A kind of manganese oxide/nickel microsphere with porous structure and its preparation and application
A porous structure, manganese oxide technology, applied in structural parts, electrochemical generators, electrical components, etc., can solve the problems of poor conductivity, poor actual capacity and cycle stability of materials, and easily damaged structure, so as to achieve less impurities, The effect of controllable product morphology, enhanced specific capacity and cycle stability
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example 1
[0031] Add manganese acetate and nickel acetate into 10 mL of deionized water at a molar ratio of 2:1. The total ion concentration of manganese and nickel is 0.15 mol / L. Stir until clear at room temperature. Add urea to water in a ratio of 1.5:1 molar ratio to metal ions, and stir until clear. Add 20 mL of ethylene glycol to the prepared mixed solution, mix evenly and transfer to a 50 mL hydrothermal reaction kettle, and hydrothermally heat it at 180°C for 30 hours. The resulting product was centrifuged and washed with water and ethanol several times, and then dried at 70°C. The obtained precursor was placed in a tube furnace at a heating rate of 5°C / min to 500°C, and the protective atmosphere was argon. After holding for 2 hours, a porous manganese oxide / nickel microsphere was obtained. Analyze the obtained samples with Rigaku D / max-2500 X-ray diffraction analyzer, and the results are as follows figure 1 Shown. The sample was observed with the Nova NanoSEM 230 scanning elect...
Embodiment 2
[0033] Add manganese acetate and nickel acetate into 10 mL deionized water at a molar ratio of 4:1. The total ion concentration of manganese and nickel is 0.2 mol / L. Stir until clear at room temperature. Add urea to the water at a molar ratio of 5:1 to the metal ion, and stir until it is clear. Add 20 mL of isopropanol to the prepared mixed solution, mix well and transfer to a 50 mL hydrothermal reactor, and hydrothermally heat it at 200°C for 20 hours. The resulting product was centrifuged and washed several times with water and ethanol, and then dried at 70°C. The obtained precursor was placed in a tube furnace at a temperature increase rate of 8°C / min to 400°C, and the protective atmosphere was argon. After holding for 7 hours, porous structured manganese oxide / nickel microspheres were obtained. The sample was observed with the Nova NanoSEM 230 scanning electron microscope of FEI company in the United States, and it was found that the spindle-shaped particles were uniformly...
Embodiment 3
[0035] Add manganese acetate and nickel acetate into 10 mL of deionized water at a molar ratio of 8:1. The total ion concentration of manganese and nickel is 0.5 mol / L. Stir until clear at room temperature. Add urea to the water at a molar ratio of 6:1 to metal ions, and stir until clear. Add 20 mL of methanol to the prepared mixed solution, mix well and transfer to a 50 mL hydrothermal reactor, and hydrothermally heat it at 100°C for 35 hours. The resulting product was centrifuged and washed several times with water and ethanol, and then dried at 70°C. The obtained precursor was placed in a tube furnace at a heating rate of 3°C / min to 600°C, and the protective atmosphere was argon. After holding for 2 hours, a porous manganese oxide / nickel microsphere was obtained.
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