Abstract
In order to address the role of aluminum dopant in spinel-structured lithium manganese oxide (Li1.08Mn1.84Al0.08O3.96, Al-doped LMO) electrode, high-temperature (60°C) charge/discharge cycling and storage experiments are carried out. The Al-doped LMO outperforms the un-doped counterpart with respect to capacity fading and Mn dissolution. However, the electrode polarization becomes substantial for the Al-doped LMO after the high-temperature storage. As the resistive component to be responsible for the electrode polarization, Al2O3 and Al(OH)xF3-x are identified on the Al-doped LMO surface from X-ray photoelectron spectroscopy study. It is very likely that the doped Al ions dissolve into the electrolyte during the high-temperature storage but re-deposit as a form of Al2O3 and Al(OH)xF3-x on the LMO surface. Due to a scavenging action of these Al species for hydrogen fluoride, Mn dissolution is suppressed to give an improved cycle and storage performance at elevated temperature.
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