City University of Hong Kong

Invited Speaker


Dr. Liu Qi is currently an assistant professor in the Department of Physics, City University of Hong Kong. He obtained his Ph.D from Purdue University in 2014. Before joining CityU, he worked as a postdoctoral fellow at Argonne National Laboratory. His current research interests focus on the structure-property-studies of functional materials via multiple neutron- and synchrotron-based techniques. His broad research activities include the design and synthesis of novel energy storage materials, phase transition mechanism and neutron-/synchrotron physics. 

Discovery and Fundamental Studies of Cathode Materials via Advanced Synchrotron Techniques


City University of Hong Kong, Hong Kong 

Keywords: Lithium ion batteries, synchrotron, cathode, energy storage.


Because of their high energy density, lithium ion batteries (LIBs) have become a rapidly growing energy storage technology, particularly in mobile applications, such portable electronics, electric vehicles, etc. Typically, in the LIBs, the cathode materials are considered to be the performance-limiting factor in research designed to increase cell energy and power density. During the cathode materials exploration, the advanced synchrotron-based characterization techniques, such as high-resolution synchrotron X-ray diffraction (HRXRD), in situ high-energy synchrotron X-ray diffraction (HEXRD), and in situ X-ray absorption spectroscopy (XAS), provide novel and powerful tools for investigating the structural evolution of battery materials [1]. Here, in my presentation, I will briefly introduce how synchrotron-based techniques could be utilized for phase identification, fundamental study of structure dynamics, reaction mechanism and doping mechanism. Then, the presentation will be centered on fundamental studies of LiNixMnyCOzO2 (x+y+z=1) as the cathode materials for Li-ion batteries. Typically, the in-depth investigation of phase transformation behavior in LiCoO2 and single crystal Ni-rich NMC materials will be systematically studied [2-3]. 

Figure 1: Discovery and Fundamental Studies of Cathode Materials via Advanced Synchrotron Techniques


[1] H. Zhu et al., 8, 2003534(2021)

[2] Q. Liu et al., Nature Energy 3, 936 (2018).

[3] H. Zhu et al., Nano Letters 21, 9997(2021).

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