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Mixer – NETL, Zhang – NCSU III.D.2 New High-Energy Nanofiber Anode Materials have significant influence on the Re and Rsl values. However, the Rct value decreases from 167 to 90 Ω·cm2 after the introduction of CNTs, indicating that Si/CNT/C composite nanofiber anodes might have better reaction kinetics during electrochemical cycling than Si/C composite nanofiber anodes. of 69.2% (Figure III - 98a). It is seen in Figure III - 98b that at the first cycle, the specific charge and discharge capacities of the Si/CNT/C nanofibers under 300 mA/g are 1,248 and 852 mA/g, respectively, corresponding to a Coulombic efficiency of 68.3%. The results indicate there is the relatively small degradation of capacity with the increase of current density. Here, the capacities were calculated based on the total weight of Si, CNFs and carbon nanofiber matrix. 200 150 100 50 Si/C nanofiber anode Si/CNT/C nanofiber anode 1.5 (a) 1.0 0.5 0 0 0 50 100 150 200 250 300 350 400 Z'/ohm Figure III - 95: Nyquist plots of Si/C and Si/CNT/C composite 1st Cycle 2nd Cycle nanofiber anodes Re 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 Capacity (mAh g‐1) CPE1 CPE2 Rsl Rct 1.5 (b) Figure III - 96: Equivalent circuit of Si/C and Si/CNT/C composite nanofiber anodes Table III - 15: AC impedance analysis results of Si/C and Si/CNT/C nanofiber anodes Re Rsl Rct Electrodes (ohm.cm2) (ohm.cm2) (ohm.cm2) Si/C 9.00 15.29 167.72 Si/CNT/C 8.15 19.47 90.68 Galvanostatic charge-discharge experiments were carried out to evaluate the electrochemical performance of Si/C and Si/CNT/C composite nanofiber anodes. Figure III - 97 shows galvanostatic charge-discharge curves of Si/C nanofiber anodes under current densities of 50 and 300 mA/g. At the first cycle, when the current density is 50 mA/g, the Si/C nanofibers show a specific charge capacity of approximately 1363 mAh/g and discharge capacity of 947 mAh/g, respectively, corresponding to a Coulombic efficiency of 69.4%. When the current density is 300 mA/g, the Si/C nanofibers show a specific charge capacity of 1,123 mAh/g and discharge capacity of 736 mAh/g, respectively, corresponding to a Coulombic efficiency of 65.5%. The galvanostatic charge-discharge curves of Si/CNT/C nanofiber anodes under two different current densities are shown in Figure III - 98. At the first cycle, when the current density is 50 mA/g, the Si/CNT/C nanofibers show a specific charge capacity of 1,410 mAh/g and discharge capacity of 976 mAh/g, respectively, corresponding to a Coulombic efficiency 1st Cycle 2nd Cycle W 1.0 0.5 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 Capacity (mAh g‐1) Figure III - 97: Galvanostatic charge-discharge curves of Si/C nanofiber anodes under different current densities: (a) 50 mA g-1, and (b) 300 mA g-1 1.5 (a) 1.0 0.5 1st Cycle 2nd Cycle 00 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 Capacity (mAh g‐1) Voltage (V) Voltage (V) Voltage (V) Voltage (V) -Z''/ohm FY 2013 Annual Progress Report 105 Energy Storage R&D 1.5 (b) 1.0 0.5 0 Figure III - 98: Galvanostatic charge-discharge curves of Si/CNT/C composite nanofiber anodes under different current densities: (a) 50 mA g-1, and (b) 300 mA g-1 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 Capacity (mAh g‐1) 1st Cycle 2nd CyclePDF Image | Advanced Battery Development
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