Suppression of O2evolution from oxide cathode for lithium-ion batteries: VOx-impregnated 0.5Li2MnO3–0.5LiNi0.4Co0.2Mn0.4O2cathodeElectronic supplementary information (ESI) available: Experimental, XRD, Electrochemical data, EDS with SEM/TEM, FT-IR, C 1s XPS spectra. See DOI: 10.1039/c0cc00281j

A VOx-impregnated oxide cathode for lithium ion batteries exhibits a substantial drop in oxygen evolution during high voltage operation. An electrolyte was found to catalyze the gas evolution, and the VOxlayer could protect the cathode oxide surface from the electrolyte and stabilize the surface oxide ions during their electrochemical oxidation. [ABSTRACT FROM AUTHOR]