Abstract: The present invention advantageously provides a high-voltage lithium battery cathode material and its general formula for the composition of the high-voltage lithium battery cathode material presented in this invention: LiMn1.5Ni0.5-XMXO4 Of which: 0<X?0.2, M represents one or several elements comprised by copper, zinc, magnesium, aluminum, cadmium, zirconium, and titanium. The present invention relates to a high-voltage lithium battery cathode material, which utilizes the liquid-phase co-precipitation method to dope transition metal elements, so that all elements could be mixed at the atomic level and obtain a relatively uniform product, stabilizing the crystal structure, avoiding the capacity attenuation caused by structure collapse in the material cyclic process; in addition, this invention has also increased the conductivity, improved the capacity of 5 V platform, thereby avoiding the substantial damage to the battery system resulted from the decomposition of the electrolyte.