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PEEK (polyether-ether-ketone) porous separator for lithium ion battery as well as preparation and application of PEEK porous separator

A technology of lithium-ion batteries and porous diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as low heat resistance and poor wettability, and achieve good high temperature stability, fast response, and operability strong effect

Active Publication Date: 2018-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The purpose of the present invention is to provide a method for preparing a porous diaphragm and its application in lithium-ion batteries in view of the problems of low heat resistance and poor wettability of the commercial polyolefin microporous diaphragms of lithium-ion batteries at present.

Method used

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  • PEEK (polyether-ether-ketone) porous separator for lithium ion battery as well as preparation and application of PEEK porous separator
  • PEEK (polyether-ether-ketone) porous separator for lithium ion battery as well as preparation and application of PEEK porous separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add polyether ether ketone, methanesulfonic acid and sulfuric acid to the flask, wherein the mass ratio of methanesulfonic acid and sulfuric acid is 1:0.1, and fully stirred at 20 ° C for 8 hours to make PEEK with a mass concentration of 10%. casting liquid;

[0028] (2) pouring the uniform casting liquid prepared in step (1) on a flat plate and scraping it to make a wet film; then immersing the whole film in methanol solvent for 10 min to form a porous film, soaking in deionized water to remove residual solvent to obtain PEEK porous membrane;

[0029] (3) The PEEK porous membrane is taken out from the deionized water and dried.

[0030] The porosity test of the produced PEEK porous membrane (28um) was about 76%; the contact angle test, the result was 30°. The resulting film was tested for thermal stability, and the result was that only slight deformation occurred at 350°C.

[0031] Lithium-ion battery testing using the prepared porous membrane. The negative ele...

Embodiment 2

[0033] (1) Add polyether ether ketone, methanesulfonic acid and sulfuric acid to the flask, wherein the mass ratio of methanesulfonic acid and sulfuric acid is 1:0.1, and fully stirred at 20 ° C for 18 h to make PEEK mass concentration of 12% uniform casting liquid;

[0034] (2) pouring the uniform casting liquid prepared in step (1) on a flat plate and scraping to make a wet film; then immersing the whole film in water for 15 minutes to form a porous film, soaking in deionized water to remove residual solvent to obtain PEEK porous film diaphragm;

[0035] (3) The PEEK porous membrane is taken out from the deionized water and dried.

[0036] The porosity test of the produced PEEK porous membrane (30um) was about 75%; the contact angle test, the result was 29°. The resulting film was tested for thermal stability, and the result was that only slight deformation occurred at 350°C. Then, under the same conditions as in Example 1, the prepared porous film was used to assemble a ...

Embodiment 3

[0038] (1) Add polyether ether ketone, methanesulfonic acid and sulfuric acid to the flask, wherein the mass ratio of methanesulfonic acid and sulfuric acid is 1:4, and fully stirred at 25 ° C for 12 h to make PEEK with a mass concentration of 15%. casting liquid;

[0039] (2) pouring the uniform casting liquid prepared in step (1) on a flat plate and scraping it into a wet film; then immersing the whole in an ethanol solvent for 25 min to form a porous film, soaking in deionized water to remove residual solvent to obtain PEEK porous membrane;

[0040] (3) The PEEK porous membrane is taken out from the deionized water and dried.

[0041] The porosity test of the prepared PEEK porous membrane (38um) was about 74%; the contact angle test, the result was 31°. The resulting film was tested for thermal stability, and the result was that only slight deformation occurred at 350°C. Then, under the same conditions as in Example 1, the prepared porous film was used to assemble a lith...

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Abstract

The invention discloses a preparation method of a lithium-ion battery separator with good mechanical performance and high-temperature stability and an application of the lithium-ion battery separatorin a lithium-ion battery. A porous separator is prepared from heat-resisting macromolecule resin PEEK (polyether-ether-ketone) as a raw material and a sulfuric acid and methane sulfonic acid mixed solution as a solvent with a phase inversion method. The prepared porous separator is high in heat-resisting class, high in porosity and good in affinity with an electrolyte and facilitates improvement of rate capability of the battery, and safety performance of the battery is improved; compared with a traditional high-temperature melt-blowing film formation method, the phase inversion method for preparing the PEEK porous separator is simple in process, low in cost and high in operability, and further popularization and application are facilitated. The prepared PEEK porous ionic conduction film has the characteristics of good wettability, high heat-resisting class and the like and is one separator material with great application prospect.

Description

technical field [0001] The present invention relates to a lithium ion battery diaphragm, a preparation method and application thereof, and more particularly to a porous polyether ether ketone lithium ion battery diaphragm, a preparation method and application thereof. Background technique [0002] In order to alleviate the problem of environmental pollution, the development of electric vehicles is very important. The use of electric vehicles can alleviate the greenhouse gases and toxic and harmful substances emitted by burning fossil fuels and build a more harmonious living environment. The development of electric vehicles is conducive to alleviating the problem of environmental pollution and building a harmonious and green living environment. The power components used in electric vehicles are batteries, and most commercial electric vehicle batteries are lithium-ion batteries, which have attracted widespread attention due to their high energy density, high efficiency, and e...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/414H01M50/491
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 李先锋张华民李丹史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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