Fortschritte bei der Erforschung von Festkörperbatteriematerialien - Lithium-Ionen-Batterieausrüstung
An important part of the research and development of this project includes the research and development of high-performance all-solid-state lithium batteries and key materials (such as new solid-state electrolytes, etc.) and mechanisms (such as interface regulation of solid-state battery materials, etc.). Traditional inorganic ceramic electrolytes have disadvantages such as large interface impedance and poor matching with electrode materials, and are currently difficult to be applied on a large scale in the field of solid-state batteries. Upgrading is very important.
Prof. Feng Pan's group has recently made important progress in the research of novel solid-state electrolytes and high-energy-density solid-state batteries. Lithium-containing ionic liquids ([EMI0.8Li0.2][TFSI]) are loaded as guest molecules into porous metal- A novel composite solid-state electrolyte material was prepared in the organic framework material (MOF) nanoparticle carrier.
Among them, lithium-containing ionic liquids are responsible for lithium ion conduction, while porous metal-organic framework materials provide solid-state carriers and ion transport channels, avoiding the risk of liquid leakage in traditional liquid lithium-ion batteries, and at the same time, it has certain effects on lithium dendrites. The inhibitory effect allows metal lithium to be directly used as a solid-state battery negative electrode. The new solid electrolyte material not only has high bulk ionic conductivity (0.3 mS cm-1), but also has excellent interfacial lithium ion transport performance due to its unique micro-interface wetting effect (nano-wetted effect). The electrode material particles have good matching.
Due to the above characteristics, the solid-state battery assembled with the new solid-state electrolyte, lithium iron phosphate positive electrode and lithium metal negative electrode can achieve extremely high electrode material loading (25 mg cm-2), and perform in the temperature range of -20-100 °C. good electrochemical performance.