Professor Pan Feng’s team from Peking University: Regarding the research and development progress of solid-state lithium battery interface engineering, lithium-ion batteries are currently widely researched and used as a clean energy source and are widely used in cutting-edge technologies such as daily electronic products, artificial intelligence, electric vehicles, and drones. field. However, with the rapid development of lithium-ion batteries, their safety performance has become more and more of a concern. Traditional lithium-ion batteries use

　　As a clean energy source that is currently widely researched and applied, lithium-ion batteries are widely used in cutting-edge scientific and technological fields such as daily electronic products, artificial intelligence, electric vehicles, and drones. However, with the rapid development of lithium-ion batteries, their safety performance has become more and more of a concern.

　　Traditional lithium-ion batteries all use liquid electrolytes, and the properties of the liquid electrolyte itself directly affect its safety performance. Solid-state lithium batteries can solve some safety problems. However, due to the low conductivity between solid particles, the conductivity in solid-state batteries has been unsatisfactory until the research report on solid-state electrolytes (MOF-IL) using MOF as the framework host and lithium ion liquid as the ion transport guest, giving solid-state Batteries open up new research perspectives. Recently, Professor Pan Feng's team from the School of New Materials, Peking University Shenzhen Graduate School, based on this perspective, has further improved the safety performance and ion transport performance of this type of solid electrolyte. The research results were recently published in Chemical Communications, titled "Enhanced lithium dendrite suppressing capability enabled by a solid-like electrolyte with different-sized nanoparticles" (Chem. Commun., 2018, 54, 13060-13063; natureindex journal DOI: 10.1039/c8cc07476c ) and was recommended as a cover article highlight.

　　Chem. Comm. magazine cover

　　The team studied the effect of particle size on the performance of MOF-IL ion conductors in metallic lithium batteries. The researchers combined two ion conductors with different particle sizes. Compared with single-component ion conductors, the mixed size can effectively reduce the gaps between electrolyte particles and increase the contact points between electrolyte particles and the surface of electrolyte and lithium metal. The lithium deposition is made more uniform, thereby improving the ability to hinder the growth of lithium dendrites. And due to the increase in conductive ion channels, the conductivity of the electrolyte is also improved to a certain extent. Batteries assembled from this type of solid electrolyte and commercial cathode materials LiFePO4, LiCoO2 and anode material lithium metal also show considerable rate performance and cycle performance. The initial capacity of the LiCoO2|electrolyte|Li battery is 129 mAhg-1, and after 100 cycles It has a retention rate of 94.6%; the LiFePO4|electrolyte|Li battery has an initial capacity of 137 mAhg-1 and has a retention rate of 94.8% after 100 cycles.

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