Polyimide-derived nitrogen-doped carbon negative electrode material as well as preparation method and application thereof
A polyimide, nitrogen-doped carbon technology, applied in the field of electrochemical materials, can solve problems such as limited research on potassium ion capacitors, and achieve the effects of improving electrochemical performance, shortening distance, and high energy density
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Embodiment 1
[0032] 1) Preparation of polyimide
[0033] Weigh 1.78g of benzidine and dissolve in 60ml of dimethylformamide. After stirring evenly, 3.11 g of 3,3,4,4-benzophenone tetracarboxylic acid was added and stirred for 12 h under nitrogen atmosphere. The resulting yellow mixture was transferred to an autoclave and heated at 180 °C for 10 h. After cooling to room temperature, the sample was suction-filtered, washed 4-5 times with DMF and absolute ethanol, put into a petri dish and dried overnight in vacuum, and finally collected bright yellow polyimide powder.
[0034] 2) Preparation of nitrogen-doped carbon nanosheet microspheres
[0035] The polyimide powder was heated up to 900°C at a rate of 3°C / min under an inert atmosphere and kept for 90 minutes. Nitrogen-doped carbon nanosheet microspheres are obtained, hereinafter referred to as NCM.
[0036] The nitrogen-doped carbon nanoparticles obtained by the above method have a particle size of 600-800nm.
[0037] figure 1 The el...
Embodiment 2
[0040] In order to prepare NCM negative electrode, mix it with acetylene black, CMC according to 8:1:1, and coat it on the copper foil. When preparing the half-cell, potassium metal was used as the reference electrode. Use solutions A, B, and C as the electrolyte to assemble the negative electrode into a 2055-type button battery, and use solvent A as the electrolyte to assemble the positive electrode sheet into a 2055-type button battery. The half-cell assembly process was carried out in a glove box.
[0041] Solution A: 0.8mol L-1KPF 6 A mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1:1.
[0042] Solution B: 1mol L-1KPF 6 In the mixture of ethylene carbonate (EC), diethyl carbonate (DEC) and dimethyl carbonate (DMC) in a volume ratio of 1:1:1 and 2% of fluoroethylene carbonate (FEC) was added.
[0043] Solution C: 1mol L-1KPF 6 Mixture in Diethylene Glycol Dimethyl Ether (DIGLYME).
[0044] Then the assembled half-cells were subjec...
Embodiment 3
[0047] In this example, two different commercial activated carbons are used as positive electrode materials. The AC positive electrode and NCM method are the same, and two commercial activated carbons from different manufacturers are mixed with acetylene black and binder at a mass ratio of 8:1:1, and It was dissolved in N-methylpyrrolidone and spread on aluminum foil.
[0048] Figure 6 Two different commercial activated carbons AC-1 and AC-2 are shown at 0.1Ag -1 The life cycle of 100 cycles at a certain current density shows that the discharge specific capacity of AC-1 is significantly higher than that of AC-2. Therefore, NCM was used as the negative electrode material, AC-1 was used as the positive electrode material, and solvent A was used as the electrolyte to assemble a potassium ion hybrid capacitor.
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