Preparation method of nickel-nickel molybdenum oxide-graphene composite material and its application in lithium-ion batteries
A nickel-molybdenum oxide and composite material technology, applied in the field of lithium-ion batteries, can solve the problems of large volume expansion, poor electrical conductivity, hindering practical application, etc., achieve excellent lithium storage performance, good composite effect, suitable for large-scale production effect
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Embodiment 1
[0024] Ultrasonic dispersion of 60 mg of graphite oxide in 30 ml of deionized water was performed for 3 h to obtain a graphene oxide dispersion. Add 120 mg NiCl 2 · 6H 2 O, after stirring at room temperature for 3 h, add 30 ml K 4 [Mo(CN) 8 ] solution (containing K 4 [Mo(CN) 8 ]124 mg), the resulting mixed solution was stirred at room temperature for 2 h, left to stand for 10 h, the product was centrifuged, washed with deionized water / absolute ethanol, and vacuum-dried at 60 °C for 24 h to obtain graphene-supported spherical Ni 2 [Mo(CN) 8 ] Nanoparticle precursors. The porcelain boat containing the precursor was placed in a tube furnace, fed with Ar gas, the temperature was programmed to 800 °C at a rate of 5 °C / min, and kept at this temperature for 20 min. When the temperature dropped to 300 °C, the Ar gas protection was removed, the atmosphere was changed to air, and oxidation was carried out at this temperature for 20 min to obtain the nickel-nickel molybdenum oxid...
Embodiment 2
[0030] Ultrasonic dispersion of 60 mg of graphite oxide in 30 ml of deionized water was performed for 3 h to obtain a graphene oxide dispersion. Add 120 mg NiCl 2 · 6H 2 O, after stirring at room temperature for 3 h, add 30 ml K 4 [Mo(CN) 8 ] solution (containing K 4 [Mo(CN) 8 ]124 mg), the resulting mixed solution was stirred at room temperature for 2 h, left to stand for 10 h, the product was centrifuged, washed with deionized water / absolute ethanol, and vacuum-dried at 60 °C for 24 h to obtain graphene-supported spherical Ni 2 [Mo(CN) 8] Nanoparticle precursors. The porcelain boat containing the precursor was placed in a tube furnace, fed with Ar gas, the temperature was programmed to 700 °C at a rate of 5 °C / min, and kept at this temperature for 20 min. When the temperature dropped to 300 °C, the Ar gas protection was removed, the atmosphere was changed to air, and oxidation was carried out at this temperature for 20 min to obtain the nickel-nickel molybdenum oxide...
Embodiment 3
[0033] Ultrasonic dispersion of 60 mg of graphite oxide in 30 ml of deionized water was performed for 3 h to obtain a graphene oxide dispersion. Add 120 mg NiCl 2 · 6H 2 O, after stirring at room temperature for 3 h, add 30 ml K 4 [Mo(CN) 8 ] solution (containing K 4 [Mo(CN) 8 ]124 mg), the resulting mixed solution was stirred at room temperature for 2 h, left to stand for 10 h, the product was centrifuged, washed with deionized water / absolute ethanol, and vacuum-dried at 60 °C for 24 h to obtain graphene-supported spherical Ni 2 [Mo(CN) 8 ] Nanoparticle precursors. The porcelain boat containing the precursor was placed in a tube furnace, fed with Ar gas, the temperature was programmed to 800 °C at a rate of 5 °C / min, and kept at this temperature for 10 min. When the temperature dropped to 300 °C, the Ar gas protection was removed, the atmosphere was changed to air, and oxidation was carried out at this temperature for 20 min to obtain the nickel-nickel molybdenum oxid...
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