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Preparing process of microporous composite polymer battery separator

A technology of composite polymer and battery diaphragm, applied in the direction of battery components, circuits, electrical components, etc., can solve the problems of poor ionic conductivity, unfavorable ionic conductivity, poor lithium compatibility, etc., and achieve high production efficiency and ionic conductivity Good, the effect of improving the service life and performance

Inactive Publication Date: 2012-08-22
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) PVDF (polyvinylidene fluoride): good mechanical strength, but easy to crystallize, which is not conducive to ion conduction;
[0004] (2) PMMA (polymethyl methacrylate): Although it can accommodate a large amount of electrolyte, its mechanical properties are poor;
[0005] (3) PEO (polyethylene oxide): Poor ion conductivity limits its application at room temperature;
[0006] (4) PAN (polyacrylonitrile): poor compatibility with lithium, severe interface passivation

Method used

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  • Preparing process of microporous composite polymer battery separator
  • Preparing process of microporous composite polymer battery separator
  • Preparing process of microporous composite polymer battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1, prepare PMMA:

[0048] In inert gas N 2 Under atmosphere protection, add 1 to 3 parts by weight of emulsifier into 60 to 67 parts by weight of deionized water and stir to dissolve, then add 30 to 37 parts by weight of monomer n-methyl methacrylate, At the same time, the temperature is raised to 55-65°C, and after reacting for 0.5-2 hours, 0.1-0.4 parts by weight of the initiator is added, the initiator is dissolved in other deionized water in advance, and the reaction is stirred for 6-9 hours to obtain Milky white emulsion, said milky white emulsion is poured into the Al that is 2~5 parts by weight 2 (SO 4 ) 3 stirring in an aqueous solution to break the emulsion, and then washing with water to obtain a white polymer, and drying the white polymer under vacuum at 45-60°C to obtain PMMA;

[0049] Step 2, preparation of gel polymer solution:

[0050] (1) Add 6 g of PMMA obtained in step 1 to 1200 g of acetone solvent, heat and stir until boiling and continue b...

Embodiment 2

[0057] Step 1, prepare PMMA:

[0058] In inert gas N 2 Under atmosphere protection, add 1 to 3 parts by weight of emulsifier into 60 to 67 parts by weight of deionized water and stir to dissolve, then add 30 to 37 parts by weight of monomer n-methyl methacrylate, At the same time, the temperature is raised to 55-65°C, and after reacting for 0.5-2 hours, 0.1-0.4 parts by weight of the initiator is added, the initiator is dissolved in other deionized water in advance, and the reaction is stirred for 6-9 hours to obtain Milky white emulsion, said milky white emulsion is poured into the Al that is 2~5 parts by weight 2 (SO 4 ) 3 stirring in an aqueous solution to break the emulsion, and then washing with water to obtain a white polymer, and drying the white polymer under vacuum at 45-60°C to obtain PMMA;

[0059] Step 2, preparation of gel polymer solution:

[0060] (1) Add 6 g of PMMA obtained in step 1 to 1200 g of acetone solvent, heat and stir until boiling and continue b...

Embodiment 3

[0067] Step 1, prepare PMMA:

[0068] In inert gas N 2 Under atmosphere protection, add 1 to 3 parts by weight of emulsifier into 60 to 67 parts by weight of deionized water and stir to dissolve, then add 30 to 37 parts by weight of monomer n-methyl methacrylate, At the same time, the temperature is raised to 55-65°C, and after reacting for 0.5-2 hours, 0.1-0.4 parts by weight of the initiator is added, the initiator is dissolved in other deionized water in advance, and the reaction is stirred for 6-9 hours to obtain Milky white emulsion, said milky white emulsion is poured into the Al that is 2~5 parts by weight 2 (SO 4 ) 3 stirring in an aqueous solution to break the emulsion, and then washing with water to obtain a white polymer, and drying the white polymer under vacuum at 45-60°C to obtain PMMA;

[0069] Step 2, preparation of gel polymer solution:

[0070] (1) Add 6 g of PMMA obtained in step 1 to 1200 g of acetone solvent, heat and stir until boiling and continue b...

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Abstract

The invention provides a preparing process of a microporous composite polymer battery separator. The microporous composite polymer battery separator is prepared by coating gel polymer solution on two sides of a supporting body and drying, wherein the gel polymer solution is formed by blending low-boiling-point organic micromolecular pore forming agent, PMMA (polymethyl methacrylate)-based copolymer, PVDF (polyvinylidene fluoride)-HFP (hexafluoropropylene) and a solvent. The preparing process is simple, high in production efficiency, and compatible with the traditional equipment for preparing the battery, and can realize industrialized and large-batch production; and the prepared microporous composite polymer battery separator has high ionic conductivity and excellent mechanical property, and is particularly suitable for a polymer lithium ion battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a microporous composite polymer battery diaphragm and a preparation process thereof. Background technique [0002] Lithium-ion batteries have become the first choice for applications such as mobile power supplies and energy storage devices due to their high energy density, long cycle life, and environmental friendliness. Lithium-ion battery electrolyte generally uses traditional liquid organic electrolyte, which makes the safety of lithium-ion batteries very serious. Since solid electrolyte (SPE) and gel polymer electrolyte (GPE) no longer contain free electrolyte, it is a good way to solve the problem of lithium ion safety, but the conductivity of solid electrolyte is only 1×10 -5 S cm -1 , which limits its development in lithium-ion batteries, and the conductivity of gel polymer electrolyte (GPE) can be in the range of 1×10 -3 S cm -1 As mentioned above, because the gel polymer ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J7/04B32B27/06B32B27/08B32B27/30B32B27/32H01M2/16
CPCY02E60/10
Inventor 傅昭冯岸柏冯洪亮李伟善
Owner HYB BATTERY
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