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A kind of porous inorganic film used as lithium ion battery separator and preparation method thereof

A lithium-ion battery, inorganic membrane technology, applied in battery pack parts, circuits, electrical components, etc., to achieve good high and low temperature performance, improve the applicable temperature, and shorten the cycle.

Inactive Publication Date: 2011-12-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, purely inorganic separators may be used to design three-dimensional batteries

Method used

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  • A kind of porous inorganic film used as lithium ion battery separator and preparation method thereof
  • A kind of porous inorganic film used as lithium ion battery separator and preparation method thereof
  • A kind of porous inorganic film used as lithium ion battery separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 0.3g of nano-scale alumina, 0.3g of micron-scale alumina and 0.4g of ethylenediaminetetraacetic acid, mix and grind to obtain a mixture powder, weigh 0.25g of the above-mentioned mixture powder into a mold, and place it under a pressure of 16MPa After pressing into a diaphragm, the obtained diaphragm was sintered in a muffle furnace at 1000°C for 5 hours, cooled to room temperature naturally, and then sintered in a muffle furnace at 1600°C for 5 hours, cooled naturally to room temperature, and immersed in deionized water at 35kHz. Perform ultrasonic cleaning at 100 W for 3 minutes, take it out and then immerse in ethanol, perform ultrasonic cleaning for 3 minutes, and dry in a vacuum oven at 80° C. for 8 hours to obtain the porous inorganic membrane of the present invention.

[0029] Such as figure 1 As shown, under the scanning electron microscope, the porosity of the porous inorganic film of the present invention is greater than 70%.

[0030] The porous inorganic mem...

Embodiment 2

[0035] Weigh 0.3g nanometer calcium oxide, 0.3g micrometer calcium oxide and 0.4g ammonium bicarbonate, mix and grind to obtain a mixture powder, weigh 0.25g of the above mixture powder into a mold, and press it under a pressure of 2MPa Diaphragm, the obtained diaphragm is sintered in a muffle furnace at 300°C for 10 hours, cooled to room temperature naturally, and then sintered in a muffle furnace at 300°C for 10 hours, naturally cooled to room temperature, and immersed in deionized water at 40kHz, 100W Carry out ultrasonic cleaning for 1 min, take it out and then immerse in ethanol, carry out ultrasonic cleaning for 1 min, and dry in a vacuum oven at 80° C. for 6 h to obtain the porous inorganic membrane of the present invention.

Embodiment 3

[0037] Weigh 0.5g of micron-grade alumina and 0.5g of ethylenediaminetetraacetic acid, mix and grind to obtain a mixture powder, weigh 0.25g of the above-mentioned mixture powder into a mold, and press it into a diaphragm under a pressure of 16MPa. The diaphragm was sintered in a muffle furnace at 1000°C for 5 hours, cooled to room temperature naturally, and then sintered in a muffle furnace at 1600°C for 5 hours, cooled to room temperature naturally, immersed in deionized water at 45kHz, 100W for ultrasonic cleaning for 3 minutes, After being taken out, it is immersed in ethanol, ultrasonic cleaning is performed for 3 minutes, and dried in a vacuum oven at 80° C. for 8 hours to obtain the porous inorganic membrane of the present invention.

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Abstract

The invention discloses a porous inorganic membrane used as a separator of a lithium ion battery and a preparation method thereof. The composition of the porous inorganic membrane of the present invention is alumina, silica or magnesia. The preparation method of the porous inorganic membrane of the present invention includes the following steps: mixing and grinding the insulating inorganic material and the pore-forming agent, pressing the membrane under a pressure of 2-20 MPa, and repeating the calcining of the pressed membrane twice at 300-1600°C, and then successively A porous inorganic membrane with stable structure and high porosity was obtained after ultrasonic cleaning in deionized water and ethanol. The porous inorganic membrane of the present invention is used as a lithium-ion battery diaphragm material, and has significant thermal stability and thermal safety advantages, and the battery using the porous inorganic membrane of the present invention shows better cycle performance, rate performance and high and low temperature performance. The porous inorganic membrane prepared by the invention can improve the thermal safety and electrochemical performance of the lithium ion battery, and has stable performance and low cost.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to key materials and technologies of lithium-ion secondary batteries, in particular to a porous inorganic membrane used as a separator of lithium-ion batteries and a preparation method thereof. Background technique [0002] With the depletion of fossil fuels, the research on energy storage and conversion devices has attracted more and more attention. Lithium-ion batteries have become the most attractive secondary batteries due to their high energy density, long cycle life, and low self-discharge rate. However, the large-scale equipment required for power batteries and long-term energy storage requires lithium-ion batteries to have high rate performance, long-term stability, and high-temperature performance. These are problems that need to be solved urgently in the development of lithium-ion batteries. Existing commercial lithium-ion batteries widely use polyolefins and polymer m...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 王海辉陈静娟项宏发
Owner SOUTH CHINA UNIV OF TECH
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