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An indium-tin oxide (ITO) coated spinel manganese oxide (, LMO) is prepared and its high-temperature () cycle performance and rate capability are examined. A severe electrolyte decomposition and film deposition is observed on the un-coated cathode, which leads to a significant electrode polarization and capacity fading. Such an electrode polarization is, however, greatly reduced for the ITO-coated (> 2 mol%) LMO cathode, which leads to an improved cycle performance. This can be rationalized by a suppression of electrolyte decomposition, which is in turn indebted to a decrease in the direct contact area between LMO and electrolyte. The suppression of film deposition on the ITO-coated LMO cathode is confirmed by infra-red spectroscopy. The rate capability is also improved by the surface coating, which may be resulted from a suppression of resistive film deposition and high electric conductivity of ITO itself.

Improvement of High-Temperature Performance of LiMn2O4Cathode by Surface Coating

Improvement of High-Temperature Performance of LiMn₂O₄Cathode by Surface Coating