Charge transfer at electrode/electrolyte interfaces for Li-ion battery systems is generally inhomogeneous, leading to a structural component that dictates the location of Li plating, alloying or intercalation with the anode. In order to define the structural characteristics that active these regions of an electrode surface, we have implemented in-situ electrochemical transmission electron microscopy with conductive- and liquid-atomic force microscopy. These techniques are used to identify how the electrode surface structure changes after exposure to the electrolyte and initial charge transfer. Correlation between the conductive map of an ultra-microelectrode surface and the grain orientation mapping can aide in predicting the nucleation sites on an electrode surface within carbonate electrolytes. In Li-metal anodes, the density of the deposited Li is about half of the expected value if the Li were to evenly grow as a continuous layer. We will share our findings on understanding the Li deposition mechanisms to provide design routes for future Li metal anode battery systems.<br/><br/>This work was performed at the Center for Integrated Nanotechnologies (CINT), a U.S. DOE Office of Basic Energy Sciences (BES) user facility. Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly-owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04- 94AL85000. Portions of this work were funded by the Joint Center for Energy Storage Research (JCESR) a DOE BES energy hub, and other portions were supported as part of the Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center funded by the U.S. DOE, Office of Science.

Correlating structure and electron transfer at nucleation sites on electrode surfaces

254th National Meeting (2017)

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