A kind of polymer composite electrolyte membrane and preparation method thereof

Abstract

The invention provides a polymer composite electrolyte membrane and a preparation method thereof. The polymer composite electrolyte membrane includes a non-fluorine polymer electrolyte and a hydrophobic polytetrafluoroethylene porous membrane. The polymer composite electrolyte membrane has the characteristics of ultra-low dimensional change rate, high ion exchange capacity, low cost and the like. The invention realizes the composite of the non-fluoropolymer electrolyte solution and the hydrophobic polytetrafluoroethylene porous membrane by using the solvent as the medium, overcomes the problem that the non-fluoropolymer electrolyte solution and the hydrophobic polytetrafluoroethylene porous membrane cannot infiltrate each other at all, and At the same time, it avoids the use of expensive hydrophilic polytetrafluoroethylene porous membrane and the resulting anisotropy of the composite membrane, so that the durability and service life of the polymer electrolyte are greatly improved, and the application prospect is clearer.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte membranes, in particular to a polymer composite electrolyte membrane comprising a non-fluorine polymer electrolyte and a hydrophobic polytetrafluoroethylene porous membrane and a preparation method thereof. Background technique [0002] Polymer electrolyte is a polymer ion conductor containing dissociable ionic groups, which has ion conduction function, and is widely used in fuel cells, liquid flow energy storage batteries, electrolysis of water to produce hydrogen, and chlor-alkali chemical industry. Because of its high-efficiency conductivity and the unique characteristics of light weight, good elasticity, and easy processing of polymers, it has become a hot spot in research and development in the fields of electrochemistry and chemical industry. At present, polymer electrolytes are mainly used in the fields of lithium-ion batteries or fuel cells and are often used in the form of membranes. F...

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Problems solved by technology

However, due to the low degree of industrialization of electrospinning technology, the price of nanofiber membranes is high and the mechanical strength is low, it is difficult to effectively reduce the overall cost of composite membranes

[0006] Therefore, although the various polymer composite electrolyte membranes and their preparation methods proposed in the above-mentioned documents 1 to 5 all try to reduce the dimensional change rate by using polymer electrolyte materials and porous membranes, they have their own defects: or reduce However, the reduction of the ion exchange capacity, or the increase of the process / raw material cost has not fundamentally solved the problem of how to reduce the dimensional change rate of the polymer electrolyte membrane at a low cost.

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