A kind of cobalt diselenide/carbon nanometer material and its preparation method and application
A technology of carbon nanomaterials and cobalt diselenide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve collapse, volume expansion, lithium-ion battery cycle stability and poor rate performance and other problems, to achieve the effect of slowing down the volume change, improving the cycle life, and being suitable for large-scale production
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[0034] The preparation method of above-mentioned cobalt diselenide / carbon nanometer material comprises the following steps:
[0035] (1) will grow a three-dimensional sheet of CoSe 2 The substrate of the layer is soaked in 0.05mol / L~0.2mol / L sucrose solution for more than 0.5h so that the CoSe 2 The surface of the layer is fully attached to the sucrose solution, the CoSe 2 The thickness of the layer is 1 μm to 2 μm, and the substrate is titanium sheet or titanium wire; during this process, it can also be sealed and heated at 180°C to 220°C at the same time, so that the sucrose in the sucrose solution undergoes a condensation reaction;
[0036] (2) The CoSe attached to the sucrose solution obtained in step (1) 2 Calcined at 400°C to 500°C under a protective gas atmosphere, so that the CoSe 2 The water in the sucrose solution on the surface evaporates, and the sucrose is carbonized into amorphous carbon, that is, the desired nanomaterial is obtained.
[0037]In the above pro...
Embodiment 1
[0047] (1) Ultrasonic cleaning of a 4×3cm titanium sheet with acetone, ethanol, 6mol / L dilute hydrochloric acid, and deionized water for 10 minutes, and put it into the lining of a 50ml autoclave;
[0048] (2) Dissolve 0.5mmol of cobalt nitrate, 2mmol of urea, and 5mmol of ammonium fluoride in 35ml of deionized water, transfer to the lining of the autoclave, and put it into an oven at 120°C for 10h;
[0049] (3) Naturally cool to room temperature after the reaction, take out the titanium sheet and wash it three times with deionized water, dry it at 60°C for 6h, take out the dried sample and calcinate it in a muffle furnace at 350°C for 2h to obtain the Co grown on the titanium sheet 3 o 4 Nanowires with an average diameter of 58 nm.
Embodiment 2
[0051] (1) Mix 0.08g of selenium powder, 0.375g of sodium hydroxide, and 35ml of deionized water for 20 minutes, transfer it to the lining of a 50ml high-pressure reactor, put it in a 220°C oven for 12 hours, and cool it down to room temperature naturally to obtain a selenium precursor body fluid;
[0052] (2) Add the Co prepared in Example 1 to the selenium precursor liquid of step (1) 3 o 4 Nanowires were placed in an oven at 180°C for 12 hours. After the reaction, they were naturally cooled to room temperature. The titanium sheets were taken out and washed three times with 1mol / L dilute hydrochloric acid and deionized water, and dried in vacuum at 60°C for 8 hours. The three-dimensional growth on the titanium sheets was observed. Flake-CoSe 2 layer, that is, cobalt diselenide / titanium flakes are obtained.
[0053] (3) Dissolve 1.79g of sucrose in 35ml of deionized water, transfer it to the lining of a 50ml autoclave, put the cobalt diselenide / titanium sheet prepared in s...
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