Carbon microsphere coated zinc oxide nanosheet material and preparation method and application thereof
A technology of zinc oxide nano and carbon microspheres, which is applied in the preparation/purification of carbon, zinc oxide/zinc hydroxide, nanotechnology, etc., and can solve the problem that the cycle specific capacity needs to be improved.
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[0023] The invention provides a method for preparing a carbon microsphere-wrapped zinc oxide nanosheet material, comprising the following steps:
[0024] Mix zinc oxide nanosheets with glucose solution and perform hydrothermal reaction to obtain glucose-coated zinc oxide nanosheets;
[0025] The glucose-wrapped zinc oxide nanosheet is annealed to obtain the carbon microsphere-wrapped zinc oxide nanosheet material.
[0026] In the invention, the zinc oxide nano-sheet is mixed with the glucose solution and subjected to hydrothermal reaction to obtain the glucose-coated zinc oxide nano-sheet. In the present invention, the size of the zinc oxide nanosheets is preferably 0.2-0.6 μm, and the zinc oxide nanosheets preferably have a hexagonal wurtzite structure. In the present invention, the source of the zinc oxide nanosheets is not particularly limited, and commercially available products well-known to those skilled in the art can be used, and can also be prepared by methods well-k...
Embodiment 1
[0044] Prepare a zinc acetate solution with a concentration of 0.2 mol / L and a sodium hydroxide solution with a concentration of 0.8 mol / L, slowly add 75 mL of the sodium hydroxide solution to the 75 mL of the zinc acetate solution at a rate of 7.5 mL / min, and stir for 30 min Afterwards, hydrothermal reaction was carried out at 160°C for 5 h; the system obtained after the reaction was lowered to room temperature, and 300 mL of deionized water and 300 mL of absolute ethanol were used for suction filtration and washing successively. Vacuum drying at ℃ for 6 hours to obtain zinc oxide nanosheets;
[0045] Prepare a glucose solution with a concentration of 0.5 mol / L, place 0.5 g of zinc oxide nanosheets in 60 mL of glucose solution, and perform a hydrothermal reaction at 180 °C for 3 h after ultrasonic treatment for 30 min; cool the resulting system to room temperature, Sequentially use 300mL deionized water and 300mL absolute ethanol to perform suction filtration and washing. Aft...
Embodiment 2
[0050] The carbon microsphere-wrapped zinc oxide nanosheet material prepared in Example 1 was mixed with polyvinylidene fluoride (PVDF) and acetylene black in a mass ratio of 8:1:1, and dispersed in N-methylpyrrolidone (NMP ), make a slurry and coat it on one side of the copper foil, as the negative electrode of the lithium-ion battery, assemble the battery according to the order of the positive electrode shell / negative electrode / diaphragm / lithium sheet / foam nickel / negative electrode shell (the composition of the electrolyte used is LiPF 6 , ethylene carbonate (EC) and diethyl carbonate (DEC), LiPF in the electrolyte 6 The concentration is 1mol / L, and the volume ratio of EC and DEC is 1:1), and a lithium-ion battery is obtained.
[0051] Figure 4 For the lithium-ion battery prepared in embodiment 2, the discharge specific capacity figure of 100 laps of the constant current charge and discharge test under the condition of 100mA / g current density is obtained by Figure 4 It ...
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