Preparation method for nickel oxide/graphene nanocomposite, negative electrode of lithium ion battery and lithium ion battery
A nanocomposite material and lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of lithium-ion battery performance degradation, unfavorable graphene electronic conductivity, and affecting the cycle stability of graphene negative electrode materials, etc. , 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 three-dimensional columnar reduced graphene oxide, which ...
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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