Polyacrylonitrile-based activated carbon fiber (PAN-ACF)/SnO2 composites were synthesized by sol-gel and in-situ chemical synthesis method, respectively, and characterized by XRD, TGA, and SEM. The electrochemical properties of the resultant composites as negative electrodes in lithium-ion battery were also studied to investage the influence of different synthetic methods on the structure and electrochemical properties of the composites. The results show that the SnO2 in the composites prepared by both methods has a tetragonal rutile structure but the structure and electrochemical properties are different. With the similar composition, the composites prepared by in-situ method have uniform distribution of SnO2 particles, and exhibit better cyclic performance than those made by sol-gel method. The capacity of PAN-ACF/SnO2 composites with SnO2 content of 42.9% prepared by in-situ method remains 401.2 mAh g-1 after 50 charge/discharge cycles at a current density of 50 mAh g-1.
This paper has developed one way to produce flexible carbon cloth from artificial cotton cloth carbonized at 1000°C with using (NH4)2HPO4as impregnation agent and phenolic resin as modification agent. The effects of (NH4)2HPO4and phenolic resin on bulk resistivity, tensile strength, density, thickness and microstructure of the resultant carbon cloth were investigated. The results show that (NH4)2HPO4impregnation is helpful to increase the carbon yield of artificial cotton cloth and decrease the bulk resistivity. The fibers in the carbon cloth are bond by carbonized phenolic resin, leading to higher tensile strength and lower bulk resistivity. When mass content of (NH4)2HPO4was 5% and phenolic resin 54%, flexible and porous carbon cloth was prepared with thickness of 0.27mm, density of 0.34g/cm3, bulk resistivity of 0.06Ω·cm and tensile strength of 2.33MPa, which is promising materials for diffusion layer in fuel cell.
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