Abstract: The present invention is to provide a non-aqueous electrolyte secondary cell and/or battery, which use a brannerite type lithium vanadium molybdenum oxide, LiVMoO5.5. The material synthesized following a simple aqueous solution reaction (ASR) process exhibits both submicronic and nanophase particles having low porosity, demonstrates the high voltage behavior in lithium-containing cells and battery. The present invention also provides a method for producing the above mentioned cathode-active material in bulk quantity by means of ASR process, called sol-gel, xerogel, co-precipitation, hydrothermal, glycine-nitrate soft-combustion process, precursor complexation process (all kinds of carboxylic acid as complexation agents as well as alkoxides). In particular, the method comprises preparing a lithium vanadium molybdenum oxide with brannerite structure (layered) and having molecular formula LiVMoO5.5.