Abstract: With the development of consumer electronic products and clean-energy vehicles, lithium-ion battery has been paid more and more attention by each and every country. As the key component of the lithium-ion battery, electrolyte of which the selection for different materials and various electrochemical performance, has an important effect on the electrochemical performance, safety performance and life span of the battery. In order to review the development and distribution of electrolyte for lithium-ion battery, patents from domestic and overseas on the electrolyte for lithium-ion battery filed are analyzed, based on the searching results from the Derwent Word Patent Index databass(DWPI) and China Patent Abstract Database(CNABS). Based on this results, this report focuses on the analysis of the aspects of patents application trend, distribution of the main technical fields for various countries or districts and major applicants in worldwide and China. The results show that Japan has an absolute advantage in the field of electrolyte for lithium-ion batteries, followed by Korea and China. China has being closed to the developed countries on the number of patents, however，it lacks of the foundation and core patents pack. In the various technical fields, electrolyte salt, organic solvent and additive have formed the inherent pattern, the development of new products and the mixture collocation becomes a breakthrough way. For the domestic important applicants, the decentralization of industry and lack of a number of leading enterprises are observed. At the same time, the industrial-academic-research cooperation may become another opportunity for development with the coexistence of enterprises and universities. Some suggestions are put forward on the development and distribution of patents of electrolyte for lithium-ion battery for our country in the future.

Key words: lithium-ion battery, electrolyte, patent analysis