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Aluminum oxide solid diaphragm, preparing method of aluminum oxide solid diaphragm, electrochemical battery or capacitor

A kind of aluminum oxide powder and aluminum oxide technology, applied in the field of electrochemistry, can solve the problems of difficulty in meeting the safety performance and high rate performance requirements of power batteries, poor electrolyte wettability, poor high rate performance, etc., and achieve high current Charge-discharge performance, improved safety, effects of suitable pore size

Inactive Publication Date: 2014-08-06
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of separator not only has poor wettability to the electrolyte, but also has low heat resistance temperature and poor high-rate performance.
It is difficult to meet the requirements of power batteries for safety performance and high rate performance

Method used

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  • Aluminum oxide solid diaphragm, preparing method of aluminum oxide solid diaphragm, electrochemical battery or capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing an alumina solid diaphragm, comprising the following steps:

[0038] (1) Mix alumina powder with an average particle size of 0.1 μm and a purity of 99.99% with pore-forming agent ethylenediaminetetraacetic acid (EDTA) at a mass ratio of 4:6, and ball mill for 6 hours to form a mixed powder;

[0039] (2) Pass the obtained mixed powder through a 1000-mesh nylon sieve to obtain dispersed mixed powder;

[0040] (3) Dry press the obtained dispersed mixed powder under a pressure of 10 MPa to obtain a green body;

[0041] (4) Put the obtained biscuit in the sintering furnace. The sintering furnace is in the air flow of 0.5L / min. First, the temperature is raised to 800°C at a rate of 1°C / min. Raise the temperature to 1300°C, keep the temperature for 2 hours, and then cool to obtain a solid aluminum oxide diaphragm with a thickness of 0.1 mm.

[0042] The alumina solid diaphragm prepared in this example was tested for porosity, pore size and air permeabi...

Embodiment 2

[0044] A method for preparing an alumina solid diaphragm, comprising the following steps:

[0045] (1) Mix alumina powder with an average particle size of 0.5 μm and a purity of 99.99% with pore-forming agent ethylenediaminetetraacetic acid (EDTA) at a mass ratio of 1:1, and ball mill for 12 hours to form a mixed powder;

[0046] (2) Pass the obtained mixed powder through a 2000-mesh nylon sieve to obtain dispersed mixed powder;

[0047] (3) Cold isostatic pressing of the obtained dispersed mixed powder under a pressure of 100 MPa to obtain a green body;

[0048] (4) Put the obtained biscuit in a sintering furnace, and the sintering furnace is in an oxygen flow of 2L / min, and the temperature is raised to 900°C at a rate of 3°C / min, and after holding for 4 hours, continue to heat up at a rate of 10°C / min Heat to 1500°C, keep warm for 3 hours, and then cool to obtain a solid aluminum oxide diaphragm with a thickness of 0.2mm.

[0049] The alumina solid diaphragm prepared in th...

Embodiment 3

[0051] A method for preparing an alumina solid diaphragm, comprising the following steps:

[0052](1) Mix alumina powder with an average particle size of 0.8 μm and a purity of 99.999% with pore-forming agent ethylenediaminetetraacetic acid (EDTA) at a mass ratio of 7:3, and ball mill for 24 hours to form a mixed powder;

[0053] (2) Pass the obtained mixed powder through a 3000-mesh nylon sieve to obtain dispersed mixed powder;

[0054] (3) Dry press the obtained dispersed mixed powder under a pressure of 20 MPa to obtain a green body;

[0055] (4) Place the obtained biscuit in a sintering furnace, and the sintering furnace is in an oxygen flow of 4L / min, and the temperature is raised to 1000°C at a rate of 7°C / min, and after holding for 8 hours, continue to heat up at a rate of 15°C / min To 1700°C, keep warm for 5 hours, and then cool to obtain a solid aluminum oxide diaphragm with a thickness of 0.4mm.

[0056] The alumina solid diaphragm prepared in this example was teste...

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Abstract

The invention provides an aluminum oxide solid diaphragm and a preparing method of the aluminum oxide solid diaphragm. The preparing method comprises the following steps that aluminum oxide powder with the average particle diameter being 0.1 to 1mum is mixed with pore forming agents according to a mass ratio being 4:6 to 8:2, ball milling is carried out, and mixed powder is formed; the mixed powder is sieved by a sieve being 1000 to 5000 meshes, and dispersed mixed powder is obtained; then, dry pressing forming or isostatic pressing forming is carried out, and biscuits are obtained; the biscuits are placed in an air or oxygen atmosphere sintering furnace, the temperature is raised to 800 to 1000 DEG C at the speed being 1 to 10 DEG C / minute, after heat insulation is carried out for 1 to 12 hours, the temperature is continuously raised to 1300 to 1800 DEG C at the speed being 5 to 20 DEG C / minute, heat insulation is carried out for 2 to 6 hours, cooling is carried out, and the aluminum oxide solid diaphragm is obtained. The aluminum oxide solid diaphragm has the advantages that the pore diameter is proper, the heat resistance performance is good, and the safety is high, so the safety of an electrochemical battery or a capacitor is effectively improved. The invention also provides an electrochemical battery or a capacitor using the aluminum oxide solid diaphragm.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an alumina solid diaphragm and a preparation method thereof. The invention also relates to an electrochemical cell or capacitor. Background technique [0002] With the development of human productivity, more and more cars are driving in the streets and alleys of cities and villages. The popularity of automobiles has brought great convenience to people's lives. However, the accompanying problems are becoming more and more serious. The consumption of non-renewable energy such as petroleum continues to accelerate, and the impact of vehicle exhaust emissions on the environment continues to expand. At present, in order to solve these problems, people propose to develop electric vehicles in order to replace traditional vehicles. The key lies in whether there is a power battery with sufficient energy density, power density, long enough cycle life, and safe and reliable power battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622H01M2/16H01G9/02H01M50/403H01M50/431
CPCY02E60/13
Inventor 周明杰吴凤
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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