Electrochemical Impedance Analysis of V2O5 and PEDOT Composite Film Cathodes
- Electrochemical Impedance Analysis of V2O5 and PEDOT Composite Film Cathodes
- H.-M. Song; D.-Y. Yoo; S.-K. Hong; J.-S. Kim; 조원일; 모선일
- composite film cathode; conducting polymer; diffusion coefficient; impedance analysis; nanocrystalline
- Issue Date
- VOL 23, NO 9, 2094-2102
- Composite films of nanobeam V2O5 and poly-3,4-ethylenedioxythiophene (PEDOT) were grown using an electrochemical
polymerization method. PEDOT in the composite film connects the isolated V2O5 nanobeams and gives
rise to a conductive network, improved Li-ion accessibility and transport pathways in the electrode. The nanobeam-
V2O5/PEDOT composite film cathodes have high capacities, excellent rate capabilities and cycling stabilities at various
C rates: their specific capacities were 262 mAhg-1 at 0.1 C, 239 mAhg-1 at 1 C, 186 mAhg-1 at 10 C, and
141 mAhg-1 at 100 C. After testing the battery for more than 150 battery cycles at a rate of 10 C, the degradation
rate was found to be approximately 9%. The diffusion coefficient of the nanobeam-V2O5 crystalline electrode was
calculated to be approximately 4.6X10-8 ; and those of α-, ε-, and δ-LixV2O5 crystalline phases, were estimated to be
in the range of (2.1–9.8)X10-10. Under the conditions of PEDOT coating and networking in the composite film, the
diffusion coefficients of each phase of LixV2O5 that reversibly formed during the discharging and charging processes
were able to be estimated.
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