Nitrogen-doped hierarchical porous carbon electrode material and application thereof
A technology of graded porous and electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of uneven activation of samples, environmental pollution, high corrosiveness requirements, etc., and achieves low preparation cost, simple steps, The effect of good rate capability
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Embodiment 1
[0028] Add 5g of bovine bone powder into a corundum porcelain boat, then place it in a high-temperature carbonization furnace, under an inert atmosphere, at 2.5°C min -1 The heating rate was increased to 1100 °C, and the temperature was maintained for 1 h. The obtained product was acid-washed with 1M dilute hydrochloric acid, and then washed with deionized water until neutral drying to obtain a nitrogen-doped hierarchical porous carbon electrode material ( figure 1 ). Its specific surface area is 2050 m 2 g -1 , the pore volume is 1.90 cm 3 g -1 , The average pore size is 3.89 nm, and the nitrogen content is 1.8%.
[0029] Mix the nitrogen-doped hierarchical porous carbon electrode material obtained above, acetylene black, and binder PVDF in a mass ratio of 8:1:1, and grind them thoroughly with N-methylpyrrolidone to prepare a uniform paste, and then apply it evenly. coated on a circular copper foil, and then dried in a vacuum oven at 120 °C for 12 h. The button-type ...
Embodiment 2
[0033]The operating conditions are the same as in Example 1, except that the animal bone used is pig bone. The nitrogen-doped hierarchical porous carbon electrode material has a specific surface area of 2015 m 2 g -1 , the pore volume is 1.85 cm 3 g -1 , The average pore size is 3.95nm, and the nitrogen content is 1.6%.
[0034] Adopt the method identical with embodiment 1 to carry out electrochemical test, the result shows, current density is 1 A g -1 After 300 cycles, the specific capacity can still be maintained at 1710 mAh g -1 , with a current density of 10 A g -1 After 1000 cycles, the specific capacity can still be maintained at 630 mAh g -1 The reversible specific capacities at step current densities are 1125, 942, 665, 485, 340, 275 mAh g, respectively -1 .
Embodiment 3
[0036] Operating conditions are the same as in Example 1, except that the heating rate is 5 °C min -1 . The obtained nitrogen-doped hierarchical porous carbon electrode material has a specific surface area of 2025 m 2 g -1 , the pore volume is 1.88 cm 3 g -1 , The average pore size is 3.90 nm, and the nitrogen content is 1.8%.
[0037] Adopt the method identical with embodiment 1 to carry out electrochemical test, the result shows, current density is 1 A g -1 After 300 cycles, the specific capacity can still be maintained at 1720 mAh g -1 , with a current density of 10 A g -1 After 1000 cycles, the specific capacity can still be maintained at 628 mAh g -1 The reversible specific capacities at step current densities are 1121, 940, 662, 480, 338, 278 mAh g, respectively -1 .
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