Synthesis, structural and electrical properties of Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2 synthesised by sol-gel method

摘要

In this present study, we have reported the synthesis of Li-rich Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_2 by sol-gel method which is used as cathode material in Li-ion batteries (LIBs). X-ray diffraction confirms the crystallisation of synthesised material in the hexagonal layered structure of space group R-3 m. Fourier transform infrared spectroscopy confirmed the functional groups. Field-emission scanning electron microscopy equipped with X-ray spectrometer attributed to the morphology and elemental composition of the material. Electric and dielectric properties were investigated in the frequency range of 50 Hz-5 MHz for the temperatures ranging from 313 to 773 K. Conduction mechanism of the cathode material in LIBs was investigated for the grain and grain boundaries in the material. Electric properties of the material were investigated in the framework of impedance, electric modulus and conductivity. Nyquist plot showed the non-Debye nature of the material. The important parameters such as Maxwell-Wagner relaxation, hopping mechanism, activation energy, ionic mobility in the material are investigated. The interfacial ion transport mechanism of conductivity is studied using Jonscher's Power Law.