Based on 3d graphene@mno lithium ion capacitor and its preparation method
A graphene and capacitor technology, applied in the field of 3D graphene@MnO lithium-ion capacitors and its preparation, can solve the problems of unsatisfactory capacitance performance and stable cycle performance, and solve the problems of easy agglomeration and stacking, simple preparation method, increased The effect of bulk capacitance performance
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Embodiment 1
[0039] The preparation method based on 3D graphene@MnO lithium ion capacitor comprises the following steps:
[0040] 1) Mix 50mL hydrogen peroxide aqueous solution and 500mL 5mg / mL graphene oxide aqueous solution, stir for 1h and sonicate for 30min to obtain mixed solution A, then heat the mixed solution A to 100°C, keep stirring for 6h, centrifuge and wash Vacuum drying at 60°C for 12 hours to obtain porous graphene oxide;
[0041] 2) Add 0.2g porous graphene oxide, 0.3g ascorbic acid and 0.06g sodium hydroxide synthesized in step 1) into water, stir at room temperature for 1h, and ultrasonically treat for 1h to obtain a mixed solution B; transfer the mixed solution B to a reaction kettle , placed in an oven at 80°C for hydrothermal reaction for 6 hours, and then vacuum-dried at 60°C for 12 hours after centrifugal cleaning to obtain porous 3D graphene;
[0042] 3) Add 0.1g of porous 3D graphene, 0.5g of potassium permanganate and 2.5g of urea synthesized in step 2) into 30mL...
Embodiment 2
[0047] The preparation method based on 3D graphene@MnO lithium ion capacitor comprises the following steps:
[0048] 1) Mix 100mL hydrogen peroxide aqueous solution and 1000mL 5mg / mL graphene oxide aqueous solution, stir for 1h and sonicate for 30min to obtain mixed solution A, then heat the mixed solution A to 100°C, keep stirring for 6h, centrifuge and wash Vacuum drying at 60°C for 12 hours to obtain porous graphene oxide;
[0049] 2) Add 0.4g porous graphene oxide, 0.6g ascorbic acid and 0.12g sodium hydroxide synthesized in step 1) into water, stir at room temperature for 1h, and ultrasonically treat for 1h to obtain mixed solution B; transfer mixed solution B to the reaction kettle , placed in an oven at 80°C for hydrothermal reaction for 6 hours, and then vacuum-dried at 60°C for 12 hours after centrifugal cleaning to obtain porous 3D graphene;
[0050] 3) According to the mass ratio of 1:5:25, 0.2g porous 3D graphene, 1g potassium permanganate and 5g urea synthesized ...
Embodiment 3
[0055] The preparation method based on 3D graphene@MnO lithium ion capacitor comprises the following steps:
[0056] 1) Mix 150mL hydrogen peroxide aqueous solution and 1500mL 5mg / mL graphene oxide aqueous solution, stir for 1h and sonicate for 30min to obtain mixed solution A, then heat the mixed solution A to 100°C, keep stirring for 6h, centrifuge and wash Vacuum drying at 60°C for 12 hours to obtain porous graphene oxide;
[0057] 2) 0.6g porous graphene oxide, 0.9g ascorbic acid and 0.18g sodium hydroxide synthesized in step 1) were added to water, stirred at room temperature for 1h, and ultrasonically treated for 1h to obtain a mixed solution B; the mixed solution B was transferred to the reaction kettle , placed in an oven at 80°C for hydrothermal reaction for 6 hours, and then vacuum-dried at 60°C for 12 hours after centrifugal cleaning to obtain porous 3D graphene;
[0058] 3) Add 0.3g of porous 3D graphene, 1.5g of potassium permanganate and 7.5g of urea synthesized...
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