into a compact by molding;

[0022] 2) Preparation of Al2O3: place the pressed compact in a vacuum furnace cavity, and pump the vacuum furnace to 10 -1 ~10 -4 Pa, then turn on the heating power of the vacuum furnace, raise the temperature to 1150-1300°C at a heating rate of 20-40°C / min, and keep it warm for 1-10h. At this time, alumina and carbon powder are heated through 2C+Al 2 o 3 =Al 2 The O+2CO reaction begins to generate gaseous alumina;

[0023] 3) The formation of nano-alumina material: the temper...

Embodiment 2

[0027] A preparation method of nano-alumina material, comprising the steps of:

[0028] 1) Preparation of the precursor: Mix micron-sized alumina powder and carbon powder in a molar ratio of 2:1 through a drum mixer or double-screw mixer (or other mixing equipment suitable for dry powder mixing), After mixing evenly, under the condition of pressing pressure 200MPa, it is pressed into compact by molding;

[0029] 2) Preparation of Al2O3: place the pressed compact in a vacuum furnace cavity, and pump the vacuum furnace to 10 -1 The vacuum degree of Pa, then turn on the heating power of the vacuum furnace, raise the temperature to 1150°C at a heating rate of 30°C / min, and keep it for 1h. At this time, the alumina and carbon powder are heated by 2C+Al 2 o 3 =Al 2 The O+2CO reaction begins to generate gaseous alumina;

[0030] 3) The formation of nano-alumina material: the temperature of the vacuum furnace in step 2) is naturally cooled down to room temperature, and then heated...

Embodiment 3

[0032] A preparation method of nano-alumina material, comprising the steps of:

[0033] 1) Preparation of the precursor: Mix micron-sized alumina powder and carbon powder at a molar ratio of 1:2 through a drum mixer or double-screw mixer (or other mixing equipment suitable for dry powder mixing), After mixing evenly, under the condition of pressing pressure 500MPa, press into compact by molding;

[0034] 2) Preparation of Al2O3: place the pressed compact in a vacuum furnace cavity, and pump the vacuum furnace to 10 -4 Then turn on the heating power of the vacuum furnace, raise the temperature to 1300°C at a heating rate of 40°C / min, and keep it warm for 10 hours. At this time, alumina and carbon powder are heated by 2C+Al 2 o 3 =Al 2 The O+2CO reaction begins to generate gaseous alumina;

[0035] 3) The formation of nano-alumina material: the temperature of the vacuum furnace in step 2) is naturally cooled down to room temperature, and then heated at 50 m 3 Air is introdu...

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Abstract

The invention discloses a preparation method of a nano aluminum oxide material. The preparation method is characterized by comprising the following steps: (1) preparing a precursor, namely uniformly mixing micron-scale aluminum oxide powder with carbon powder in a molar ratio of 1:(0.5-2), and then pressing into a briquette; (2) preparing sub-aluminum oxide, namely performing heating and heat preservation on the pressed briquette under a vacuum condition with the pressure of 10<-1>-10<-4> Pa until the aluminum oxide reacts with the carbon powder according to 2C+Al2O3=Al2O+2CO and gaseous sub-aluminum oxide starts to be generated; and (3) forming the nano aluminum oxide material, namely lowering the temperature in the step (2), then introducing air, discharging carbon monoxide at the same time to ensure that the gaseous aluminum oxide under the vacuum condition is converted into the nano aluminum oxide material, and collecting nano powder obtained under the vacuum condition, thereby obtaining the nano aluminum oxide material. The invention also discloses the nano aluminum oxide material prepared by the method, and an application of the nano aluminum oxide material in doping of a positive electrode material of a lithium ion battery.

Description

technical field [0001] The invention relates to alumina preparation technology, in particular to a preparation method, product and application of a nano-alumina material. Background technique [0002] Nano-scale alumina materials have high hardness, high strength, heat resistance, corrosion resistance and other characteristics, and are widely used in machinery, metallurgy, petroleum, chemical industry, electronics, optics, nuclear reaction, aerospace, lithium-ion batteries and other fields. At present, the preparation methods of nano-scale alumina materials can be roughly divided into three categories: liquid phase method, solid phase method, and gas phase method. [0003] Among them, the gas phase method is a preparation method in which solid raw materials are evaporated into steam or gas raw materials are directly used at a relatively high temperature, and after a chemical reaction, they are condensed into solid nanoparticles and collected to obtain nanomaterials. For exa...

Claims

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Application Information

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IPC IPC(8): C01F7/02B82Y30/00B82Y40/00
CPCC01F7/02C01P2004/32C01P2004/64
Inventor 盛洪超李尹庆刘瑞
Owner 东莞市鸿德电池有限公司
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