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A porous monoionic conductive polymer electrolyte membrane and a preparation method and application thereof

A technology of electrolyte separator and conductive polymer, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as environmental pollution, high operational safety requirements, and increase of internal short-circuit areas, and achieve wide commercial application and easy preparation. Method, effect of improving ionic conductivity

Active Publication Date: 2019-01-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used polyolefin separator / liquid electrolyte systems suffer from several major disadvantages as follows: (1) The low glass transition temperature and melting point of polyolefin-based separators subject them to severe thermal shrinkage at high temperatures, which may increase internal short circuits area
In addition, organic non-solvents usually have high requirements for operational safety, causing environmental pollution and human health as well as high costs

Method used

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  • A porous monoionic conductive polymer electrolyte membrane and a preparation method and application thereof
  • A porous monoionic conductive polymer electrolyte membrane and a preparation method and application thereof
  • A porous monoionic conductive polymer electrolyte membrane and a preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] An embodiment of the present invention provides a porous single-ion conductive polymer electrolyte membrane, and the film-forming material of the electrolyte membrane is a single-ion conductive polymer electrolyte and a polymer binder.

[0028] The mass fraction of the single ion conducting polymer electrolyte is 30-70%.

[0029] Single-ion-conducting polymer electrolytes use polymer materials as skeleton materials, and lithium salts are embedded in them.

[0030] The skeleton material includes one or more of polyamide, polyimide, polyarylether, benzimidazole, polyethylene, polyvinyl fluoride, polyurethane, polyester and polyphosphazene.

[0031] The lithium salt includes one or more of lithium bissulfonylimide, sp3 hybrid boron, lithium sulfonate and lithium phosphate.

[0032] The polymer binder includes one or more of polyvinylidene fluoride and its derivatives, polyacrylonitrile, polyamide, polyimide, polyarylether, polymethyl methacrylate and polybenzimidazole.

...

Embodiment 2

[0042] Embodiments of the present invention provide a porous single-ion-conducting polymer electrolyte membrane, the raw materials are all-aromatic polyamide single-ion-conducting polymer electrolyte (fa-PA-SIPE) and poly(vinylidene fluoride-cohexafluoropropylene) ) (PVDF-HFP) binder, the mass ratio of PVDF-HFP and fa-PA-SIPE is 1:1, and it is made into 15wt.% NMP casting solution. Chloroform was used as a non-solvent.

[0043] Please refer to figure 1 According to the method of Example 1, the prepared porous single-ion conductive polymer electrolyte membrane was prepared, and the microscopic morphology of the electrolyte membrane was obtained as figure 2 Shown, porosity, liquid absorption, tensile strength properties are shown in Table 1.

[0044] Porosity, liquid absorption, tensile strength of table 1 membrane

[0045]

Embodiment 3

[0047] Embodiments of the present invention provide a porous single-ion-conducting polymer electrolyte membrane, the raw materials are all-aromatic polyamide single-ion-conducting polymer electrolyte (fa-PA-SIPE) and poly(vinylidene fluoride-cohexafluoropropylene) ) (PVDF-HFP) binder, the mass ratio of PVDF-HFP and fa-PA-SIPE is 1:1, and it is made into 15wt.% NMP casting solution. Water was used as a non-solvent.

[0048] Please refer to figure 1 According to the method of Example 1, the prepared porous single-ion conductive polymer electrolyte membrane was prepared, and the microscopic morphology of the electrolyte membrane was obtained as image 3 Shown, porosity, liquid absorption, tensile strength properties are shown in Table 2.

[0049] Porosity, liquid absorption, tensile strength of table 2 membrane

[0050]

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Abstract

The invention discloses a porous single-ion conductive polymer electrolyte membrane, wherein the film-forming raw materials of the electrolyte membrane are single-ion conductive polymer electrolyte and polymer binder. Also included is a preparation method and application of a porous monoionic conductive polymer electrolyte membrane. The invention improves a series of problems such as ionic conductivity and interface compatibility between the membrane and the electrode by preparing a high-porosity electrolyte membrane through a rapid non-solvent induced phase separation method, and provides a simple preparation method for a high-performance microporous SIPE used in a lithium ion battery, which can be widely commercialized.

Description

technical field [0001] The invention relates to the technical field of advanced lithium-ion batteries, in particular to a porous single-ion conductive polymer electrolyte diaphragm and its preparation method and application. Background technique [0002] Although lithium-ion batteries (LIBs) have become one of the widely used power sources for electric vehicles, they are still subject to continuous living demands in the market for higher energy density and safety concerns. As one of the most critical components in LIB devices, the polymer electrolyte plays a vital role in preventing the physical contact between the anode and cathode and providing an ion transport pathway between the electrodes. The currently used polyolefin separator / liquid electrolyte systems suffer from several major disadvantages as follows: (1) The low glass transition temperature and melting point of polyolefin-based separators subject them to severe thermal shrinkage at high temperatures, which may inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/446H01M50/491H01M50/497
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 张运丰程寒松董佳明
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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