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Nanchang, China

Pang Z.,Nanchang University | Sun X.,Nanchang University | Sun X.,Institute of lithium Energy | Cheng X.,Nanchang University | And 2 more authors.
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2015

Composite sheets of carbon nanotubes-cellulose fibers were made by suction filtration method with cellulose fibers as matrix and graphitized CNTs as electroconductive agent. The products were characterized by scanning electron microscopy, shielding effectiveness, four-point probes, and while the effect of carbon nanotube content on the EMI shielding performance of the prepared composite sheets was investigated. The results show that the shape and conductivity is controllable for the composite sheets, which then exhibits good flexibility, electrical conductivity and EMI shielding effectiveness. CNTs were adsorbed on the cellulose fibers and formed a continuously interconnected conductive network. With the increasing amount of CNTs from 10% to 71%, the conductivity of the composite sheets increased from 9.92 S/m to 216.3S/m and correspondingly their EMI shielding effectiveness increased from 15dB to 45dB in the frequency range 175 MHz-1600 MHz. ©, 2015 All right reserved. Source


Wu X.-Y.,Nanchang University | Sun X.-G.,Nanchang University | Sun X.-G.,Institute of lithium Energy | Nie Y.-Y.,Nanchang University | And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

A new type of carbon nanotube (CNT) paper were prepared by mixing carbon nanotube with paper fiber. The paper fibers were used as the basic framework and the carbon nanotubes as conductive filler. The CNT papers were made by vacuum filtration method. The properties of the conductive paper, which used carbon nanotubes as the conductive fillers, were compared with the graphited carbon nanotubes and the raw graphite carbon nanotubes. The morphology and performance of the CNTs and CNT papers were characterized by the scanning electron microscope (SEM), transmission electron microscope (TEM), four-point probes, XRD diffraction and Raman spectra. The CNT papers were cut into the anode electrodes and assembled into half cells. The electrochemical performance of the batteries were detected by a cell tester (CT-3008W-5V5mA-S4). The results show that the stable discharge specific capacity of the cells reached 266 mAh/g at 0.1 C with graphitized CNTs as filler of the anode electrodes. The specific discharge capacity of batteries increases from 142 mAh/g to 266 mAh/g and achieve a 87.3% improvement. © 2015, Chinese Ceramic Society. All right reserved. Source


Liu Z.-H.,Nanchang University | Sun X.-G.,Nanchang University | Sun X.-G.,Institute of lithium Energy | Wu X.-Y.,Nanchang University | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

A new kind of carbon nanotubes (CNT) paper was used as anode current collector for lithium ion battery. Graphite was used as anode active materials. The prepared battery shows a high first special discharge capacity of 815.7 mAh·g-1 at the rate of 0.2 C, has a reversible special discharge capacity of 474.0 mAh·g-1, which is two times larger than lithium ion battery with copper foil. It can keep a retention rate of 97.2% after 10 cycles. CNT paper has good performance in strength, toughness and adsorption of electrolyte. Compared with copper foil, the characteristics of the paper structure ensures the cathode materials to contact with CNT paper tightly, thus decrease the interface resistance, and increase the electrical conduction channel. The CNT paper is expected to become a new type of cathode current collector for lithium ion battery. ©, 2015, Chinese Ceramic Society. All right reserved. Source


Fu Q.,Nanchang University | Sun X.-G.,Nanchang University | Sun X.-G.,Institute of lithium Energy | Yao J.,Nanchang University | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2014

The influences of multi-walled carbon nanotubes, graphite and superconducting electric acetylene black on the discharge current capacity of modified flexible zinc manganese battery are investigated. The discharge properties of the dopped batteries are tested at different discharge current. The results show that the performance of zinc-manganese batteries are all improved after doping conductive agent. The modification of carbon nanotubes on the battery has best comprehensive performance, which is followed by the acetylene black and graphite. The discharge time and capacity reach 252 hours and 50.4 mAh, respectively, at 0.2 mA constant current discharge. At 0.8 mA and 1 mA constant current discharge, its loss rate of capacity is the least. Doping effect of CNTs is much greater than other conductive additives. Source


Cheng X.-Y.,Nanchang University | Sun X.-G.,Nanchang University | Sun X.-G.,Institute of lithium Energy | Pang Z.-P.,Nanchang University | Fu Q.,Nanchang University
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The acidified and amine-modified carbon nanotubes are dissolved into water through ultrasonic, shear and centrifugation methods. Their dispersibility is compared as well. Subsequently, a carbon nanotube conductive paper is prepared by mixing the dispersion with pulp. Infrared spectrometer, scanning electron microscopy and shielding effectiveness are used to characterize the carbon nanotube conductive paper. The result shows that the carboxyl group or an amide groups can be successfully introduced to the end of carbon nanotubes. The acidified carbon nanotubes have a good dispersion for 25 days. The MWCNTs-COOH conductive paper and MWCNTs-ODA conductive paper have preferable shielding effectiveness. The discharge capacity of Zinc manganese battery can be improved by 50.56% when the carbon nanotubes conductive paper has taken the place of graphite as the cathode current collector. This provides a new idea for improving discharge performance of a battery. ©, 2015, Xiandai Huagong/Modern Chemical Industry. All right reserved. Source

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