Journal
ADVANCED STRUCTURAL AND CHEMICAL IMAGING
Volume 1, Issue -, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/s40679-014-0002-2
Keywords
Image simulation; Atomistic model; Molecular Dynamics; in-situ microscopy; Electrochemistry; Electrical double layer
Categories
Funding
- Joint Center for Energy Storage Research (JCESR)
- United States Department of Energy (DOE)
- Office of Science
- Basic Energy Sciences (BES)
- University of California at Davis
- Laboratory Directed Research and Development (LDRD)
- Pacific Northwest National Laboratory, [DE-AC05-76RL01830]
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Understanding the fundamental processes taking place at the electrode-electrolyte interface in batteries will play a key role in the development of next generation energy storage technologies. One of the most fundamental aspects of the electrode-electrolyte interface is the electrical double layer (EDL). Given the recent development of high spatial resolution in-situ electrochemical fluid cells for scanning transmission electron microscopy (STEM), there now exists the possibility that we can directly observe the formation and dynamics of the EDL. In this paper we predict electrolyte structure within the EDL using classical models and atomistic Molecular Dynamics (MD) simulations. Classical models are found to greatly differ from MD in predicted concentration profiles. It is thus suggested that MD must be used in order to accurately predict STEM images of the electrode-electrolyte interface. Using MD and image simulation together for a high contrast electrolyte (the high atomic number CsCl electrolyte), it is determined that, for a smooth interface, concentration profiles within the EDL should be visible experimentally. When normal experimental parameters such as rough interfaces and low-Z electrolytes (like those used in Li-ion batteries) are considered, observation of the EDL appears to be more difficult.
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