We prepared LiNi0.4Co0.6O2 nanofibers by electrospinning at the calcination temperature of 450 A degrees C for 6 h. The prepared LiNi0.4Co0.6O2 nanofibers was characterized by thermal, X-ray diffraction, and Fourier transform infrared (FTIR) studies. The morphology of LiNi0.4Co0.6O2 nanofibers was characterized by scanning electron microscopy studies. The asymmetric supercapacitor was fabricated using LiNi0.4Co0.6O2 nanofibers as positive electrode and activated carbon (AC) as negative electrode and a porous polypropylene separator in 1 M LiPF6-ethylene carbonate/dimethyl carbonate (LiPF6-EC:DMC) (1:1 v/v) as electrolyte. Cyclic voltammetry studies were then carried out in the potential range of 0 to 3.0 V at different scan rates which exhibited the highest specific capacitance of 72.9 F g(-1). The electrochemical impedance measurements were carried out to find the charge transfer resistance and specific capacitance of the cell, and they were found to be 5.05 Omega and 67.4 F g(-1), respectively. Finally, the charge-discharge studies were carried out at a current density of 1 mA cm(-2) to find out the discharge-specific capacitance, energy density, and power density of the capacitor cell, and they were found to be 70.9 F g(-1), 180.2 Wh kg(-1), and 248.0 W kg(-1), respectively.