Polymer film having micropore structure, preparation and application thereof

A polymer film and microporous structure technology, applied in the field of electrochemistry, can solve the problems of complex process, hidden safety hazards, and numerous parameters of the phase inversion method, and achieve good ionic conductivity and mechanical properties, stable product quality, and operability strong effect

Active Publication Date: 2011-06-29
DKJ NEW ENERGY S & T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solution casting method needs to use a large amount of volatile solvents, which is costly and has potential safety hazards, while the phase inversion method is complex in process, has many parameters, requires strict control of preparation conditions, and is expensive.

Method used

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  • Polymer film having micropore structure, preparation and application thereof
  • Polymer film having micropore structure, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1 gram of sodium bicarbonate and 1.25 grams of sodium citrate (nucleating agent) and grind and mix them uniformly with a mortar, then add 0.54 grams of citric acid, grind and mix them uniformly with a mortar to obtain a composite foaming agent. Get 0.05 grams of composite blowing agent and join 4.5 grams of 1-methyl 2-pyrrolidone solution of polyvinylidene fluoride-hexafluoropropylene copolymer with a concentration of 10%. After stirring for 4 hours, the polymer solution is coated on the glass On chip, evaporate solvent. The obtained solid polymer film was put into a microwave reactor at 120° C. for 3 minutes to foam to obtain a polymer film with a microporous structure.

[0023] The scanning electron micrographs of the polymer film with the above-mentioned microporous structure are shown in the attached figure 1 , the obvious microporous structure can be seen from this figure.

Embodiment 2

[0025] Get 1 gram of sodium bicarbonate and 0.54 gram of oxalic acid, grind and mix them uniformly with a mortar to obtain a composite blowing agent. Get 0.10 gram of composite foaming agent and join 4 grams of 10% polyvinylidene fluoride in N, N'-dimethylformamide solution, stir for 1 hour, apply the polymer solution on the glass sheet, and volatilize solvent. The obtained solid polymer film was put into a microwave reactor at 150° C. for 1 minute to foam to obtain a polymer film with a microporous structure.

Embodiment 3

[0027] Get 1 gram of sodium bicarbonate and 1.25 gram of formic acid, grind and mix evenly with a mortar to obtain a composite blowing agent. Get 0.10 gram of composite blowing agent and join 8 grams of concentration and be 10% polyacrylonitrile in the N, N'-dimethylformamide solution, after stirring for 2 hours, the polymer solution is coated on the glass sheet, and the solvent is evaporated . Put the obtained solid polymer film into a microwave reactor at 100° C. for 20 minutes to foam to obtain a polymer film with a microporous structure.

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Abstract

The invention belongs to the electrochemical technical field, which is particularly a polymer electrolyte with porous structure, and the preparation method and application of the polymer electrolyte. First of all, the vesicant which has carbonate and organic acid as the main components is prepared and dispersed into polymer solution; the solvent is volatilized to get polymer film, and then the film is foamed under microwave conditions so as to obtain organic and inorganic polymer composites with porous structures. The polymer composite can be used as polymer electrolyte materials for lithium-ion secondary batteries and has very good ion conductivity and mechanical properties. Moreover, the invention has strong operability and stable quality of products.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a microporous polymer electrolyte as well as a preparation method and application. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They have good economic benefits, social benefits, and strategic significance. They have become the most eye-catching green chemical power sources. But there are unsafe factors such as electrolyte leakage. At present, the solution is to use polymer electrolytes instead of liquid electrolytes (see: Wu Yuping, Dai Xiaobing, Ma Junqi, Cheng Yujiang, "Lithium Ion Batteries - Application and Practice", Beijing: Chemical Industry Press, 2004, p. 301). The ionic conductivity of general pure solid polymer electrolytes is often not up to the application requirements. Therefore, many researchers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J9/04C08L71/02C08L33/20C08L33/12C08L27/16C08K5/09H01M10/40C08K3/22H01M10/0565
CPCY02E60/122
Inventor 张鹏张汉平李广超吴宇平
Owner DKJ NEW ENERGY S & T CO LTD
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