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 comprises a non-fluorinated polymer electrolyte and a hydrophobic polytetrafluoroethylene porous membrane. The polymer composite electrolyte membrane has the characteristics of being ultralow in size change ratio, high in ion exchange capacity, and low in cost. According to the polymer composite electrolyte membrane, the non-fluorinated polymer electrolyte and the hydrophobic polytetrafluoroethylene porous membrane are composited, thus the problem that non-fluorinated polymer electrolyte and the hydrophobic polytetrafluoroethylene porous membrane cannot be completely soaked in each other can be overcome; and meanwhile, the problem of composite membrane anisotropism caused by high-price hydrophilic polytetrafluoroethylene porous membranes can be avoided; the durability of the polymer electrolyte can be greatly improved, and the service life is greatly prolonged; and the polymer composite electrolyte membrane has a clear application prospect.

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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