| 报告题目： | |
| 报告人： | 姜汉卿 美国亚利桑那州立大学副教授、暨南大学讲座教授 |
| 主持人： | 黄世清 副教授 |
| 报告时间： | 2016年1月5日（周二）上午10:30 |
| 报告地点： | 蒙民伟理工楼516学术报告厅 |
ABSTRAT: Silicon is an attractive anode material being closely scrutinized for use in Li-ion batteries because of its highest-known theoretical charge capacity of 4,200 mAh/g. However, the development of Si-anode Li-ion batteries has lagged behind because of their large mechanical deformation, i.e., up to 400% volumetric change during electrochemical reactions, which results in fracture, pulverization and early capacity fading. Therefore, a fundamental understanding of the coupled behavior of mechanics and electrochemistry will not only advance our knowledge on the failure of Si under lithiation, but also provide a basis to resolve this bottleneck in the development of the promising Si-anode Li-ion batteries. In this presentation, we will report a systematic study by direct measurement of Li-Si composition using Auger Electron Spectroscopy (AES), micro-nano scale observation of Si expansion using Focus Ion Beam (FIB), and ex-situ measurement of young’s modulus and hardness by nanoindentation during a-Si film lithiation.
Another part of this presentation is about stretchable lithium ion batteries. We have produced stretchable lithium-ion batteries (LIBs) using the concept of kirigami, i.e., a combination of folding and cutting. The designated kirigami patterns have been discovered and implemented to achieve great stretchability (over 150%) to LIBs. It is expected that the kirigami LIBs are able to resolve one of the bottlenecks in the development of wearable devices by providing a scalable solution for a stretchable energy source to profoundly change the form factor.
简介：姜汉卿，2001年毕业于清华大学工程力学系，获博士学位，现为美国亚利桑那州立大学副教授、暨南大学讲座教授。长期从事软/硬非均质材料的物理力学性能及其应用等方面的研究工作，在纳米材料、柔性电子、超级电容器、高性能锂离子薄膜电池等领域取得了出色的科研成果。先后主持了包括美国自然科学基金在内的科研项目14项；已在Science、PNAS、Nature Communications、Nature Nanotechnology、Scientific Reports和Adv. Energy Mater等著名期刊上发表学术论文100余篇，其中SCI收录102篇，SCI引用超过3700次，H-index达到31。并获批/申报美国发明专利11项。姜汉卿副教授由于在纳米碳管薄膜领域的突出成果，获得2009年美国国家科学基金职业成就奖（NSF CAREER award）。2014年，亚利桑那州立大学授予姜汉卿副教授教师成就奖（Faculty Achievement Awards）中的最佳创新奖（Best Innovation）。