Graphene-Co2V2O7 composite material as well as preparation method and application thereof
A composite material, graphene technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unsatisfactory cycle performance and rate performance, unsatisfactory charge-discharge specific capacity, etc., to improve cycle performance and rate performance. , the experimental period is short, the effect of improving the rate performance
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Embodiment 1
[0029] A graphene-Co 2 V 2 o 7 A method for preparing a composite material, comprising the steps of:
[0030] ①Add graphene oxide into deionized water, the concentration of graphene oxide after adding is 0.3mg / mL, ultrasonically disperse for 4h, and the solution becomes a black suspension;
[0031] ②Add 0.09g of CoCl to the above solution 2 6(H 2 O), 0.70g of C6 h 12 N 4 , 0.23g of NH 4 VO 3 , continue to ultrasonically disperse for 30 minutes to obtain a khaki suspension;
[0032] ③Heat the above solution in a water bath at 70-80°C, and keep stirring for 3 hours, the solution turns bright yellow;
[0033] ④ Cool the above bright yellow solution to room temperature, wash it several times with deionized water and ethanol, dry it at 40°C for 6 hours, put it into a tube furnace, raise the temperature to 500°C at a heating rate of 0.5°C / min, and keep it for 2 hours , and finally get graphene-Co 2 V 2 o 7 composite material.
[0034] Graphene-Co prepared by the above ...
Embodiment 2
[0036] A graphene-Co 2 V 2 o 7 A method for preparing a composite material, comprising the steps of:
[0037] ① Add graphene oxide to deionized water, the concentration of graphene oxide after adding is 0.6mg / mL, ultrasonically disperse for 6h, and the solution becomes a black suspension;
[0038] ②Add 0.1g of CoCl to the above solution 2 6(H 2 O), 0.71g of C 6 h 12 N 4 , 0.24g of NH 4 VO 3 , continue to ultrasonically disperse for 60 minutes to obtain a khaki suspension;
[0039] ③Heat the above solution in a water bath at 80°C, and keep stirring for 4 hours, the solution turns bright yellow;
[0040] ④ Cool the above bright yellow solution to room temperature, wash it with deionized water and ethanol several times, dry it at 60°C for 8 hours, put it into a tube furnace, raise the temperature to 600°C at a heating rate of 1°C / min, and keep it for 2 hours , and finally get graphene-Co 2 V 2 o 7 composite material.
[0041] Graphene-Co prepared by the above metho...
Embodiment 3
[0043] A graphene-Co 2 V 2 o 7 A method for preparing a composite material, comprising the steps of:
[0044] ① Add graphene oxide into deionized water, the concentration of graphene oxide after adding is 0.4mg / mL, ultrasonically disperse for 5h, and the solution becomes a black suspension;
[0045] ②Add 0.095g of CoCl to the above solution 2 6(H 2 O), 0.705g of C 6 h 12 N 4 , 0.235g of NH 4 VO 3 , continue to ultrasonically disperse for 45 minutes to obtain a khaki suspension;
[0046] ③Heat the above solution in a water bath at 75°C, and keep stirring for 3.5 hours, the solution turns bright yellow;
[0047] ④ Cool the above bright yellow solution to room temperature, wash it several times with deionized water and ethanol, dry it at 50°C for 7 hours, put it into a tube furnace, raise the temperature to 550°C at a heating rate of 0.7°C / min, and keep it for 2 hours , and finally get graphene-Co 2 V 2 o 7 composite material.
[0048] Graphene-Co prepared by the a...
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