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Method for preparing porous composite polymer electrolyte film through gas volatilization

An electrolyte film and porosity technology, which is applied in the field of polymer electrolyte film preparation, can solve the problems of limited popularization, poor mechanical properties of polymer films, and poor processability, so as to improve ionic conductivity and accelerate film curing Speed, the effect of improving ion conductivity

Inactive Publication Date: 2012-12-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its disadvantage is that the prepared polymer film has poor mechanical properties and poor processability, which limits its popularization and use.

Method used

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  • Method for preparing porous composite polymer electrolyte film through gas volatilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An appropriate amount of ammonium bicarbonate solution (W NH4HCO3 =5%), nano-Al 2 o 3 Add to dimethylacetamide (DMAC) and shake evenly, then add polyvinylidene fluoride (PVDF), where NH 4 HCO 3 :Al 2 o 3 : PVDF: DMAC mass ratio is 0.1:0.05:1:6; Stir at 30°C for 2 hours to obtain a uniform gel, stand to remove air bubbles, apply the gel evenly on a glass plate, evaporate the solvent at 80°C to form Membrane, ammonium bicarbonate decomposed into water, ammonia and carbon dioxide pore modified PVDF / Al 2 o 3 polymer electrolyte membrane.

[0025] The resulting PVDF / Al 2 o 3 The polymer electrolyte film was treated with 1mol / L LiPF 6 After soaking and activating the EC-DMC-EMC solution, its ionic conductivity was tested by AC impedance method to be 2.3mS / cm. Cyclic voltammetry tests showed that PVDF / Al 2 o 3 The electrochemical stability window of the electrolyte film is >5.5V, the breaking strength is >15MPa, and the porosity is 57%.

Embodiment 2

[0027] An appropriate amount of ammonium carbonate solution (W (NH4)2CO3 =2.5%), nano-SiO 2 Add to dimethylformamide (DMF) and shake evenly, then add polyvinylidene fluoride (PVDF), where (NH 4 ) 2 CO 3 : SiO 2 : PVDF:DMF ratio is 0.3:0.3:1:4; Stir at 15°C for 2 hours to obtain a uniform gel, stand to remove air bubbles, apply the gel evenly on a glass plate, and evaporate the solvent at 90°C to form a film , to obtain ammonium carbonate decomposed into water, ammonia and carbon dioxide pore-forming PVDF / SiO 2 polymer electrolyte membrane.

[0028] The resulting PVDF / SiO 2 The polymer electrolyte film was treated with 1mol / L LiPF 6 After the EC-DMC-EMC solution was soaked, activated and plasticized, its ion conductivity was tested by AC impedance method to be 2.4mS / cm. Cyclic voltammetry tests showed that PVDF / SiO 2 The electrochemical stability window of the electrolyte film is >5.5V, the breaking strength is >22MPa, and the porosity is 60%.

Embodiment 3

[0030] Appropriate amount of ammonium carbamate solution (W NH2COONH4 =5%), Nano TiO 2 Add to acetone and shake evenly, then add hexafluoropropylene copolymer (PVDF-HFP), in which NH 2 COONH 4 : TiO 2 : PVDF-HFP: Acetone ratio is 0.1:0.1:1:5; Stir at 10°C for 5 hours to obtain a uniform gel, let it stand to remove air bubbles, spread the gel evenly on a glass plate, and place it under vacuum at 90°C Volatile solvent is formed into a film, and ammonium carbamate is decomposed into ammonia and carbon dioxide to form pores and modify PVDF-HFP / TiO 2 polymer electrolyte membrane.

[0031]The resulting PVDF-HFP / TiO 2 The polymer electrolyte film was treated with 1mol / L LiPF 6 After the EC-DMC-EMC solution was soaked, activated and plasticized, the ionic conductivity was tested by AC impedance method to be 2.8mS / cm. Cyclic voltammetry tests showed that PVDF-HFP / TiO 2 The electrochemical stability window of the electrolyte film is >5.5V, the breaking strength is >11MPa, and th...

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Abstract

The invention relates to a composite polymer porous film which contains a polymer, can be subjected to thermal decomposition to obtain a gaseous compound at a low temperature and may contain inorganic adding particles. The method comprises the following steps: a casting film solution which can be subjected to thermal decomposition at a low temperature to form the gaseous compound is added to prepare a wet film, the wet film is dried at 40-90 DEG C in vacuum atmosphere, air atmosphere or other atmospheres, and the gas which can be subjected to thermal decomposition at a low temperature to formthe gaseous compound, in the casting solution is used to form pores and obtain the porous film. After the obtained polymer electrolyte film is soaked in an EC-DMC-EMC lithium salt solution to soak, activate and plasticize, the film has good electrochemical property. The obtained polymer electrolyte film has good mechanical strength and flexibility, high ionic conductivity and good electrochemicalproperty; and industrial production is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing a polymer electrolyte film of a lithium ion battery. Background technique [0002] With the increasingly prominent problems of environmental pollution, energy crisis and resource shortage, countries all over the world are paying more and more attention to the development of high-efficiency, clean, renewable energy and electric vehicles and other related technologies. [0003] In recent years, with the popularity of portable electronic devices and the development of electric vehicles, lithium-ion batteries as a new generation of high-energy power sources have received great attention. The gel polymer electrolyte lithium-ion battery not only has the advantages of high specific capacity, high working voltage, high cycle life, no memory effect, and environmental friendliness, but also is safe, flexible, and easy to process. Since it was put on the market in 1999, Immediately aroused widespread concern. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/08C08J9/06C08J5/18C08L27/16C08L27/20H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 郭华军黄思林李新海王志兴杨波肖围彭文杰胡启阳张云河
Owner CENT SOUTH UNIV
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