Graphene derivative lithium salt, its preparation method, positive electrode and supercapacitor
A graphene and derivative technology, applied in the field of supercapacitor, graphene derivative lithium salt and preparation thereof, can solve the problems of complex process, low cycle life, poor thermal stability, etc., and achieve the effect of low preparation cost and simple operation
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[0026] The preparation method of a kind of graphene derivative lithium salt that this specific embodiment provides, such as figure 1 shown, including the following steps:
[0027] S1. Add graphite oxide powder into a container (such as a three-necked bottle), then add lithium metal (for easy reaction, preferably micron-sized lithium metal particles) and liquid ammonia into the container, and stand at -33°C for 12 hours ; Evaporate excessive liquid ammonia subsequently, and add the methyl alcohol of 100ml to container again; Then, remove excessive metallic lithium, obtain graphene oxide lithium salt through filtration at last; Wherein, the mass ratio of metallic lithium and graphite oxide powder is 1: 0.03; the reaction mechanism is: metal lithium is a reducing agent, which plays the role of reducing carbonyl on graphene;
[0028] S2. Reacting the graphene oxide lithium salt and ethylene oxide at 80-150° C. and 0.2-0.5 MPa for 1-10 hours, then evaporating and removing excess e...
Embodiment 1
[0046] The technical process that the present invention prepares graphite oxide is as follows:
[0047] (1) Graphite: 99.5% purity.
[0048](2) Graphite oxide: Add 20g of 50 mesh graphite powder, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6h, wash until neutral, and dry. Add the dried sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water . After 15 minutes, add 2.8L of deionized water (which contains 50mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration while hot, and then wash with 5L of 10% hydrochloric acid, suction filtration, Graphite oxide was obtained by vacuum drying at 60°C for 48 hours.
[0049] (3) Graphene oxide lithium salt: put 30mg of graphite oxi...
Embodiment 2
[0052] The technical process that the present invention prepares graphite oxide is as follows:
[0053] (1) Graphite: 99.5% purity.
[0054] (2) Graphite oxide: Add 20g of 50 mesh graphite powder, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6h, wash until neutral, and dry. Add the dried sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water . After 15 minutes, add 2.8L of deionized water (which contains 50mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration while hot, and then wash with 5L of 10% hydrochloric acid, suction filtration, Graphite oxide was obtained by vacuum drying at 60°C for 48 hours.
[0055] (3) Graphene oxide lithium salt: put 90mg of graphite ox...
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