Development of LiCr<inf>0.15</inf>Co<inf>0.85</inf>O<inf>2</inf> nanowires by electrospinning method as a cathode for asymmetric supercapacitors

Abstract

LiCrO. 1 5CoO.850Z nanowires were prepared successfully by electrospinning technique at the calcination temperature of 500 ·C for 6 hours. The average diameter of the nanowires was 45 nm. The phase transformation, crystallite structure and morphology of the prepared LiCrO.lSCoO.8S02 nanowires were studied using thermal analysis, X-ray diffraction / FTIR spectroscopy and scanning electron microscope analysis, respectively. The crystalline phase of the sample was identified as a single phase with a-NaFeOz type structure and the peaks were indexed to the hexagonal system assuming the R3 m symmetry.The electrochemical behavior of the prepared LiCrO. 1 5CoO.850Z nanowires based electrode was investigated by cyclic voltammetry and AC-impedance studies. The electrochemical measurements provided a maximum specific capacitance of 77.7 Fg· 1 with a resistivity of 4.50. Finally, the asymmetric supercapacitor cell AC// LiCrO.lSCoO.8S02 was fabricated and its specific discharge capacitance, energy density and power density were determined are found to be 72.3 Fg· 1 , 256.2 Wkg-1 and 183.5 Wh kg-I , respectively. The cell has good cycling stability and retaining 94 % of its initial charge even after 1000 cycles. It revealed that the prepared LiCrO. 1 5CoO.8502 nanowires could be used as an effective electrode material for high performance asymmetric supercapacitors.