Improving Electrochemical Performance of Li1.2Ni0.13Co0.13Mn0.54O2 Cathode Material by Al3+ Doping

Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials doped with different Al3+ contents have prepared by high temperature solid state method, which are studied using X-ray diffractometry, X-ray photoelectron spectroscopy, Infrared absorption spectrum, scanning electron microscopy, electron diffraction spectroscopy (EDS), high resolution transmission electron micrograph (HRTEM), charge-discharge measurements and electrochemical impedance spectroscopy. Al doped Li1.2Ni0.13Co0.13Mn0.54O2 with hexagonal crystal system structure and layered structure of alpha-NaFeO2 indicates better crystal stability and more excellent energy storage systems. The Al3+ doped cathode materials can indicate bigger discharged capacities, better cycling stability and rate performance compared with the pristine cathode material according to the results of kinds of characterization technique support each other, it can prove successful a lot of Al3+ doping into Li1.2Ni0.13Co0.13Mn0.54O2 lattice rather than generating new phase structure. This superior electrochemical performance of Li1.2Ni0.13Co0.13Mn0.54O2 cathode material is attributed to the Al3+ doping.