Abstract: LiNi1-x-yCoxMnyO2 cathode material for lithium-ion battery is one of the promising cathode materials due to its larger discharge capability and good cycle performance as compared with a single component layered materials such as lithium cobaltate, lithium nickelate and lithium manganate, especially under the environment of global sustainable development of new energy industry. In order to review the development of nickel cobalt manganese based cathode material(NCM) for lithium-ion battery in the world and China, patents from domestic and overseas on the NCM for lithium-ion battery are analyzed, based on the searching results from the Derwent Word Patent Index database(DWPI) and China Patent Abstract Database(CNABS). This report focuses on the analysis of the aspects of patents application trend, preparation methods and technical effectiveness, important applicants, technology development route and core patent. The results show that patent applications of NCM around the world and China are increasing, but there is no obvious increase in the number of foreign applications in China recently. The development of domestic started late, the basic and core patents are lacking, and the gap between Chinese applications and Japanese/Korean applications is large. The preparation method is mainly co-precipitation and solid-phase reaction, and the modification is mainly focused to improve the electrochemical performance. However, there is no effective breakthrough in terms of safety and cost issues. Based on these, some suggestions are put forward on the patent layout of NCM for lithium-ion battery of our country in the future.

Key words: lithium-ion battery, nickel cobalt manganese based cathode material, patent analysis