Technical problems of next-generation power lithium-ion battery materials

The technical problem of next-generation power lithium-ion battery materials is first to deal with safety issues. Can a 300 watt/kg battery be mounted on a lithium battery? In fact, it depends on safety. In order to resolve safety issues, a full range of operations must be carried out from three aspects: materials, monomers, and systems. Material is the basis, and what material is chosen to be safe; the monomer is the key, good or bad is selected by the monomer; the system ensures that the thermal runaway of the lithium ion monomer will not cause other operations. The first way to solve the battery safety problem is to develop the battery Self-heating protection technology. The simple way is to use the PTC material in the battery to complete the temperature activation. The second idea is to develop all-solid-state batteries. In fact, from the perspective of increasing volumetric energy density, solid-state batteries are also very promising. The important advantage of all solids and liquids is high safety. Another feature is the ability to complete internal series, which is conducive to the energy density of modules and systems. In view of the problems of solid-state batteries, the choice of solid electrolyte is the key to the development of solid-state batteries. The second is high-load electrode planning technology. With the increase of power density in the future, this problem will get better. With the increase in energy density, for example, a single battery is 100 watt-hours per kilogram (currently 300 watt-hours per kilogram), this means that the current per unit weight of the material increases, making it difficult for future high-density batteries to maintain electricity. In order to ensure high energy density and power performance, an electrode with gradient pore dispersion is required. Using nano-silicon-carbon composite cathode materials with a capacity of about 500ma-h/g, high-capacity nickel-based oxide or lithium manganese-based anode materials, the energy density of lithium batteries is expected to reach 300-350 Wh/kg. However, in order to achieve an energy density above 500 watt-hours/kg, the combustible liquid electrolyte battery system is not energized, so it is necessary to implement a solid battery system as soon as possible. Solid-state lithium batteries are expected to become the first technical approach for the next generation of automotive power lithium-ion batteries. The benefits of all-solid-state lithium batteries are obvious, but there are still some problems. The most important problem is the low ion conductivity of the solid electrolyte material. The second problem is the poor contact and stability of the solid/solid interface. The third problem is the charging of lithium. Based on these problems, especially the solid-state interface contact/stability and rechargeability of lithium metal, the technology of all-solid-state lithium metal batteries is still immature and uncertain. At present, the breakthrough, functional advantages and industrialization prospects of lithium batteries are first of all solid lithium batteries. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to make electric vehicle batteries more durable?