Preparation method and application of n,s co-doped carbon/tin disulfide composite material

Abstract

The invention belongs to the technical field of material synthesis, and discloses a method for preparing an N, S co-doped carbon / tin disulfide composite material. In the method, tetraphenyltin is used as tin source and carbon source, and thiourea is used as nitrogen. source and sulfur source, including the following steps: put tetraphenyltin and thiourea into porcelain boats respectively and place them in a tube furnace filled with argon, and seal them; heat up the tube furnace to 500 °C at 5 °C / min, Insulate for 1~3h, and cool down to room temperature naturally to obtain the target product. The method directly synthesizes the N, S co-doped carbon / tin disulfide composite material in one step, and the method does not need cumbersome steps such as separation and washing, which is simple, quick, time-saving and labor-saving. The product obtained by the method has high purity, and when used as a negative electrode material of a potassium ion battery, it has the characteristics of high potassium storage capacity and excellent cycle stability.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a preparation method and application of an N, S co-doped carbon / tin disulfide composite material. Background technique [0002] Potassium-ion batteries are expected to be applied in the field of large-scale energy storage due to the advantages of rich potassium resources and fast conduction of potassium ions in the electrolyte. The development of high-capacity potassium-ion battery materials has become a research focus. As a negative electrode material for potassium ion batteries, tin disulfide has the advantages of high theoretical capacity, easy preparation, and low price, but its volume expands greatly during charging and discharging, and the intermediate product of potassium polysulfide dissolves in the electrolyte, which will lead to its cycle. Poor stability. Hybridizing carbon-based materials with tin disulfide to prepare composite materials is an effective metho...

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Problems solved by technology

As a negative electrode material for potassium ion batteries, tin disulfide has the advantages of high theoretical capacity, easy preparation, and low price, but its volume expands greatly during charge and discharge, and the intermediate product of potassium polysulfide dissolves in the electrolyte, which will lead to its cycle. poor stability

Although there are many methods to realize the preparation of tin disulfide and carbon matrix composites, such as solid phase method, precipitation method, hydrothermal or solvothermal synthesis method, etc., the synthesis process of these methods is relatively complicated at present, and separation and washing are required. cumbersome steps, time-consuming and energy-consuming

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