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Academic report: Prof. Xu Jiangfei and Prof. Liu Kai

  On November 8, 2019, Xu Jiangfei, Assistant Professor from the Department of Chemistry of Tsinghua University and Liu Kai, Assistant Professor from the Department of Chemical Engineering of Tsinghua University were invited to our school for an academic visit invited by Professor Feng Shi and made a wonderful academic report on "Controllable Supramolecular Polymerization and Function" and "'Smart' Lithium Ion Batteries: Energy Density and Safety" respectively.

    "Controllable Supramolecular Polymerization and Function", reported by Professor Xu Jiangfei, describes the unique properties of supramolecular polymers and their applications in smart response materials, and analyzes the uncontrollable structure and function of supramolecular polymerization in preparation. And thus introduced a series of studies on the controllable preparation of supramolecular polymers. The report mainly includes the following three aspects: (1) Transferring supramolecular polymerization from solution to liquid-liquid interface to establish a new method of supramolecular interfacial polymerization and provide a new method for the controllable preparation of supramolecular materials. (2) Pushing the supramolecular polymerization from the thermodynamic equilibrium state away from the equilibrium state to develop a new method of dissipative supramolecular polymerization of optical function, and opening up a new system of supramolecular polymers far from the equilibrium state. (3) By controlling the properties of dyes by controlled assembly, a series of near-infrared supramolecular dyes with excellent photothermal antibacterial and anti-cancer properties were constructed, which provided new materials for photothermal antibacterial and therapeutic.

    In the "smart" lithium-ion battery: energy density and safety report, Professor Liu Kai ,from the view of material, introduced the principle of thermal runaway of lithium-ion batteries: the growth of lithium dendrites. On the basis of principle analysis, the concept and characteristics of intelligent lithium-ion battery will be introduced, and the role of lithium-ion battery safety in solving the problem from the germination stage to the outbreak stage will be discussed, including: (1) development of solid-liquid and sexual stimulation The polymer, which exhibits solid state properties at high shear rates, hardens the protective film, inhibits the dendrite of lithium dendrites, and improves the electrochemical stability of the battery. (2) Inorganic-polymer hybrid lithium metal anode, intercepting and reacting with lithium dendrites, slowing the growth of lithium dendrites in the battery (3) Highly stimulating response of the core-shell fiber structure of PVDF-HEF coated triphenyl phosphate The molecular separator provides a flame retardant effect by releasing the fire retardant during short circuit. (4) Preparation of an inorganic polymer thermal barrier adhesive containing ammonium phosphate. These studies provide a new method for the development of high security batteries.

    After the reports, the teachers and classmates asked questions to the researcher Xu Jiangfei and professor Liu Kai actively. Beside, heated discussed and exchanged on the report were also made on different directions.
 
Professor Profile:
Xu Jiangfei graduated from the Chemistry College of Beijing Normal University with a Bachelor of Science degree in 2009. He graduated from the Institute of Physics and Chemistry of the Chinese Academy of Sciences in 2014 with a Ph.D. degree and is a researcher with Yang Qingzheng. From 2014 to 2016, he worked as a postdoctoral researcher in the Department of Chemistry at Tsinghua University. The coordinator was Professor Zhang Xi. Since July 2016, he has worked in the Department of Chemistry of Tsinghua University as an assistant researcher and associate researcher. The main research direction is supramolecular polymer and functional supramolecular assembly. Received the 2018 China Chemical Society Youth Chemistry Award.
Liu Kai, Assistant Professor of the Department of Chemical Engineering, Tsinghua University, doctoral tutor. His research interests include research on new energy polymer energy storage materials and battery safety materials. 2005-2009 Bachelor of Chemistry, Jilin University, Ph.D., Department of Chemistry, Tsinghua University, 2009-2014 (Instructor: Professor Zhang Xi), Postdoctoral Fellow at Stanford University, 2014-2019 (Cooperative Teacher: Professor Cui Wei). As a first author or correspondent, he has published 16 papers in internationally renowned academic journals (such as Science Advances, JACS, Joule, Angew Chem, Adv Mater, etc.), three of which are ESI Highly Cited Papers. The research results have been featured in Science, Nature Materials, NPG Asia Materials and other academic journals, and have been reported by CNN, BBC and Science Daily. It has been cited more than 2,800 times and the h-index is 31. In 2019, he was selected as the fifteenth batch of the Central Organization Department. He was awarded the Dinitris N. Chorafas Youth Research Award in Switzerland, the Tsinghua University Special Scholarship, and the Tsinghua University Graduate Academic
 Rookie.