Sulfurized polyacrylonitrile coated iron sulfide nanoparticles and application thereof as sodium ion capacitor negative electrode material

Abstract

The invention discloses sulfurized polyacrylonitrile coated iron sulfide nanoparticles and application thereof as a sodium ion capacitor negative electrode material. The preparation method of the sulfurized polyacrylonitrile coated iron sulfide nano-particles comprises the following steps: (1) dissolving iron salt in water, then heating to carry out hydrolysis reaction, and after the reaction is completed, filtering, washing and drying the product to obtain iron oxide nano-particles; (2) dissolving polyacrylonitrile powder in a solvent to prepare a polyacrylonitrile solution; (3) dispersing the iron oxide nanoparticles into a polyacrylonitrile solution, stirring to obtain a turbid liquid, and then filtering, washing and drying to obtain a polyacrylonitrile-coated iron oxide compound; and (4) mixing the polyacrylonitrile-coated iron oxide compound with sulfur powder, and heating and calcining the mixture in inert gas. The sulfurized polyacrylonitrile coated iron sulfide nanoparticles have the advantages of high specific capacity, stable cycle performance, high initial coulombic efficiency, low self-discharge rate, less gas production and the like.

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