时间：2013年6月15日下午16：30-17：30
地点：北京大学深圳研究生院G-206
主办方：新材料学院
Tittle: Materials for energy storages——Li ion rechargeable batteries -From bulk to micrometer and Supercapacitors
报告人: 新加坡大学吕力教授（Li Lu），Materials Science Group, Department of Mechanical Engineering，National University of Singapore, Singapore 117576, e-mail: luli@nus.edu.sg
报告人介绍：
Graduated from Tsinghua University with B.Eng and M.Eng degrees, Dr. Lu joined Katholic Universiteit Leuven, Belgium for his Ph.D study. After fours PhD and two years postdoctoral study, Dr. Lu joined National University of Singapore (NUS) in 1991. He has also been involved in energy storage materials such as Li rechargeable batteries, microbatteries and supercapacitors, and ferroelectric materials.
Dr. Lu is the Editor-in-Chief of Functional Materials Letters, Associate Editor of Materials Technology, specially for functional materials, Editorial Member of Scientific Report. Due to his contributions to functional materials, he has been invited to deliver plenary, keynote and invited lectures by numerous conferences and institutions. He has published 3 books in the area of fabrication of nanostructured materials, fractal and rapid prototyping, and published over 320 papers in international journals including Physical review B, Applied Physics Letters, Journal of Applied Physics, Applied Physics Letters, Journal of Materials Chemistry, Journal of Physical Chemistry, Philosophy magazine, Journal of America Chemistry Society, Journal of Electrochemical Society, Electrochemical Communication Electrochimical Acta etc.
Abstract:
Li-ion rechargeable batteries have become one of most important energy storage system for portable devices as well as for large scale applications such as for electric vehicles (EVs). More recently miniaturization and low power consumption of modern electronic devices such as laboratory-on-chip or system-on-ship, and micro- and nano-devices requires only small power supply units. Therefore all-solid-state thin film microbatteries become important in those applications. We have successfully developed all-solid-state thin film batteries in the thickness of a few micrometers. The structures and electrochemical performance of the thin film electrodes are strongly dependent of processing parameters such as oxygen partial pressure and deposition temperature. In addition the relationship between thin film structure, deposition parameters and electrochemical properties of thin film electrodes, mechanical integrity is also studied in this work. Since charge/discharge is associated with Li ions’ transportation between different electrodes, changes in volume of the electrodes are induced, causing a serious consequences such as change in Li ions’ transportation rate due mainly to mechanical constrain, interfacial failure and even generation of cracks on the film.
Anther type of energy storage devices is supercapacitor which stores energy as charge. Since energy is store in the form of charges, this type of energy storage devices can store as well as release electric energy in an extremely fast fashion. Traditionally carbon has been used. Since there is no faradic reaction, amount of charges stored is relatively limited. Due to development of transition metal oxides and nanostructured materials recently, capacitance of supercapacitors is dramatically enhanced by forming pseudo-supercapacitors. An overview of recent work in Prof. Lu’s group will be presented.
