Preparation Of Carbon Nanotube Fiber Function And Its Application In Supercapacitors

In this thesis, single-walled carbon nanotubes (SWNTs) and conducting polyaniline (PANI) nanowires or bio-mass composite fibers were prepared by using wet-spinning methods. The SWNTs composite fibers with high physical and chemical properties can be obtained after washing in water bath and annealing. Based on these composite fiber electrodes, all-solid-state composite fiber supercapacitors and all-solid-state all-carbon composite fiber supercapacitors were designed. The as-prepared supercapacitors show good capacitive performance:high capacitance, superior rate capability, and cyclic stability.Section I:PANI nanowires and SWNTs composite fiber supercapacitors:PANI nanowires with high electronic conductivities were synthesized and regulated by using solution polymerization. After dialysis, the PANI dispersion was mixed with SWNTs dispersion. Using this composite spinning dispersion, the composite fibers were synthesized by using wet-spinning methods. Composite fibers with good physical and chemical properties can be obtained after washing in de-ionized water and drying in air. The composite fiber supercapacitors were assembled using PANI and SWNTs fiber electrode. The electrochemical properties, mechanical properties, and structures of the electrode materials were studied.Section II:All-carbon SWNTs composite fiber supercapacitorsThe chitosan (CHI) and SWNTs composite fibers were synthesized using wet-spinning methods with the coagulating bath of CHI solutions. All-carbon SWNTs composite fibers obtained after thermal annealing. And then the fiber supercapacitors were assembled. The structure of electrodes and the electrochemical and mechanical performance of supercapacitors were studied using electrochemical workstation, stress-strain test, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectrometry, et al. These fiber supercapacitors could be used to build wearable energy devices integrated with other wearable electronics with great prospect.