第九十九期瓯江学术论坛预告-佐治亚理工学院 林志群教授

报告人：佐治亚理工学院 林志群教授

邀请人：王舜

报告题目：Control Over Dimensions and Compositions of Nanocrystals for Batteries

报告时间：2018年06月27日（星期三） 下午3：30

报告地点：化材楼11B-204

Biography: Dr. Zhiqun Lin is currently Professor of Materials Science and Engineering at the Georgia Institute of Technology. He received the B.S. degree in Materials Chemistry from Xiamen University, Fujian, China in 1995, the Master degree in Macromolecular Science from Fudan University, Shanghai, China in 1998, and the PhD degree in Polymer Science and Engineering from University of Massachusetts at Amherst in 2002. He did his postdoctoral research at University of Illinois at Urbana-Champaign. He joined the Department of Materials Science and Engineering at the Iowa State University as an Assistant Professor in 2004 and was promoted to Associate Professor in 2010. He moved to Georgia Institute of Technology in 2011, and become a Professor in 2014. His research interests include polymer-based nanocomposites, block copolymers, polymer blends, conjugated polymers, quantum dots (rods, tetrapods and wires), functional nanocrystals (metallic, magnetic, semiconducting, ferroelectric, multiferroic, upconversion and thermoelectric) of different architectures (plain, core/shell, hollow and Janus), solar cells (perovskite solar cells, organic-inorganic hybrid solar cells and dye sensitized solar cells), lithium ion batteries, hydrogen generation, hierarchically structured and assembled materials, and surface and interfacial properties. He has published more than 230 peer reviewed journal articles (with an h-index of 65), 13 book chapters, and 5 books. Currently, he serves as an Associate Editor for Journal of Materials Chemistry A, and an editorial advisory board member for Nanoscale. He is a recipient of Frank J. Padden Jr. Award in Polymer Physics from American Physical Society, an NSF Career Award, a 3 M Non-Tenured Faculty Award, and an invited participant at the National Academy of Engineering’s 2010 US Frontiers of Engineering Symposium. He became a Fellow of Royal Society of Chemistry in 2014 and a Japan Society for Promotion of Science (JSPS) Fellow in 2015. More information on his research can be found at http://nanofm.mse.gatech.edu/.  

Control Over Dimensions and Compositions of Nanocrystals for Batteries

Prof. Zhiqun Lin

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Email: Zhiqun.lin@mse.gatech.edu

   Batteries play critical roles in the exploitation of green energy resources and the development of portable electronic devices. As electrode materials, nanocrystals exhibit a wide range of advantages such as large specific surface area, short ion/electron transfer distance and high electrochemical reaction activity. However, high surface energies of nanocrystals lead to easy aggregation of nanocrystals in both synthesis and battery running processes, thus giving rise to great synthetic challenge and quick capacity fading. Breakthrough strategies that facilitate the synthesis of an exciting variety of electrode nanomaterials with rationally designed composition, controlled morphology and stable structure in a convenient manner are of key importance in revolutionarily advancing the application of nanocrystals for energy storage devices. In this talk, I will discuss a general and robust strategy for crafting a rich variety of nanocrystals (i.e., SnO₂ and MFe₂O₄ (M = Zn, Mn, Co or Ni)) as advanced electrode materials with precisely controlled dimensions by employing a set of judiciously designed unimolecular star-like and bottlebrush-like block copolymers as nanoreactors. The uniform carbon (or polymer layer) coating and homogenous GO matrix (or carbon fiber) encapsulation are found to be effective and able to improve the structural stability and electronic conductivity of nanocrystals for achieving superior cycling stability and rate performance. The mechanisms of the property improvement of these functionalized nanocrystals in batteries will also be discussed.