October 23 from the Ministry of Science and Technology was informed that the national key research and development projects 'new energy vehicles' focus special support of the Peking University project team designed to prepare a high specific volume of self-volume adaptive silicon / carbon anode material for the development of high specific energy Lithium-ion battery, to further improve the electric vehicle mileage has laid the foundation.
The development of high-capacity negative electrode is an important prerequisite for the development of 400Wh / kg lithium-ion battery. The silicon-based negative electrode has 10 times the theoretical specific capacity of the existing graphite anode, which is the focus of the development of the current anode material, but the silicon-based negative electrode involved in the circulation process Which is a kind of egg yolk structure, which is a kind of egg yolk structure, which is a kind of egg yolk structure, which is a kind of egg yolk structure. In this paper, C composite material.As the buffer space is reserved between the active Si core and the carbon shell, the composite material exhibits self-volumetric adaptability and good structure and interfacial stability during the charging and discharging process.The material specific capacity reaches 1300mAh / g , 3C, 500 weeks and 5C, 1000 weeks after the capacity retention rate of up to 90% and 80% of this work for the development of energy density of 400Wh / kg lithium-ion battery laid the foundation.
