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2016年1月12日学术报告:Probing the Ion Migrations at Nanoscale Using Advanced Transmission Electron Microscopy
学 术 报 告
题目:Probing the Ion Migrations at Nanoscale Using Advanced Transmission Electron Microscopy
报告人: 苏东 研究员 (Prof. Dong Su)
Center for Functional Nanomaterials, Brookhaven National Laboratory and Department of Materials Science and Engineering, Stony Brook University, USA Email: dsu@bnl.gov
邀请人:徐庆宇
时间:2016年1月12号上午10点00分
地点:田家炳楼南205
摘要:
Secondary ion batteries, especially, lithium ion battery (LIB), play an important role in our daily life such as portable devices, electric car and station storage devices. For next generation batteries, we would like to improve their energy density, cycling stability, and safety issues which demands us to develop new electrode materials. My research focuses on the study of the reaction mechanism of the conversion compounds for secondary ion batteries.
In this talk, I would like to show our efforts of using advanced (scanning-) transmission electron microscopy ((S)TEM) to study the redox reactions of the electrode materials for secondary ion batteries. With/Combining different TEM techniques (including in situ TEM and diffraction, HAADF-STEM, and STEM-electron energy-loss spectroscopy (EELS)), researchers are able to probe local structural and chemical information of electrode materials, at a new era of resolution. Therefore, knowledge about the reaction dynamics and kinetics can be retrieved at different states of charging (discharging). I will introduce the background knowledge of battery and TEM, then show the cases on the conversion compounds for lithium/sodium ion batteries, for examples, In the cases of ion flourides used for cathode, we investigated the structural and chemical ordering at nanoscale and revealed some unexpected phenomenon. In case of NiO, the role of reaction pathways from near-surface redox to interior redox is highlighted which is supposed to affect the rate capability.
个人简介:
Education:
Ph. D in Condensed Matter Physics, Nanjing University, China, Dec. 2003
Dissertation advisors: Prof. Yening Wang (Physics Dept. NJU) and Prof. Kehsin Kuo (BLEM, Institute of Physics, CAS)
B.Sc. in Physics, Nanjing University, China, 1998
Research Experience:
Adjunct Professor
Department of Materials Science and Engineering, Stony Brook University, May, 2011-
Assistant/Associate Scientist/Scientist/Scientist with continuing appointment,
Center for Functional Nanomaterials, Brookhaven National Lab, June. 2008-
Research Areas:
TEM techniques (diffractive contrast imaging, HRTEM, STEM, and EELS etc.)
Energy Related Materials (Electrode materials for batteries, electro-catalysts)
Functional oxides for electronic devices and for energy storage
Recent Publications:
[1] Sodiation Kinetics of Metal Oxide Conversion Electrodes: a Comparative Study with Lithiation,
Kai He, Feng Lin, Yizhou Zhu, Xiqian Yu, Jing Li, Ruoqian Lin, Dennis Nordlund, Tsu-Chien Weng, Ryan M. Richards, Xiao-Qing Yang, Marca M. Doeff, Eric A. Stach, Yifei Mo*, Huolin Xin *, and Dong Su*, Nano Letters, 15, 5755, 2015 [2] Structure Stabilization by Mixed Anions in Oxyfluoride Cathodes for High-Energy Lithium Batteries,
Sung-Wook Kim, Nathalie Pereira, Natasha A. Chernova, Fredrick Omenya, Peng Gao, M. Stanley Whittingham, Glenn G. Amatucci, Dong Su*, and Feng Wang*, ACS Nano, DOI:10.1021/acsnano.5b03643
[3] Transitions from Near-Surface to Interior Redox upon Lithiation in Conversion Electrode Materials, Kai He, Huolin L. Xin, Kejie Zhao, Xiqian Yu, Dennis Nordlun, Tsu-Chien Weng, Jing Li, Yi Jiang, Christopher A. Cadigan, Ryan M. Richards, Marca M. Doeff, Xiao-Qing Yang, Eric A. Stach, Ju Li*, Feng Lin*, and Dong Su*, Nano Letters, 15, 1444, 2015
[4]Sodiation via Heterogeneous Disproportionation in FeF2 Electrodes for Sodium-Ion Batteries, K He, Y Zhou, P Gao, L Wang, N Pereira, GG Amatucci, KW Nam, X. Yang, Y. Zhu, F. Wang, and D. Su*, ACS Nano, 8 (7), 7251–7259, 2014
[5] Remarkably Improved Electrode Performance of Bulk MnS by Forming a Solid Solution with FeS–Understanding the LiStorage Mechanism, L. Zhao, X. Yu, J. Yu, Y. Zhou, S. Ehrlich, Y. S. Hu*, D. Su*, H. Li, X.Q. Yang*,and L. Chen, Advanced Functional Materials, 24(35), 5557-5566, 2014
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