Hollow carbon sphere anchored with metal sulfide, preparation method of hollow carbon sphere and application of hollow carbon sphere in preparation of negative electrode of potassium ion battery
A metal sulfide, hollow technology, applied in the direction of battery electrodes, secondary batteries, electrode heat treatment, etc., to achieve the effect of shortening the transmission distance, improving electrical performance, and high reversible specific capacity
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Embodiment 1
[0045] Add 5 g of nickel acetylacetonate into a three-necked flask containing 50 mL of oleylamine, stir well, and continuously feed Ar. Raise the temperature to 250° C. and keep it warm for 1 hour to obtain nickel oxide particles uniformly dispersed in oleylamine, and then centrifuge to obtain nickel oxide particles. The resulting particles were washed and mixed with polymethylmethacrylate in 10 mL of N,N-dimethylformamide. In the case of 15kV, the feeding rate is 0.04mL / min, electrostatic spraying is carried out with an electrostatic sprayer to obtain uniform nickel oxide particles wrapped in polymethyl methacrylate balls. The product is added to 300mL water of 0.2g tris hydroxymethyl amino methane, add dopamine hydrochloride, and control the concentration of dopamine hydrochloride to be 0.5g L -1 . After stirring well for 12 h, the resulting product was collected by centrifugation. After vacuum drying, the temperature was kept at 450° C. for 2 h at a heating rate of 5° C....
Embodiment 2
[0048] Add 5 g of zinc acetylacetonate into a three-necked flask containing 50 mL of oleylamine, stir well, and continuously feed Ar. Raise the temperature to 250°C and keep it warm for 1 hour to obtain zinc oxide particles uniformly dispersed in oleylamine, and centrifuge to obtain nickel oxide particles. The resulting particles were washed and mixed with polymethylmethacrylate in 10 mL of N,N-dimethylformamide. In the case of 15kV, the feed rate is 0.04mL / min, electrostatic spraying is carried out with an electrostatic sprayer to obtain uniform zinc oxide particles wrapped in polymethyl methacrylate balls. The product was added to 300mL water containing 0.2g Tris, added dopamine hydrochloride, and the concentration of dopamine hydrochloride was controlled to be 0.6g L -1 . After stirring well for 4 h, the resulting product was collected by centrifugation. After vacuum drying, the temperature was kept at 450° C. for 2 h at a heating rate of 5° C. / min. After mixing the obt...
Embodiment 3
[0051] Put 5g of copper acetylacetonate and 50mL of oleylamine into a three-necked flask, stir well, and continuously feed Ar. Raise the temperature to 250°C and keep it warm for 1 hour to obtain copper oxide particles uniformly dispersed in oleylamine, and centrifuge to obtain nickel oxide particles. The resulting particles were washed and mixed with polymethyl methacrylate and 10 mL of N,N-dimethylformamide. In the case of 15kV, the feeding rate is 0.04mL / min, and electrostatic spraying is performed with an electrostatic sprayer to obtain uniform copper oxide particles wrapped in polymethyl methacrylate balls. The product is added to 300mL water containing 0.2g tris, add dopamine hydrochloride, and control the concentration of dopamine hydrochloride to be 0.7g L -1 . After stirring well for 2 h, the resulting product was collected by centrifugation. After vacuum drying, the temperature was kept at 450° C. for 2 h at a heating rate of 5° C. / min. After mixing the obtained ...
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