Effect of different MnO2 precursors on the electrochemical properties of spinel LiNi0.5Mn1.5O4 cathode active materials for high-voltage lithium ion batteries
By Ma, Ye; Tang, Haoqing; Tang, Zhiyuan; Mao, Wenfeng; Zhang, Xinhe
Published in Materials Science and Engineering: B
2016
Abstract
Abstract LiNi0.5Mn1.5O4 (LNMO) cathode materials with different morphologies are prepared via a facile template method using various MnO2 precursors. The structures, morphologies and electrochemical properties of the as-prepared LiNi0.5Mn1.5O4 samples are tested by various physical and electrochemical methods. The results of characterization show that the spinel {LNMO} cathode materials have good crystal structure and the MnO2 precursors have no effect on the final products. Moreover, the specific morphology of {LNMO} is closely related to that of MnO2 precursor, and further influence the electrochemical performance. In addition, the {LNMO} sample using {NH4HCO3} as precipitant exhibits excellent rate capability and cyclic stability in all as-prepared samples. Cycled at 0.5 and 1 C, the discharge capacities of {LNMO} cathode active particles using {NH4HCO3} as precipitant are 110.6 and 102.2 after 200 charge-discharge cycles, respectively, which are the largest compared with the {LNMO} using (NH4)2S2O8 and {KMnO4} as oxidants.