A preparation method of silicon dioxide/graphene nanocomposite material, negative electrode of lithium ion battery, lithium ion battery
A technology of nanocomposite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, nanotechnology, etc., can solve the problems of demanding raw material selection, impact on cycle performance, high cost, etc., achieve the best cycle stability, and the process is simple and reliable Environmental protection effect of control and operation process
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Embodiment 1
[0036] 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, the viscosity of the reactant increased, and the stirring was stopped to obtain a paste-like purple-red substance. After standing for 5 days, slowly add 500mL deionized water and 30mL H 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.
[0037] Hydrothermal process: Dissolve 70mg graphene oxide in 80mL deionized water, add 9mL concentrated sulfuric acid (ρ=1.84g / cm 3 ), ultrasonically dispersed for 3 hours, and then transferred to a reaction kettle, and reacted at a constant temperature of 160 ° C for 30 hours to obtain a three-dimensional columnar reduced graphene oxide,...
Embodiment 2
[0040] The preparation method of graphite oxide is with embodiment 1.
[0041] Hydrothermal process: Dissolve 80mg of graphene oxide in 80mL of deionized water, add 9mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, then transfer it to a reaction kettle, and react at a constant temperature of 210°C for 25 hours to obtain a three-dimensional columnar reduced graphene oxide. Wash collection.
[0042]Composite process: drop 30mL of absolute ethanol into 3mL tetraethyl orthosilicate to form a mixed solution, stir, add 14mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 15°C for 2 days, and then transfer it to In the reaction kettle, react at a constant temperature of 170°C for 24 hours, wash the product, dry it in vacuum at 70°C for 6 hours, and collect the silica / graphene nanocomposite material.
Embodiment 3
[0044] The preparation method of graphite oxide is with embodiment 1.
[0045] Hydrothermal process: Dissolve 90mg of graphene oxide in 80mL of deionized water, add 9mL of concentrated sulfuric acid, ultrasonically disperse for 3 hours, then transfer it to a reaction kettle, and react at a constant temperature of 260°C for 18 hours to obtain three-dimensional columnar reduced graphene oxide. Wash collection.
[0046] Composite process: drop 35mL of absolute ethanol into 3mL of butyl orthosilicate to make a mixed solution, stir, add 18mg of three-dimensional columnar reduced graphene oxide to the above mixed solution, soak at 15°C for 2 days, and then transfer it to In the reaction kettle, react at a constant temperature of 180°C for 18 hours, wash the product, dry it in vacuum at 60°C for 4 hours, and collect the silica / graphene nanocomposite material.
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