LiNi0.5Mn1.5O4 synthesized through ammonia-mediated carbonate precipitation

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Abstract

Abstract We synthesized LiNi0.5Mn1.5O4 cathode materials by using ammonia-mediated carbonate precipitation, and we studied how the ammonia concentration during synthesis (0.1-0.5 mol/L) affected the structural, physicochemical, and electrochemical characteristics of the prepared materials. X-ray diffraction and Rietveld refinement reveal that the amount of Li/Ni antisite defects in the LiNi0.5Mn1.5O4 depend much on the ammonia concentration. The LiNi0.5Mn1.5O4 prepared at 0.3 mol/L has the fewest Li/Ni antisite defects. This sample also delivers the best electrochemical performance, retaining a capacity of 133.5 mAh g-1 after 20 cycles at 0.1 C. Electrochemical impedance spectroscopy confirms that the LiNi0.5Mn1.5O4 prepared at 0.3 mol/L has lower charge transfer resistance, correlating with its better ion diffusion kinetics than the other materials.

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APA

Gu, Y. J., Li, Y., Fu, Y., Zang, Q. F., Liu, H. Q., Ding, J. X., … Ni, J. (2015). LiNi0.5Mn1.5O4 synthesized through ammonia-mediated carbonate precipitation. Electrochimica Acta, 176, 1029–1035. https://doi.org/10.1016/j.electacta.2015.07.114

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