With the continuous development of lithium-ion battery technology, the pursuit of energy density is getting higher and higher. In the latest national guidelines for new energy vehicles, it is proposed that by 2020, the specific energy of a single power battery should reach 300Wh/ kg, it is very difficult to achieve this indicator on the existing lithium-ion battery system. At the just-held 3rd New Battery Positive and Negative Material Technology Estimation Forum, researcher Liu Jun from the Pacific Northwest Natio