Silicon carbide/graphene positive and negative electrode composite materials as well as preparation method and application thereof
A graphene negative electrode and composite material technology, which is applied in the direction of graphene, carbon compounds, chemical instruments and methods, etc., can solve complex problems such as the inability to prepare graphene in large areas, achieve high Fermi energy levels, and facilitate large-area Preparation and high mechanical properties
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Embodiment 1
[0068] A preparation method of silicon carbide / graphene negative electrode composite material, comprising the following steps:
[0069] Step 1: Preprocessing step
[0070] Firstly, the tantalum sheet is cleaned, then the polydimethylsiloxane solution is prepared and left to stand for use, and finally the static polydimethylsiloxane solution is evenly spread on the cleaned tantalum sheet, and then infrared baking, Let stand to make it solidify completely, obtain polydimethylsiloxane / tantalum sheet;
[0071] Specifically, the cleaning method is to grind the tantalum sheet with 70 mesh (212μm) coarse sand, and then use 220 mesh (68μm) fine sand to polish the tantalum sheet, and then use 99.7% alcohol to polish the tantalum sheet of 10mm*20mm*1mm Put it in an ultrasonic cleaning machine for ultrasonic cleaning for 10 minutes, then ultrasonically clean it with ultrapure water for 10 minutes, and then bake it under an infrared lamp for 5 minutes.
[0072] Specifically, the prepara...
Embodiment 2
[0085] A preparation method of silicon carbide / boron-doped graphene cathode composite material, comprising the following steps:
[0086] Step 1: a pretreatment step, the same as the method in step 1 in Example 1.
[0087] Step 2: Preparation of silicon carbide / boron-doped graphene cathode composite material by hot wire CVD, including the following steps:
[0088] 1) Open the chamber of the EA-HFCVD equipment, polish the inner wall of the chamber, polish the molybdenum stage of the sample deposition platform (φ60mm, thickness 5mm), and use a dust-free cloth (140mm*14 0mm*0.3mm) to dip in absolute ethanol (99.7%) Clean the polished molybdenum table and the inner surface of the chamber, and finally put the disassembled parts back in place. Cut 5 pieces of tantalum wire with a length of 18.5cm, hang the tantalum wire above the molybdenum table, place the polydimethylsiloxane / tantalum sheet obtained in step 1 in the middle of the molybdenum table, adjust the lifting table to conne...
Embodiment 3
[0099] A method for preparing a flexible water-based asymmetric capacitor, comprising the following steps:
[0100] Step 1: Electrode Preparation
[0101] The nickel foam (purity 99.8%, pore diameter 0.2-0.6mm, PPI 110, thickness 1mm) produced by Taiyuan Yingze Lizhiyuan Company was used in this experiment. Cut the nickel foam into a size of more than 1cm*3cm, take four pieces and put them into a 50mL beaker, add about 30mL to be diluted to 1 / 10 concentrated nitric acid solution to ensure that there is no nickel foam, and clean it in an ultrasonic cleaner for 10 minutes to remove nickel For the oxide layer on the surface of the foam, pour nitric acid into the waste liquid bucket, add ultrapure water, continue ultrasonication for 10 minutes, and then dry it under an infrared lamp;
[0102] The silicon carbide / graphene negative electrode composite material prepared in Example 1 and the silicon carbide / boron-doped graphene positive electrode composite material prepared in Exampl...
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