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Polymer electrolyte with semi-interpenetrating network structure and preparation method thereof

A network structure, polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as unfavorable comprehensive performance of polymer electrolytes, complex copolymerization reaction process, and impact on polymer electrolyte performance.

Pending Publication Date: 2022-04-15
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the operation of copolymerization and blending is simple, but it is not conducive to improving the comprehensive performance of the polymer electrolyte; the copolymerization reaction process is relatively complicated, it is difficult to control the degree of reaction, and it is easy to cause excessive polymerization and affect the performance of the polymer electrolyte.

Method used

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  • Polymer electrolyte with semi-interpenetrating network structure and preparation method thereof
  • Polymer electrolyte with semi-interpenetrating network structure and preparation method thereof
  • Polymer electrolyte with semi-interpenetrating network structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The mass ratio of 1: 5 is mixed with PVDF-HFP in 14 ml N, N-dimethylformamide solvent, and the temperature is controlled at 60 ° C, magnetic force for 12 h, and obtains a uniform and stable solution.

[0034] (2) Preparation of linear polymer electrolyte skeleton by solution casting method. The above solution was coated on a clean polytetrafluoroethylene groove or glass sheet to give the solution naturally. The polytetrafluoroethylene groove or glass plate was transferred to a vacuum oven in a vacuum oven in a vacuum oven. After film formation, a diameter of 19 mm was spared, and the film had a film of about 80 μm.

[0035] (3) The mass ratio of acrylonitrile and methacryl glyceride is sufficiently mixed, and the initiator AIBN of the monomer mass of 3% continues to be stirred and mixed into the precursor solution.

[0036] (4) The PVDF-HFP polymer wafer is fully immersed in the precursor solution, so that the precursor solution is sufficiently infiltrated into the surf...

Embodiment 2

[0038] (1) Mix the Litfsi of the molar ratio Li: EO = 1: 16 in 20 ml of acetonitrile solvent, and the temperature was controlled at 50 ° C, and the magnetic force was stirred for 12 h, and a uniform and stable solution was obtained.

[0039] (2) Preparation of linear polymer electrolyte skeleton by solution casting method. The above solution was coated on a clean polytetrafluoroethylene groove or glass sheet to give the solution naturally. The polytetrafluoroethylene groove or glass plate was transferred to a vacuum oven in a vacuum oven in a vacuum oven. After film formation, a diameter of 19 mm was spared, and the film had a thickness of about 140 μm.

[0040] (3) The mass ratio of acrylate and a vinyl carbonate of 3: 7 is thoroughly mixed, and a monomer mass 2% photoinitiator is subjected to a precursor solution.

[0041](4) The PEO polymer wafer is fully immersed in the precursor solution, so that the precursor solution is sufficiently infiltrated into the surface and inside o...

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Abstract

According to the polymer electrolyte with the semi-interpenetrating network structure and the preparation method of the polymer electrolyte, a continuous linear polymer matrix serves as a framework structure, and mechanical support is provided for the polymer electrolyte; the surface and the interior of the linear polymer matrix are filled with another polymer with a network structure, so that a semi-interpenetrating structure is formed. According to the polymer electrolyte provided by the invention, the mechanical property and the lithium stability of the polymer can be improved, and meanwhile, the cycle performance and the thermal stability of the battery are improved.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, and more particularly to a polymer electrolyte having a semi-interpenetrating network structure and a preparation method thereof. Background technique [0002] As one of the most important energy storage devices, the lithium-ion battery has the advantages of high energy density, high output power, high voltage, low operating temperature range, no memory effect, and environmentally friendly, have been widely used in electric vehicles. Rail transit, large-scale energy storage and aerospace and other important areas. At present, commercially charged lithium-ion batteries use organic electrolyte fluids, which are prone to side reactions during charge and discharge, resulting in irreversible attenuation of battery capacity; at the same time battery in long-term service, the organic electrolyte fluid will appear volatile dry , Combustion explosion and other phenomena affect battery life and caus...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08J7/16C08J5/18C08L27/16C08L71/02C08L33/12C08L33/20C08K5/098C08K3/32C08K3/38C08K5/43C08K3/24H01M10/0565H01M10/0525
Inventor 宋大卫王苏马月
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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