Solution-combustion synthesized Al-Mo co-substituted cathode Li[Li0.2Ni0.13Co0.13Mn0.54]O-2 for improving electrochemical performance of lithium ion batteries

Li[Li0.2Ni0.13-x+y/3Co0.13-x+y/3Mn0.54-x+y/3]Al (x) Mo (y) O-2 was synthesized via conventional solution combustion synthesis method. Microstructural characterizations were done by X-ray diffraction analysis and scanning electron microscopy, whereas electrochemical performance was evaluated by electrochemical tests. The electrochemical results indicated that Mo-Al doping has significant effect on capacity and cycling performance. The sample doped with Al (x = 0.015) and Mo (y = 0.015) exhibited higher cycling stability and higher capacity in comparison with those of non-substituted material. The initial discharge capacity for Mo-Al co-doped electrode was 265.5 mA h g(-1) at 25 mA g(-1), and capacity retention after 50 cycles was 98.2%, whilst the initial discharge capacity for bare electrode was 239.1 mA h g(-1) at 25 mA g(-1), and capacity retention after 50 cycles was 93%. Electrochemical impedance spectroscopy and cyclic voltammetry revealed that by the addition of Mo-Al, electrochemical performance of the Li[Li0.2Ni0.13Co0.13Mn0.54]O-2 is improved.