Novel in situ nickel doped 1-D lithium titanate nanofibers (Li(4)Ti(5-x)NixO(12), where x = 0, 0.05 and 0.1) have been successfully synthesized using a facile electrospinning process. Physical characterization reveals that nickel is homogeneously incorporated into the lattice of lithium titanate nanofibers (LTONFs) which significantly improves their properties yielding outstanding electrochemical performance in a lithium ion battery at high power rates and significant reduction in the voltage gap between the oxidation and reduction peaks. A capacity of 190 mA h g (1) has been obtained at 0.2C for the 10% nickel doped nanofibers (Ni-LTONF10), which is higher than the theoretical capacity of pristine lithium titanate (175 mA h g (1)) and they also show superior rate capability resulting in 63 mA h g (1) obtained at 50C, which is 20 times higher than that of un-doped pristine LTONFs and lithium titanate nanoparticles (LTONPs). Finally, a hybrid supercapacitor is fabricated using Ni-LTONF10, showing superior energy density at high power density.