Research progress of all-solid-state battery -Lithium - Ion Battery Equipment

Research progress of all-solid-state battery materials -Lithium - Ion Battery Equipment

The next-generation lithium batteries for electric vehicles and mobile phones will choose all-solid-state lithium-ion batteries with higher energy density and better safety. In order to accelerate the research and development of new materials and all-solid-state lithium-ion batteries, the country has set up a national key research and development plan for "materials genome technology" for the first time during the "Thirteenth Five-Year Plan" period, and hopes to achieve high-throughput computing, synthesis, detection and database (big data) of material genomes. The new concepts and new technologies of machine learning and intelligent analysis) accelerate the research and development of all-solid-state lithium-ion batteries, and set up a national key project of "all-solid-state battery research and development based on material genome technology", which is organized by the School of New Materials, Peking University Shenzhen Graduate School. Professor Pan Feng, as the chief scientist, led 11 units to jointly undertake the work.(Lithium - Ion Battery Equipment)

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.



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