Preparation method of graded porous hard carbon, hard carbon, application of hard carbon, negative electrode and electrode
A hierarchical porous, hard carbon technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of large irreversible capacity loss, large specific surface area, and low initial efficiency in the first cycle of the electrode, and achieve good electrochemical performance. High rate performance, improve the effect of the first effect
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Embodiment 1
[0047] (Preparation of agarose, sodium carbonate, nano-silica gel state blend precursor with microporous, mesoporous structure 3DPHC)
[0048] Weigh 2g of agarose, 1g of sodium carbonate and 1g of nano-silica (25±5nm) in a 250mL beaker, add 30ml of deionized water, heat in a water bath at 80°C and stir for 1h to obtain a mixture solution, then place the resulting mixture at room temperature Cool to 30°C while stirring to obtain 30 mL of milky white gel, continue stirring for 6 hours to make the milky white gel evenly mixed, freeze-dried the obtained gel under vacuum conditions of 40p, -40°C for 24h; the obtained solid powder was sintered at 1300°C under argon atmosphere 2h, from room temperature to sintering temperature at a heating rate of 5°C / min, cooled to 25°C, and ground to obtain an intermediate product of porous hard carbon; the obtained black powder was placed in a 250mL beaker, and 100mL of 3mol / L hydrofluoric acid aqueous solution was added to etch 8h to remove silic...
Embodiment 2
[0051] (Preparation of 3DPHC with microporous and macroporous structures from agarose, sodium carbonate, and polystyrene microsphere gel-state blend precursors)
[0052] Weigh 2g of agarose, 1g of sodium carbonate, 1mL of polystyrene microspheres (95±5nm) dispersion in a 250mL beaker, add 30ml of deionized water, heat in a water bath at 80°C and stir for 1h to obtain a mixture solution. Cool to 30°C at room temperature to obtain 30 mL of milky white gel, continue stirring for 6 hours to make the milky white gel evenly mixed, freeze-dried the obtained gel under vacuum conditions of 40p, -40°C for 24h, and sinter the obtained solid powder at 1300°C under argon atmosphere 2h, the heating rate was 5°C / min, the obtained black powder was placed in a 250mL beaker, washed three times in turn with deionized water and ethanol, centrifuged, and dried in an 80°C oven for 24h to obtain the final product 3DPHC. The pore size distribution of the product is as Image 6 As shown in Example 2,...
Embodiment 3
[0055] (3DPHC with mesoporous and macroporous structures prepared from agarose, nano-silica, and polystyrene microsphere gel-state blend precursors, the diameter difference between the two water-insoluble templates is greater than 10 nm)
[0056] Weigh 2g of agarose, 1g of nano-silica (25±5nm) and 1mL of polystyrene microspheres (95±5nm) dispersion in a 250mL beaker, add 30ml of deionized water, and heat in a water bath at 80°C and stir for 1h to obtain a mixture solution, the resulting mixture was cooled to 30 °C at room temperature to obtain 30 mL of milky white gel, continued to stir for 6 h to make the milky white gel evenly mixed, and the obtained gel was freeze-dried under vacuum conditions of 40p, -40 °C for 24 h, and the obtained solid powder was dried under argon. It was sintered at 1300 °C for 2 h in an air atmosphere, and the heating rate was 5 °C / min. The obtained black powder was placed in a 250 mL beaker, 100 mL of 3 mol / L hydrofluoric acid aqueous solution was ad...
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