报告题目：Mechanical Degradation of Lithium-Ion Battery 

　　报告人: Fuqian Yang 

　　Department of Chemical and Materials Engineering 

　　University of Kentucky, Lexington, KY 40506 

　　时间：2017年6月5日(周一)  10: 00  

　　地点：中国科学院力学研究所主楼344会议室 

　　报告摘要： 

　　Understanding the effects of carbon nanotubes (CNTs) and ultraviolet (UV) irradiation on solvent transport in polymers is of practical importance for the applications of polymer-CNT composites in electronics and photonics. In this talk, I will present our study on the transport behavior of methanol in poly(methyl methacrylate)-multiwalled carbon nanotubes(PMMA-MWCNTs) composites with and without the irradiation of UV light. The anomalous transport has been investigated as a function of the weight percentage of MWCNTs and UV dose in the temperature range of 30-50 °C. The anomalous transport consists of Case I (controlled by concentration gradient) and Case II (controlled by stress relaxation) transport; both the UV irradiation and the addition of MWCNTs in PMMA enhance the transport of methanol. The activation energies for Case I and Case II transport decrease with the increase of UV dose for the PMMA-MWCNT plates with the same weight percentage of MWCNTs. Without the UV irradiation, the activation energy for Case I transport of methanol decreases with the increase of the weight percentage of MWCNTs, and the activation energy for Case II transport increases with the increase of the weight percentage of MWCNTs. 

　　报告人简介： 

　　Dr. Fuqian Yang received his B.S. in Engineering Physics from Tsinghua University, M.S. in Mechanical Engineering and Ph.D. in Materials Science and Engineering from the University of Rochester. He is a full professor in the Department of Chemical and Materials Engineering at the University of Kentucky. Dr. Yang’s research focuses on electrical-chemical-mechanical behavior of advanced materials, including creep behavior of materials, adhesive deformation of materials, electromechanical interaction of materials, whisker growth, and stress-diffusion interaction in lithium-ion batteries.