【报  告  人】 Dr. YAO, Haimin  Associate Professor
 Hong Kong Polytechnic University
【时        间】 2018年5月30日（星期三）上午9：30-10：30
【地        点】 力一楼239会议室

Abstract: Among all candidates of anode materials for lithium-ion battery (LIB), silicon(Si) stands out for its high capacity and is deemed as the most promising anode materials for the next generation LIBs. But a major obstacle of using Si-based materials as LIB electrode material is the huge (400%) volume change of Si during the charge/discharge processes. As a consequence, fracture and delamination of active electrode materials from current collector occur, resulting in loss of electric conductivity and capacity fading. To overcome this problem, we creatively proposed two solutions. One is to apply current collector with nonuniform (gradient) thickness, while the other is to apply electrode material with gradient Si content. In this talk, I will first theoretically demonstrate the feasibility of these two methods and then report the progress of our experimental verification.

Biography: Dr. YAO, Haimin received his BEng and MEng degrees in Solid Mechanics from Tsinghua University in 2000 and 2002, respectively. He then went to Germany and studied at the Max-Planck Institute for Metals Research. In 2006, he obtained his Doctor degree in Chemistry from University of Stuttgart. Then he moved to USA and worked at Brown University (2006-2007) and subsequently at Massachusetts Institute of Technology (2007-2010) as a postdoctoral research associate. Before joining the Department of Mechanical Engineering of the Hong Kong Polytechnic University in 2011, he had worked at SYSU for around one year.
Dr. Yao leads a research group studying natural biomaterials and advanced materials with focus on their unique mechanical behaviors and the intrinsic mechanisms. Meanwhile, he serves as the program leader for the Full-time BEng (Hons) Program in Mechanical Engineering at the HKPolyU, and editorial board members for the peer-refereed journals of Scientific Reports, Composites Communication and Applied Mathematics and Mechanics.