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Composite multi-curved-pore membrane material filled by silicon dioxide particles, and preparation method and application therefor

A technology of silica and membrane materials, applied in the field of porous membrane materials and composite multi-porous membrane materials, can solve the problems of high porosity, large surface aperture, micro-short circuit, etc., and achieve the effect of resisting mechanical impact

Active Publication Date: 2016-01-13
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this electrospun nanofiber separator is a non-woven fabric stacked by fibers, it has too high porosity and too large surface pore size, resulting in a low charge retention rate of the battery and frequent micro-short circuits. Especially when the thickness of the battery separator is low, such as below 30 microns, the probability of this situation is quite high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A containing SiO 2 A composite membrane material of micro-nano particles, which uses electrospun polyimide (PI) nanofiber nonwovens as the substrate, and the pores of the substrate are filled with SiO 2 Micronanoparticles (SiO 2 -NP);

[0037] Its preparation method is as follows:

[0038] (1) Nano SiO 2 Water-based suspension (SiO 2 / H 2 O-1) configuration: 80.0 grams of silicon dioxide powder (mainly distributed in diameter of 80 nm), 0.8 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, Emulsified at a speed of 8000 rpm to form a water-based suspension of nano-silicon dioxide (SiO 2 / H 2 O-1).

[0039] (2) SiO 2 Preparation of / PI nanocomposite high-temperature resistant and high-safety battery separator: the above-configured SiO 2 / H 2 The O-1 silica water-based suspension was spread flat on a glass plate to form a suspension film with a thickness of 4...

Embodiment 2

[0042] A containing SiO 2 A composite membrane material of nanoparticles, which uses electrospun polyimide (PI) nanofiber nonwovens as the substrate, and the pores of the substrate are filled with SiO 2 Nanoparticles (SiO 2 -NP);

[0043] Its preparation method is as follows:

[0044] (1) Submicron SiO 2 Water-based suspension (SiO 2 / H 2 O-2) Configuration: 80.0 grams of silicon dioxide powder (mainly distributed in diameter of 500 nm), 0.6 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, Emulsify at a speed of 8000 rpm to form a submicron silica water-based suspension (SiO2) with an absolute viscosity of 20 mPa·S 2 / H 2 O-2).

[0045] (2) SiO 2 Preparation of / PI micro-nano composite high-temperature-resistant high-safety battery separator: the above-configured SiO 2 / H 2 The O-2 silica water-based suspension was spread flat on a glass plate to form a suspensi...

Embodiment 3

[0048] A containing SiO 2 A composite membrane material of nanoparticles, which uses electrospun polyimide (PI) nanofiber nonwovens as the substrate, and the pores of the substrate are filled with SiO 2 Nanoparticles (SiO 2 -NP);

[0049] Its preparation method is as follows:

[0050] (1) Micron SiO 2 Water-based suspension (SiO 2 / H 2 O-3) Configuration: 80.0 grams of silicon dioxide powder (mainly distributed in diameter of 800 nm), 0.5 grams of ammonium polyacrylate, 8.0 grams of butyl acrylate-isooctyl acrylate copolymer, 300.0 grams of distilled water, put them in a beaker at one time, Emulsify at a speed of 10,000 revolutions per minute to form a micron silicon dioxide water-based suspension (SiO 2 / H 2 O-3).

[0051] (2) SiO 2 Preparation of / PI micro-nano composite high-temperature-resistant high-safety battery separator: the above-configured SiO 2 / H 2 The O-3 silica water-based suspension was spread on a glass plate to form a suspension film with a thickne...

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Abstract

The invention discloses a micro-nano composite multi-curved-pore membrane material. The polyimide (PI) nanofiber non-woven fabric is taken as the base material; the pores of the base material are filled by silicon dioxide particles; the diameter of the micro-nano silicon dioxide particles is 50-800 nm, accounting for 20-50% of the total weight of the micro-nano composite multi-curved-pore membrane material; and the PI nanofiber non-woven fabric is 9-38 um in thickness, and 60-80% in the porosity. The micro-nano composite multi-curved-pore membrane material prepared by the invention is high temperature resistant, thermal shrinkage resistant, high voltage resistant, high current impact resistant, and mechanical collision resistant, and suitable for being used as safe battery membranes and safe supercapacitor membranes for manufacturing various high-capacity and high-power lithium ion batteries or supercapacitors. The invention also provides a preparation method for the micro-nano composite multi-curved-pore membrane material, and application of the membrane material in being used as the battery membranes.

Description

technical field [0001] The invention belongs to the field of battery separators and relates to a porous membrane material, in particular to a membrane containing SiO 2 A composite porous membrane material of micro-nano particles, a preparation method thereof, and an application as a battery separator. Background technique [0002] As the power battery of new energy vehicles, lithium-ion batteries have been developed rapidly and will become an indispensable daily necessities for human beings. However, since the currently used lithium battery separator is a polyolefin porous membrane material with poor temperature resistance, at a higher temperature, or in the case of overcharging, overdischarging and mechanical damage, lithium-ion batteries are prone to smoke, Fire, even explosion and other hidden dangers that endanger the safety of users. Therefore, improving the safety of lithium-ion batteries is the key to promoting the application of lithium-ion batteries in automotive ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/423H01M50/431H01M50/443H01M50/491
CPCH01M50/411H01M50/44H01M50/431H01M50/403Y02E60/10
Inventor 侯豪情王琦周小平程楚云何云云
Owner JIANGXI XIAN CAI NANOFIBERS TECH
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