A preparation method of nickel oxide/graphene nanocomposite material, negative electrode of lithium ion battery, lithium ion battery
A nano-composite material and graphene technology are applied in the field of lithium-ion battery, lithium-ion battery negative electrode, and nickel oxide/graphene nano-composite preparation field, which can solve the performance degradation of lithium-ion battery, adverse graphene electronic conductivity, influence Graphene anode material cycle stability and other issues, to achieve the effect of low requirements for experimental equipment, easy storage, and good cycle performance
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Embodiment 1
[0039] Preparation of graphite oxide: weigh 5.0g graphite and 3.75g NaNO respectively 3 Put it into a 1L beaker, stir vigorously, slowly add 150mL of concentrated sulfuric acid, stir for 0.5 hours, then slowly add 20g of KMnO 4 , Added in 0.5 hours, and continued to stir for 20 hours, because the viscosity of the reactant increased, the stirring was stopped, and a paste-like purple-red substance was obtained. After standing for 5 days, slowly add 500mL deionized water and 30mLH 2 o 2 At this time, the color of the solution becomes more obvious bright yellow. After the solution is fully reacted, it is centrifuged and washed to obtain graphite oxide.
[0040] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 11mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 3 hours, then transfer it to a reactor, and react at a constant temperature of 200°C for 20 hours to obtain a three-dimensional columnar reduced graphene oxide, whic...
Embodiment 2
[0044] The preparation method of graphite oxide is with embodiment 1.
[0045] Hydrothermal process: Dissolve 90mg graphene oxide in 80mL deionized water, add 10mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically disperse for 2 hours, then transfer it to a reactor, and react at a constant temperature of 160°C for 24 hours to obtain a three-dimensional columnar reduced graphene oxide, which is washed and collected.
[0046] Composite process: Dissolve 2.0g of nickel nitrate and 4.0g of hexamethylenetetramine into water, add 18mg of three-dimensional columnar reduced graphene oxide into the above mixed solution, soak at 10°C for 2 days, and then transfer it to the reaction kettle In 160°C constant temperature reaction for 20 hours, the product was washed, vacuum dried at 50°C for 8 hours, and the product was collected.
[0047] Roasting process: take the product and roast it in the air at a constant temperature of 250° C. for 4 hours, cool it down to room temperature ...
Embodiment 3
[0049] The preparation method of graphite oxide is with embodiment 1.
[0050] Hydrothermal process: Dissolve 120mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 4 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 260 ° C for 20 hours to obtain three-dimensional columnar reduced graphene oxide, which was washed and collected.
[0051] Composite process: Dissolve 0.8g of nickel chloride and 1.4g of hexamethylenetetramine into water, add 24mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 30°C for 3 days, and then transfer it to the reaction In the kettle, react at a constant temperature of 200°C for 12 hours, wash the product, dry it under vacuum at 60°C for 4 hours, and collect the product.
[0052] Roasting process: take the product and roast it in the air at a constant temperature of 400°C for 2 hours, cool it down to...
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