Preparation method nanometer Fe2SeS/C and sodium ion battery

Abstract

The invention belongs to the technical field of preparation of a transition metal selenium sulfide, and discloses a preparation method of nanometer Fe2SeS / C. The preparation method comprises the following steps of (1) sealing commercial Prussian blue with purity larger than 99%, selenium powder with purity larger than 99.9% and sulfur powder in a container filled with inertia atmosphere according to stoichiometric ratio; (2) sintering and cooling the container in the step (1) to a room temperature so as to obtain a product; and (3) rising a temperature of the obtained product to 700 DEG C under inertia protection atmosphere, and maintaining for 4 hours to obtain the nitrogen-doped and nanoscale Fe2SeS / C coated with a graphitized carbon layer. The invention also relates to a sodium ion battery employing the Fe2SeS / C prepared by the preparation method as a negative electrode material. The product is high in quality, available in raw material, simple in process and relatively low in equipment requirement; and moreover, the sodium ion battery shows stable sodium storage performance, excellent cycle stability and favorable rate performance.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of transition metal selenium sulfide, and more specifically relates to a preparation method of nano-iron selenium sulfide and a sodium ion battery. Background technique [0002] Transition metal selenium sulfur compounds are a general term for a class of multi-element materials formed by metals and selenium sulfur, which have very important research significance and potential application value. Iron selenide sulfide has a higher specific capacity of iron sulfide, and at the same time has the structural stability of iron selenide, and because it contains electroactive iron, iron selenide sulfide is expected to be used as a negative electrode material in sodium ion batteries. [0003] Fe 2 The synthesis method of SeS mainly focuses on the high-temperature solid-phase method. The high-temperature solid-phase method mainly uses elemental Fe, Se and S as raw materials, and mixes them a...

AI Technical Summary

Problems solved by technology

The preparation method of nano iron wire sulfide uses commercial Prussian blue as an iron source, adopts a simple process and low-cost preparation method to make Prussian blue, selenium powder and sulfur powder react at a certain temperature to directly generate nitrogen-doped Nanoscale iron selenide sulfide (such as Fe 2 SeS / C), thus effectively solving the problems of harsh synthesis conditions, cumbersome process and impure products of transition metal iron selenide sulfide, and the prepared nano iron selenium sulfide is uniformly coated with nitrogen-doped graphitized carbon layer , can not only prevent the agglomeration of nanoparticles, but also protect the iron selenium sulfide

Images