Effect of the NO3−/CH3COO− ratio on structure and performance of ultrafine LiMn2O4 by solution combustion synthesis

Ultrathin LiMn2O4 was successfully prepared by calcinating at 700 °C following solution combustion synthesis. The effects of NO3−/CH3COO− ratio of starting materials on the structure and electrochemical performance are investigated. XRD results indicate that LiMn2O4 samples prepared with a NO3−/CH3COO− ratio of 3:2 (LMO3) has the smallest nanocrystallite of 36.1 nm. SEM results reflect that LMO3 has the smallest average primary particles of 210 nm. These features ensure LMO3 have the excellent electrochemical performance. It even can deliver a capacity of 95.5 mA h g−1 at charge-discharge rate of 10 C. The charge-discharge voltage profiles, dQ/dV versus voltage curves and EIS test all indicate LMO3 has the best electrochemical performance.