Graphitized carbon-coated porous carbon sphere with high specific surface area as well as preparation method and application thereof

[0033] Example 1

[0034] 1. Pour ammonia water, absolute ethanol and distilled water into a three-necked flask in a volume ratio of 1:80:200, stir and mix evenly to obtain solution A.

[0035] 2. Add 0.2 g of resorcinol to solution A, and stir until it is completely dissolved to obtain solution B. Then, 0.28 mL of formaldehyde was added to solution B, stirred, and heated in a water bath at 100 °C for 24 h to obtain a phenolic resin polymer solution. The phenolic resin polymer solution was hydrothermally reacted at 100° C. for 24 h, centrifuged, washed with suction and dried to obtain phenolic resin nanospheres.

[0036] 3. The phenolic resin nanospheres were placed in a tube furnace in a nitrogen atmosphere, and calcined at 800° C. to obtain carbon nanospheres (CS).

[0037] 4. Using KOH as an activator, CS:KOH mass ratio of 1:1 is used to activate CS for pore formation. After the reaction, the excess KOH was washed off and dried to obtain nanocarbon spheres (HSCS) with high

[0041] Example 2

[0042] Table 1 is at 200mA g -1 Effect of activation mass ratio (CS:KOH) on electrochemical performance of electrode materials under constant current charge and discharge. The difference from Example 1 is that the mass ratio of CS to KOH is different. It can be seen from Table 1 that with the increase of the mass ratio of CS and KOH, the specific capacity of the first charge and discharge is improved, but the efficiency value is basically in a stable state.

[0043] Table 1 Effects of (CS:KOH) mass ratio on the electrochemical properties of electrode materials

[0044]

[0045] Example 3

[0046] Table 2 is at 200mA g -1 Effects of carbon coating on electrochemical properties of materials under constant current charge-discharge conditions. Unlike Example 2, the carbon was not coated with nickelocene. It can be seen from Table 2 that the increase in the mass ratio of CS and KOH results in a larger change in the specific capacity of the first discharge than the change of the specific capacity of the first charge, resulting in a decrease in the efficiency value.

[0047] Table 2 Effect of carbon coating on electrochemical properties of electrode materials

[0048]