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Core/shell structure fiber film-based gel polymer electrolyte and preparation method thereof

A gel polymer and shell structure technology, applied in the direction of conjugated synthetic polymer artificial filaments, circuits, electrical components, etc., can solve problems such as hindering commercial applications, loss of electrochemical properties, and decline in mechanical properties, and achieve stability The effect of electrochemical window, good charge and discharge performance, strong adsorption and retention ability

Inactive Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coating / casting method is relatively widely used, and its advantage is that it can guarantee high mechanical properties, but the electrical properties are relatively poor, and the obtained product is not a real "gel"
The polymer electrolyte prepared by the electrospinning technology that has developed rapidly in recent years has a true "gel" property and has great advantages in electrical properties, but the current structural system rich in liquid small molecules leads to Significant decline in mechanical properties, thus hindering commercial application
Adding reinforcing agents, cross-linking and other methods to improve its mechanical properties, but will lose electrochemical properties. To solve this contradiction, it is necessary to develop new technical means

Method used

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  • Core/shell structure fiber film-based gel polymer electrolyte and preparation method thereof
  • Core/shell structure fiber film-based gel polymer electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Component 1 is polyacrylonitrile with a molecular weight of 10 5 g / mol (Mw), the manufacturer is UK Courtaulds Co. Component 2 is polymethyl methacrylate with a molecular weight of 1.0~1.3×10 5 g / mol (Mw), the manufacturer is Aldrich Chemical Co. Component 3 is 1mol / L LiPF 6 / DEC-EC (molar ratio is 1:1) electrolyte, the manufacturer is Beijing Chemical Plant. The solvent used for the core layer and the shell layer spinning solution is N,N-dimethylformamide, wherein the concentration of the core layer spinning solution is 14wt%, and the concentration of the shell layer spinning solution is 20wt%. During the coaxial electrospinning process The flow rate ratio of the core spinning liquid to the shell spinning liquid is 0.5. The polymer fiber membrane obtained by electrospinning was dried in a vacuum oven at 50 °C for 8 h to remove residual moisture and solvent. Then it was cut into discs with a diameter of 22 mm, laminated and compacted, with a total weight of 78 mg,...

Embodiment 2

[0025] Component 1 is polyvinylidene fluoride, molecular weight 5.3×10 5 g / mol (Mw), the manufacturer is Aldrich Chemical Co. Component 2 is polyethylene oxide with a molecular weight of 10 5 g / mol (Mw), the manufacturer is Shanghai Liansheng Chemical Company. Component 3 is 1mol / L LIPF6 / DMC-EC (molar ratio 1:1) electrolyte. The solvent used for the core layer and the shell layer spinning solution is N,N-dimethylformamide, wherein the concentration of the core layer spinning solution is 10wt%, and the concentration of the shell layer spinning solution is 16wt%. During the coaxial electrospinning process The flow rate ratio of the core spinning liquid to the shell spinning liquid is 0.7. The polymer fiber membrane obtained by electrospinning was dried in a vacuum oven at 50 °C for 8 h to remove residual moisture and solvent. Then it was cut into discs with a diameter of 24 mm, laminated and compacted, with a total weight of 85 mg, and vacuum-dried at 60° C. for 20 h to ob...

Embodiment 3

[0028] Component 1 is polyacrylonitrile with a molecular weight of 10 5 g / mol (Mw), the manufacturer is UK Courtaulds Co. Component 2 is polyethylene oxide with a molecular weight of 10 5 g / mol (Mw), the manufacturer is Shanghai Liansheng Chemical Company. Component 3 is 1mol / L LIPF6 / DEC-EC (molar ratio 1:1) electrolyte. The solvent used for the core layer and the shell layer spinning solution is N,N-dimethylformamide, wherein the concentration of the core layer spinning solution is 12wt%, and the concentration of the shell layer spinning solution is 18wt%. During the coaxial electrospinning process The flow rate ratio of the core spinning liquid to the shell spinning liquid is 0.8. The polymer fiber membrane obtained by electrospinning was dried in a vacuum oven at 50 °C for 8 h to remove residual moisture and solvent. Then it was cut into discs with a diameter of 20 mm, laminated and compacted, with a total weight of 70 mg, and vacuum-dried at 60° C. for 20 h to obtain...

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Abstract

The invention relates to a polymer electrolyte, especially relates to a micropore polymer electrolyte skeletal material prepared by a coaxial electrospinning technology and a method for preparing a gel polymer electrolyte from the skeletal material, and belongs to the field of polymer lithium ion batteries. The preparation method comprises the following steps of 1, preparing core and shell layer electrostatic spinning solutions, 2, preparing a core / shell structure nanometer fiber film by a coaxial electrospinning technology, 3, drying and cutting the nanometer fiber film, and carrying out lamination to obtain a polymer gel electrolyte skeleton, and 4, putting the skeleton into an electrolyte in a glove box and carrying out activation and gelation. The electrolyte skeleton has ultra-strong electrolyte adsorptivity and retentivity. The prepared gel polymer electrolyte has high ion conductivity, a stable electrochemical window, good charging and discharging performances and good interface compatibility with a lithium electrode, satisfies common button cell assembling requirements and can be used for preparation of a secondary lithium ion battery.

Description

technical field [0001] The invention mainly relates to a microporous polymer electrolyte framework material prepared by coaxial electrospinning technology and a method for preparing a gel-type polymer electrolyte by using the framework material, belonging to the field of polymer lithium ion batteries. Background technique [0002] The polymer lithium-ion battery uses a polymer electrolyte with ion conductivity and a diaphragm function instead of a liquid electrolyte, and its working principle is basically the same as that of a liquid lithium-ion battery. During the charge and discharge process of the battery, lithium ions are intercalated and deintercalated between the positive and negative electrodes through the ion-conductive polymer electrolyte to realize the transformation from chemical energy to electrical energy. Compared with liquid lithium-ion batteries, polymer lithium-ion batteries have high energy density, do not have the problem of liquid leakage in liquid electr...

Claims

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Application Information

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IPC IPC(8): H01M10/0565D01F8/08D01F8/10D01F8/16
CPCY02E60/10
Inventor 隋刚毕海涛杨小平李刚张珍珍
Owner BEIJING UNIV OF CHEM TECH
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