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Sputtering graphite coating to improve the elevated-temperature cycling ability of the LiMnO electrode

Physical Chemistry Chemical Physics, ISSN: 1463-9076, Vol: 16, Issue: 30, Page: 16021-16029
2014
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Article Description

To improve the cycle performance of LiMnO at elevated temperature, a graphite layer is introduced to directly cover the surface of a commercial LiMnO-based electrode via room-temperature DC magnetron sputtering. The as-modified cathodes display improved capacity retention as compared to the bare LiMnO cathode (BLMO) at 55 °C. When sputtering graphite for 30 min, the sample shows the best cycling performance at 55 °C, maintaining 96.2% capacity retention after 200 cycles. Reasons with respect to the graphite layer for improving the elevated-temperature performance of LiMnO are systematically investigated via the methods of cyclic voltammetry, electrochemical impedance spectroscopy, X-ray photoelectron spectrometry, scanning and transmission electron microscopy, X-ray diffraction and inductively coupled plasma-atomic emission spectrometry. The results demonstrate that the graphite coated LiMnO cathode has much less increased electrode polarization and electrochemical impedance than BLMO during the elevated-temperature cycling process. Furthermore, the graphite layer is able to alleviate the severe dissolution of manganese ions into the electrolyte and mitigate the morphological and structural degradation of LiMnO during cycling. A model for the electrochemical kinetics process is also suggested for explaining the roles of the graphite layer in suppressing the Mn dissolution. This journal is © the Partner Organisations 2014.

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