Preparation method of modified powder polyvinylidene fluoride grafted styrene sulfonated electrolyte membrane

Abstract

The invention relates to a preparation method of a polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane, and belongs to the field of battery electrolyte materials. The method is as follows: firstly, polyvinylidene fluoride powder is dispersed in a methanol solution in a nitrogen atmosphere, and a quaternary ammonium base is added for mixing, sedimentation, filtration, drying to obtain modified polyvinylidene fluoride powder; the modified powder, styrene and benzoyl peroxide are added into methanol for heating in the nitrogen atmosphere for reaction, the precipitation is filtered, then extracted by use of trichloromethane, and then dried to obtain the modified polyvinylidene fluoride grafted styrene powder; the powder is dissolved in an organic solvent, stirred, cooled, spread on a glass plate, then dried, and sulfonated in concentrated sulfuric acid to obtain the electrolyte membrane. The modified modified polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane prepared by the preparation method is obtained by grafting of the styrene and then sulfonation on the basis of powder modification, and the polyvinylidene fluoride grafted styrene sulfonate electrolyte membrane is high in conductivity and low in methanol permeability, and simple in process, and can be adapted to mass production.

Description

technical field

[0001] The invention relates to a preparation method of a modified powder polyvinylidene fluoride grafted styrene sulfonated electrolyte membrane, belonging to the field of battery electrolyte materials. Background technique

[0002] Direct methanol fuel cell (DMFC) is a portable power source with great potential in the future. Proton exchange membrane is the core component of DMFC, and its performance directly affects the energy density and service life of DMFC. At present, the market is dominated by Nafion series membranes produced by DuPont, which have high methanol permeability and high preparation costs, and the actual application effect is not ideal. It has become the research of this technology to find proton exchange membranes with low cost and low methanol permeability. main direction.

[0003] Partially fluorinated sulfonic acid proton exchange membrane has attracted people's attention. People have successfully prepared polyvinylidene fluoride graf...