Application of 1
A Niobium pentaoxide/RGO nanocomposite anode material with stable structure, good electrical conductivity, excellent rate performance, simple preparation process, low energy consumption, low cost, and suitable for industrial production is prepared as follows:
The preparation method of niobium pentaoxide/rgo composite anode material includes the following steps :(1) the go nanosheet is mixed with water, stirred, and dispersed by ultrasound to obtain the dispersed solution of go nanosheet; (2) niobium chloride (V) dissolved in water, stirring, niobium pentachloride suspension, to niobium chloride (V) suspension in turn added organic solvents and hexamethyltetramine, stirring, white solution; (3) Mix the dispersed solution of GO nanoparticles with the white solution and stir until the dispersed solution is uniform to obtain the mixed solution. Put the obtained mixed solution into the high-pressure reaction kettle for hydrothermal reaction; (4) After the hydrothermal reaction is completed, the obtained precipitation is washed and dried to obtain solid powder; (5) Heat treatment of solid powder under argon atmosphere, that is. The method is easy to operate and the reaction conditions are controllable. The lithium battery made of composite anode material has excellent cycle and rate performance.
Application of 2
CN201711099962.7 reports a high permeability nano-infrared excitation medium which can efficiently absorb infrared short wave. The nano-infrared excitation medium is composed of 100 weight parts of water and 3-20 weight parts of nano-modified niobium oxide. Nano-modified niobium oxide is prepared by the following steps: At room temperature, 8-15 weight parts of niobium chloride (V) dissolved in 100 weight parts of absolute ethanol to get niobium chloride (V) ethanol solution, stand for 5-30 minutes; Add 1-5 weight of nano-silver oxide to niobium chloride (V) ethanol solution and mix evenly to get the first mixture; Keep stirring the first mixture, and drop 100 weight parts of ethanol aqueous solution into the first mixture at a speed of 3-10ml/min; Add 50-100 weight of N, N-dimethylformamide, keep stirring the first mixture for 30-60 minutes, stand at room temperature to get the second mixture; After drying, the dry substance is obtained. The dried material was calcined in Muffle furnace at 400-500 temperature to obtain nanometer modified niobium oxide. The nano-infrared excitation medium of the invention can deal with volatile organic compounds inside the plate.
Yellow white monoclinic crystal of niobium pentachloride. Soluble in ethanol and hydrochloric acid. It breaks down in water. It is prone to deliquescence. Hydrogen chloride dissolves in the moist air. From the dried niobium pentoxide hydrate, freshly distilled thionyl chloride was slowly added, and the reaction was carried out at room temperature by centrifugation precipitation to separate and remove the undissolved niobium pentoxide hydrate and the yellow crystalline compound (ammonium hexachlorobate), removing the thionyl chloride. Niobium pentachloride was isolated by continuous vacuum evaporation at room temperature under low vacuum for several hours, and the product was sublimated at a temperature of approximately 150°C for further purification, if required. Used in the manufacture of other niobium compounds.
Synthesis and Preparation:
A sample dish containing 10g of niobium powder was placed into a reaction tube made of borosilicate glass with an inner diameter of 25mm and a length of 900mm. The sample vessel was placed approximately 1 length from the inlet/section 3, and the air in the tube was replaced by noble gases, followed by dried chlorine. When chlorine gas flowed into the reaction tube at a rate of about 200 mL/min and the sample portion was heated to about 300°C, niobium pentachloride was analyzed as a yellow crystal at room temperature in the reaction tube.
The exhaust gas is introduced into a chlorine absorption bottle (containing a mixture of sodium hydroxide and sodium bicarbonate in aqueous solution) and is completely absorbed. After the reaction is complete, the chlorine gas is replaced by the noble gas by cooling, and niobium pentachloride is removed from the noble gas stream, or the two ends of niobium chloride (ⅴ) precipitated in the reaction tube are fused.
Niobium pentoxide can also be mixed with carbon at a molar ratio of 6 to allow chlorine gas to pass through by injecting the sample at a flow rate of 200 to 300 mL/min and chlorinating at 500 to 700°C.
Niobium pentachloride can also be prepared by passing a mixture of niobium penachloride and niobium trichloride niobium oxide NbOCl3 gas together with chlorine through a carbon layer heated to 600 ° C.