Stability of LiNi0.8Co0.15Al0.05O2 structure in air and H2 atmospheres at elevated temperatures

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Department of Mathematical Sciences


LiNi0.8Co0.15Al0.05O2 (LNCA), which is a typical electrode material used in lithium ion batteries, has recently been applied as electrodes for ceramic fuel cells (CFCs). However, the stability of LNCA under CFC operating conditions (i.e., oxidative/reductive atmospheres and elevated temperatures) remains unknown. Herein, we evaluated the structure change of LNCA in air and H2 atmospheres at elevated temperatures. It was found that LNCA exhibited excellent stability in ambient air within a wide temperature range from room temperature to 800 °C. However, the H2 atmosphere caused the decomposition of LNCA into LiOH and NiO/CoO solid solution at 300 °C, followed by complete reduction to Ni/Co alloy at 600 °C. The H2-promoted decomposition is a near second order reaction with activation energy of 223.59 kJ mol−1. These findings indicate that LNCA can be used as a stable cathode and it is a suitable precursor for the in-situ formation of Ni/Co-based anodes for CFCs.

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Journal of Physics and Chemistry of Solids