Preparing method of nanometer nickel-cobalt-sulphur particles serving as positive electrode of lithium sulphur battery

Abstract

The invention relates to a preparing method of nanometer nickel-cobalt-sulphur particles serving as a positive electrode of a lithium sulphur battery. The preparing method comprises the steps of dissolving cobalt nitrate hexahydrate, nickel nitrate hexahydrate and sodium acetate into a solvent, adding potassium peroxodisulfate or ammonium persulfate, stirring, pouring the mixture into a reaction kettle to be reacted, cooling, washing, centrifuging, drying, dissolving the mixture into a solvent, conducting ultrasonic treatment, adding sodium sulfide nonahydrate, putting the mixture into the reaction kettle to be reacted, cooling, washing, centrifuging and drying to obtain the nanometer nickel-cobalt-sulphur particles. The preparing method is simple, feasible, safe, and environmentally friendly, raw materials are easy to obtain, the cost is low, and the preparing method is suitable for large-scale production; the prepared nanometer nickel-cobalt-sulphur particles have small size, the specific area is increased, the nickel-cobalt-sulphur particles have a good effect of fixing polysulfide, and the shuttling effect of the battery is obviously weakened. Besides, compared with oxides andbinary sulfides which are used for sulfur fixation generally, nickel-cobalt-sulphur has good electrical conductivity. On the condition that a certain specific capacity is guaranteed, the circulating stability of the battery is improved, and the preparing method has a huge potential in solving the current problem existing in lithium sulphur batteries.

Description

technical field [0001] The invention belongs to the field of preparation of ion battery electrode materials, in particular to a preparation method of nano-nickel-cobalt-sulfur particles used as positive poles of lithium-sulfur batteries. Background technique [0002] The efficient utilization and storage of energy has always been a major scientific and technological problem in the development of energy. During this period, lithium-ion batteries have entered people's lives as a high-load, portable device. Lithium-sulfur batteries have a high theoretical specific capacity (1675mAh / g), which is far higher than the current graphite-based lithium battery. ion battery (372mAh / g), thus becoming a promising next-generation energy storage device. However, in addition to the disadvantages of traditional lithium-ion batteries, lithium-sulfur batteries have more serious problems: metal lithium will gradually generate lithium dendrites during charging and discharging, which will eventua...

AI Technical Summary

Problems solved by technology

However, in addition to the disadvantages of traditional lithium-ion batteries, lithium-sulfur batteries have more serious problems: metal lithium will gradually generate lithium dendrites during charging and discharging, which will eventually pierce the separator and cause a short circuit of the battery; Lithium, so the sealing performance of the battery is very high; the discharge intermediate product lithium polysulfide can be dissolved in the electrolyte, and react with the metal lithium as the electrolyte reaches the negative electrode during the charging and discharging process, resulting in serious degradation of battery performance; sulfur The simple substance is an insulator, and the internal resistance of the battery is very large; the density of the final product lithium sulfide is lower than that of sulfur alone, which makes the volume of the positive electrode expand and destroy the battery structure

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