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Carbon material modified porous polymer electrolyte membrane and preparation method thereof

A porous polymer, electrolyte membrane technology, applied in circuits, electrical components, battery pack parts and other directions, can solve the problems of low ionic conductivity, poor electrochemical stability, small lithium ion migration number, etc. Conducive to absorption, improving ionic conductivity and lithium ion migration number

Inactive Publication Date: 2012-07-18
DAQING BRANCH OF HEILONGJIANG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems of low ion conductivity, small lithium ion migration number and poor electrochemical stability in existing porous polymer electrolyte membranes, and provides a carbon material modified porous polymer electrolyte membrane and a preparation method thereof

Method used

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  • Carbon material modified porous polymer electrolyte membrane and preparation method thereof
  • Carbon material modified porous polymer electrolyte membrane and preparation method thereof
  • Carbon material modified porous polymer electrolyte membrane and preparation method thereof

Examples

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specific Embodiment approach 1

[0012] Embodiment 1: A carbon material-modified porous polymer electrolyte membrane in this embodiment is prepared by immersing the porous polymer membrane in the electrolyte solution of a lithium-ion battery for 1 to 4 hours.

[0013] The porous polymer membrane described in this embodiment is prepared from PVDF-HFP, solvent, plasticizer and modified carbon material, wherein the mass ratio of PVDF-HFP to solvent is 1: (6-20), The mass ratio of the plasticizer to the solvent is 1: (5-40), and the mass ratio of the modified carbon material to PVDF-HFP is 1: (10-100).

[0014] Modified carbon materials are added to the porous polymer membrane of this embodiment, which hinders the regular arrangement of polymer chains and reduces the crystallinity of the polymer electrolyte, thereby improving the ion conductivity and lithium ion migration number of the electrolyte membrane, improving and stabilizing the polymerization. Pore ​​structure and electrical properties of electrolyte mem...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the solvent is selected from acetone, butanone, acetonitrile, tetrahydrofuran, 1-methyl-2-pyrrolidone, N,N-dimethylformaldehyde Amides, Benzene, Toluene, Methanol and Ethanol. Others are the same as the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the plasticizer is selected from dibutyl phthalate, propylene carbonate, ethylene carbonate and dimethyl carbonate. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a carbon material modified porous polymer electrolyte membrane and a preparation method thereof, and relates to the polymer electrolyte membrane and the preparation method thereof. The invention aims at solving the problems of low ionic conductivity, small lithium ion transference number and poor electrochemical stability of the conventional porous polymer electrolyte membrane. The carbon material modified porous polymer electrolyte membrane is prepared by soaking the porous polymer membrane in an electrolyte of a lithium ion battery for 1h-4h; and the porous polymer membrane is prepared from PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene), a solvent, a plasticizer and a modified carbon material. The method comprises the following steps of: (1) preparing theporous polymer membrane; and (2) performing soaking treatment to get the carbon material modified porous polymer electrolyte membrane. The carbon material modified porous polymer electrolyte membranehas the advantages that the ionic conductivity achieves 10-3S / cm order of magnitude, the lithium ion transference number is 0.80-0.95, and an electrochemical stability window is 5.5V-6.0V. The preparation method disclosed by the invention is mainly used for preparing the carbon material modified porous polymer electrolyte membrane.

Description

technical field [0001] The invention relates to a polymer electrolyte membrane and a preparation method thereof. Background technique [0002] With the gradual depletion of major resources such as coal and oil, the energy crisis has become a major issue that human beings must solve. Therefore, green and pollution-free new high-energy chemical power sources have become a hot spot that countries around the world are competing to develop. Although liquid lithium-ion batteries have high charge and discharge rates and good low-temperature performance, with the rapid development of product specifications and complex shapes, as well as the urgent needs of high energy and safety and pollution-free, people based on liquid lithium batteries Developed a polymer lithium-ion battery. [0003] Polymer lithium-ion batteries refer to lithium-ion batteries that use solid polymer electrolytes. It has the advantages of high voltage, large specific capacity, good cycle performance, long stor...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08L27/16C08K13/02C08K3/04C08K13/04C08K7/00C08K7/24C08K13/06C08K9/02C08J9/28H01M2/16
CPCY02E60/12Y02E60/10
Inventor 阚侃崔宝玉张广鑫田媛尤秋实刘喆
Owner DAQING BRANCH OF HEILONGJIANG ACAD OF SCI
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