Helmholtz-Zentrum Geesthacht, 2017-10-19
http://www.hzg.de/056110/index_0056110.html.en

"Nanoconfined borohydrides with optimised scaffolds and pore sizes for electrochemical energy storage"

Priscilla Huen / Early Stage Researcher at the Aarhus University, Denmark

Working title of thesis

Nanoconfined borohydrides with optimized scaffolds and pore sizes for electrochemical energy storage.

Objectives

  • To synthesize nanoconfined electrochemical energy storage materials
  • To study the thermodynamics, kinetics, structures and solid state diffusion of the nanoconfined materials
  • To evaluate the potentials for industrial application

Tasks and methodology

Materials will be selected among metal borohydrides, reactive hydride composites and systems like Li3N-T-H (T: transition metal).  

The selected materials will be synthesized with scaffolds of different nanopore sizes and their electrochemical performance will be tested in battery half-cells. The thermodynamic and kinetic properties and solid state diffusion will be investigated by electrochemical protocols such as PITT, GITT and EIS. 

Confinement effects on negative electrodes will be studied with a special focus on the fast charging kinetics and high cycling stability. The topology of the electrodes, before and after several charging and discharging cycles, will be evaluated by BET, Tomography Atom Probe studies, TEM, SEM as well as X-ray imaging. 

Furthermore, the structure and phase transformation of the materials during electrochemical operation will be investigated by operando synchrotron radiation powder X-ray diffraction.  

Short CV

Priscilla Huen received her BSc. in Chemistry from the Hong Kong University of Science and Technology in 2011, and MSc. in Renewable Energy Management from the University of Freiburg in 2013. She worked as a research assistant at the Fraunhofer Institute for Solar Energy Systems (ISE) from 2013 to 2014. She is currently pursuing her PhD at Aarhus University under the supervision of Associate Prof. Torben R. Jensen and Assistant Prof. Dorthe B. Ravnsbæk. Her research focuses on nanoconfined hydride materials for electrochemical energy storage.