Material for lithium-sulfur battery positive electrode and preparation method thereof
A lithium-sulfur battery and positive electrode technology, applied in the field of lithium-sulfur battery positive electrode materials and its preparation, can solve the problems of reducing the electrochemical performance of composite materials, the inability to synthesize composite materials with high efficiency, and reducing the tap density, so as to improve Coulombic efficiency and cycle stability, good cycle stability and Coulombic efficiency, the effect of reducing volume expansion
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[0030] Example 1
[0031] The material used for the positive electrode of the lithium-sulfur battery is a self-supporting mesoporous vanadium nitride nanowire / carbon nanotube composite material with a three-dimensional independent network structure.
[0032] The preparation method of the material comprises the following steps:
[0033] (1) Preparation of vanadium oxide nanowires: first, 0.1 g of ammonium metavanadate with a purity of 99% was added to 40 mL of deionized water, and stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 2, and the Stir for 1 hour at room temperature and transfer to a high pressure reaction kettle with a capacity of 60 mL and heat at 180 ° C for 24 hours for reaction. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is repeatedly washed with deionized water and ethanol. 3 time...
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[0036] Example 2
[0037] The preparation method of the material comprises the following steps:
[0038](1) Preparation of vanadium oxide nanowires: first, 0.3 g of ammonium metavanadate was added to 80 mL of deionized water, and stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 3, and stirred at room temperature for 2 h and Transfer to the reaction kettle and heat it at 190 °C for 24 hours to react. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is washed 5 times with deionized water and ethanol, and dried at 60 °C under vacuum conditions. 12h to obtain vanadium oxide nanowires;
[0039] (2) Preparation of mesoporous vanadium nitride nanowires: placing the vanadium oxide nanowires obtained in step (1) in a flow rate of 30sccmNH 3 The reaction was carried out by heating to 550°C at a heating rate o...
Example Embodiment
[0041] Example 3
[0042] The preparation method of the material comprises the following steps:
[0043] (1) Preparation of vanadium oxide nanowires: firstly, 0.2 g of ammonium metavanadate was added to 60 mL of deionized water, and stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 2, and stirred at room temperature for 2 h and Transfer to the reaction kettle and heat it for 24 hours at 170 °C for reaction. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is washed 4 times with deionized water and ethanol, respectively, and dried at 70 °C under vacuum conditions. 12h to obtain vanadium oxide nanowires;
[0044] (2) Preparation of mesoporous vanadium nitride nanowires: placing the vanadium oxide nanowires obtained in step (1) in a flow rate of 30sccmNH 3 The reaction was carried out by heating to 550°...
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