Two-dimensional transition metal sulfide micron sheet, positive electrode, battery and method
A technology of transition metals and sulfides, applied in the direction of secondary batteries, positive electrodes, battery electrodes, etc., can solve the problems of poor cycle stability and low specific capacity, and achieve the effect of high intrinsic conductivity and large discharge specific capacity
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[0039] figure 2 A schematic flow chart of a preparation method of a two-dimensional transition metal sulfide microsheet provided in the embodiment of the present application, as shown in figure 2 As shown, it mainly includes the following steps.
[0040]Step S201: After adding dopamine hydrochloride and transition metal source into the dispersant for mixing and dispersing, carry out liquid phase reaction in water bath.
[0041] In an optional embodiment, the transition metal is tungsten, and the above method is specifically:
[0042] Weigh dopamine hydrochloride and tungsten source according to a certain ratio, the mass ratio of dopamine hydrochloride and tungsten source is 11:3-8:3, and the tungsten source can be phosphotungstic acid, sodium tungstate, ammonium metatungstate or One, two or more combinations of ammonium paratungstate.
[0043] The weighed dopamine hydrochloride and tungsten source are added into the dispersant for mixing and dispersing, and a water bath l...
Embodiment 1
[0059] At room temperature, weigh 1.1g of dopamine hydrochloride and 0.3g of sodium tungstate, add them into a mixed solution of 20mL of ethanol and 15mL of deionized water for dispersion, and then transfer them to a water bath for liquid phase reaction in a water bath. The liquid phase temperature of the water bath is 40°C, the water bath liquid phase time is 7h. The product after the liquid-phase reaction in a water bath was centrifuged, washed with ethanol and deionized water, and then placed in a vacuum drying oven at a drying temperature of 70° C. for 12 hours. The dried sample powder was placed in a tube furnace and calcined at 500°C under a nitrogen atmosphere with a heating rate of 3°C min -1 , the calcination time is 5h, and the WO 3 Nanosheets. Then weigh 0.1g WO 3 The nanosheets were evenly mixed with 0.5 g of sulfur powder and transferred to a tube furnace for high-temperature solid-phase vulcanization treatment at a temperature of 600 °C for 5 h. After the rea...
Embodiment 2
[0061] At room temperature, weigh 1.1g of dopamine hydrochloride and 0.7g of sodium tungstate, add them into a mixed solution of 20mL of ethanol and 15mL of deionized water for dispersion, and then transfer them to a water bath for liquid phase reaction in a water bath. The liquid phase temperature of the water bath is 40°C, the water bath liquid phase time is 7h. The product after the liquid-phase reaction in a water bath was centrifuged, washed with ethanol and deionized water, and then placed in a vacuum drying oven at a drying temperature of 70° C. for 12 hours. The dried sample powder was placed in a tube furnace and calcined at 500°C under a nitrogen atmosphere with a heating rate of 3°C min -1 , the calcination time is 5h, and the WO 3 Nanosheets. Then weigh 0.1g WO 3 The nanosheets and 0.5g of sulfur powder were uniformly mixed and then subjected to high-temperature solid-phase vulcanization treatment in a tube furnace at a temperature of 600°C for 5 hours. After t...
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