To accelerate the research and development of new materials and all-solid-state lithium-ion batteries, the state established the "Materials Genome Technology" National Key Research and Development Program for the first time during the 13th Five-Year Plan period. It aims to accelerate the research and development of all-solid-state lithium-ion batteries through new concepts and technologies such as high-throughput computing, synthesis, detection, and databases (machine learning and intelligent analysis of big data) of materials genome. The National Key Project "Research and Development of All-Solid-State Batteries Based on Materials Genome Technology" was established, which is led by Professor Pan Feng of the School of New Materials at Peking University Shenzhen Graduate School as the chief scientist and jointly undertaken by 11 institutions.
A key part of this project's research and development includes the development of high-performance all-solid-state lithium batteries and key materials (such as novel solid-state electrolytes) and mechanisms (such as the regulation of interfaces in solid-state battery materials). Traditional inorganic ceramic electrolytes have drawbacks such as high interfacial impedance and poor compatibility with electrode materials, making them difficult to apply on a large scale in the field of solid-state batteries. Therefore, developing novel solid-state electrolytes with lower interfacial impedance is of great significance for improving the energy density and electrochemical performance of solid-state batteries.
Professor Pan Feng's research group has recently made significant progress in the research of novel solid electrolytes and high-energy-density solid batteries. They have prepared a novel composite solid electrolyte material by loading lithium-containing ionic liquid ([EMI0.8Li0.2][TFSI]) as a guest molecule into a porous metal-organic framework (MOF) nanoparticle carrier.
In this process, lithium-containing ionic liquids are responsible for lithium-ion conduction, while porous metal-organic framework materials provide a solid-state carrier and ion transport channels, avoiding the leakage risk of traditional liquid lithium-ion batteries. They also have a certain inhibitory effect on lithium dendrite formation, allowing metallic lithium to be directly used as the anode in solid-state batteries. This novel solid-state electrolyte material not only possesses high bulk ionic conductivity (0.3 mS·cm⁻¹), but also exhibits excellent interfacial lithium-ion transport performance due to its unique nano-wetting effect, resulting in good compatibility with electrode material particles.
Due to the above characteristics, the solid-state battery assembled with the novel solid electrolyte, lithium iron phosphate cathode and lithium metal anode can achieve an extremely high electrode material loading (25 mg·cm⁻²) and exhibits good electrochemical performance in the temperature range of -20 to 100 °C.
