Synthesis and Electrochemical Properties of Spinel Lithium Manganese Cathode Material LiNi0.01Co0.03Mn1.96O4

Ni-Co co-doped LiNi0.01Co0.03Mn1.96O4 (LNCMO) cathode material with a polyhedral morphology was prepared via a solid-state combustion method. Results show that the LNCMO sample has excellent rate performance and long cycling stability, it delivers the initial discharge capacity of 110.6 and 102.3 mA.h/g with capacity retention rate of 75.7% and 78.3% after 1000 cycles at 1C and 5C at 25 degrees C, respectively. At high current rate of 10C and 20C, the capacity retention rates of 78.8% and 54.2% are obtained after 1000 cycles, respectively. Even at 1C under high temperature of 55 degrees C, the capacity retention rate of 76.6% is also maintained after 1000 cycles. The LNCMO sample shows larger Li+ ion diffusion coefficient (4.77x10(-11) cm(2)/s) and lower apparent activation energy (23.37 kJ/mol) compared to the Co-doped sample.