Lena F. Kourkoutis - New frontiers in cryo-electron microscopy: From Probing Low Temperature Electronic Phases to Processes at Liquid/Solid Interfaces
- Date: Jul 20, 2017
- Time: 02:00 PM - 03:00 PM (Local Time Germany)
- Speaker: Lena F. Kourkoutis
- Cornell University, Ithaca, NY, USA
- Location: CFEL (Bldg. 99)
- Room: Seminar Room I-II, EG.076-078
- Host: R. J. Dwayne Miller
Here, we will discuss our approach to study two processes at the anode-electrolyte interface in lithium metal batteries (LMBs), uneven deposition of lithium metal leading to dendrite growth and the breakdown of electrolyte to form a “solid- electrolyte interphase” (SEI) layer, processes which result in capacity fade and safety hazards. By combining cryo-STEM/EELS with cryo-FIB lift out , we provide nanoscale compositional information about intact SEI layers in cycled LMBs and track local bonding states at interfaces, leading to new insights into SEI and dendrite formation (Figure left).
We will further
demonstrate cryo-STEM imaging
at sub-Å resolution and atomic tracking
with picometer precision
in charge-ordered manganites. Using this technique, we measure transverse, displacive
lattice modulations of the cations,
distinct from existing
manganite charge-order models
and reveal temperature-dependent inhomogeneities in the stipe order such as shear deformations and topological defects, and the emergence of phase coherence well below
Tc (Figure right).
Correlating the atomic level structure and electronic properties at cryogenic temperatures is an important step in realizing the goal of understanding and controlling emergent phenomena in these materials.
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