Different Atomic Research Supercapacitor Performance Porous Carbon Fiber And Contain

In this paper, the polymer fiber was prepared from melamine formaldehyde resin(MF) solution and polyvinyl alcohol (PVA) solution mixture by the electrospinningmethod. After carbonizing the polymer fiber, the heteroatom-enriched carbon fiber wasobtained. We added ammonium chloride and polyethylene glycol in the spinning dopesimultaneously in order to obtain the porous heteroatom-enriched carbon fiber electrodematerial. TheeHlectrodeHcan be directly made from the porous heteroatom-enrichedcarbon fiber without any binders, as the cathode and it is using electrodeposition ofnickel hydroxide as the anode, assembled winding supercapacitor and laminatedsupercapacitor. The materials were characterized by SEM, XPS, nitrogenadsorption/desorption and other methods. The electrochemical properties of materialsand supercapacitors were studied by the cyclic voltammetry test, galvanostaticcharge/discharge test and other methods.We investigated by changing the volume ratio of MF and PVA solution andcarbonization time affect the heteroatom-enriched carbon fiber performance andcompared with the heteroatom-enriched carbon powder. Results show that: theheteroatom-enriched carbon fiber possesses network structure in which fibers areconnected each other and the average diameter of heteroatom-enriched carbon fibers isabout200nm~500nm. The heteroatom-enriched carbon fiber is self supporting structureand flexible. NCF has high specific capacitance value than NCP. The highest specificcapacitance of the electrode material is147.7F/g, prepared by volume ratio of MF andPVA solution of3:1, the electrospinning distance of25cm, the flow rate of0.4mL/h,voltage of20kV,750℃carbonization1h，measured at the scanning rate of0.001V/sby cyclic voltammetry. With the increase of the MF content in the electorsHpinningHsHolution,H the nitrogen and oxygen content of heteroatom-enriched carbon fiber increases.With the increase of the carbonization time，the nitrogen content of heteroatom-enrichedcarbon fiber decreases from4.68at.%to3.60at.%. The supercapacitor was assembled bythe NCF exhibit good electrochemical properties than the NCP.The effects of the single and composite pore forming agent on the NCF electrode materials and supercapacitor were investigated. The effects of the electrochemicalperformance of supercapacitor about assembly process and the positive and negativemass ratio were investigated. Results show that: the single pore forming agentpolyethylene glycol has better effect about manufacture pores than ammonium chloride.The electrode material has the best electrochemical performance, the highest specificcapacitance is71.5F/g, prepared by the PNCF with15wt.%polyethylene glycol as thecathode and it is using electrodeposition of nickel hydroxide as the anode, the positiveand negative mass ratio was1:2, assembled winding supercapacitor, measured at thecurrent of100mA by the galvanostatic charge/discharge test. The retention ratio ofspecific capacitance and specific energy is92%after10000cycles. With the increase ofpore formers content, the nitrogen and oxygen content of heteroatom-enriched carbonfiber increase, the total specific surface area and pore volume increased of electrodematerial. It is in favor of improving the specific capacitance of electrode material. ThePNCF with5%NH4Cl and15%PEG composite has the better specific capacitance thanthe PNCF with15%PEG. The specific capacitance is231.6F/g, measured at thescanning rate of0.001V/s by cyclic voltammetry. Its windingsHupercapacitorHcouldachieve the specific capacitance of123.1F/g at the current of50mA. The porousheteroatom-enriched carbon fiber paper is a kind of good electrode material.