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Organic, solvent-free polyamic acid sizing was coated onto T300 grade carbon fibers (3k) to prepare a polyimide (PI) coating having a high thermal stability and oxidative resistance. The surface of PI-coated carbon fibers was characterized by FTIR and SEM. The mechanical strength of the carbon fibers, thermal stability and oxidative resistance of the coating were also investigated. Results indicate...
Here we report a fully foldable lithium-ion battery (LIB) with high energy density using Li4Ti5O12 (LTO) as the anode and LiCoO2 (LCO) as the cathode with free standing carbon nanotube (CNT) Macro-Films (CMF) as the current collectors. The CMFs were produced using a scalable Floating Catalyst Chemical Vapor Deposition method. The highly flexible CMFs could be folded multiple times without plastic...
A palygorskite/carbon composite was prepared through hydrothermal treatment of palygorskite and cellulose, and its adsorption behavior for methylene blue (MB) was investigated. The effect of adsorption conditions on the capacity and kinetics was also investigated. The adsorption kinetics of MB onto the composite is best described by a pseudo-second-order equation. The adsorption isotherms conform...
A carbon nanotube (CNT) film was used as the current collector and LiCoO2 as the cathode for a lithium ion battery. The battery showed a high initial discharge capacity of 132.8mAhg−1, a high retention rate of over 80% after 500 cycles under 1C and a low self-discharge rate of 1.5%. When the areal density of the CNT film is 16mgcm−2, the energy density of the LiCoO2–CNT battery is 25% larger than...
Polyacrylonitrile-based carbon fiber bundles, with two sides fixed, were heated in a graphitization furnace with temperature profiles similar to those used in the preparation of carbon/carbon composites. The microstructure of the microvoids formed was characterized by small-angle X-ray scattering and high resolution transmission electron microscopy (HR-TEM). Results showed that the average radius...
Graphene oxide (GO) was employed as the sizing agent for continuous carbon fiber (CF) tows by an electrophoretic deposition and subsequent thermal annealing. The GO sheets were tightly coated and covalently attached to CF surfaces. Such reduced GO-deposited CFs exhibit a significant increase in surface roughness as compared to the bare CFs, which leads to an improvement in the interfacial shear strength...
A novel electrochemical grafting of carbon nanotubes (CNTs) on the surfaces of carbon fibers using water as dispersive medium was achieved by the electrolysis of carboxylic acid-functionalized CNTs. The resulting CNT-hybridized carbon fibers showed a selective distribution of CNTs at active carbon sites on the fibers associated with the edge graphite layers and defects, without destroying the crystalline...
A new approach for the growth of carbon nanotubes (CNTs) is reported. In particular, the growth is mediated by adding methanol into n-hexane with dissolved ferrocene. The first mediating effect is that the thermal decomposition of n-hexane and consequent widespread formation of carbon particles can be suppressed. Thus, truly continuous production of CNTs can be realized at high temperature. The second...
High density, well-aligned carbon nanotubes (CNTs) were prepared by thermally decomposing acetylene at 700°C with the help of Ni–Cr alloy as catalyst in a thermal chemical vapor deposition system. The density and alignment of CNTs were characterized by scanning electron microscope (SEM). It was found that the density of the CNTs could be remarkably increased and the alignment could be improved with...
Through measurement of the intensity of the EPR signal of carbon anodes at different discharge and charge potentials, a micropore mechanism is suggested for the storage of lithium in low temperature carbons (LTCs), and it is further confirmed by results from the addition of pore-genic agent and introduction of crosslinker DVB into addition polymers PAN and P(4-VP). The size of micropores acting effectively...
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