IV-2 – Advances in High Spatial Resolution Probing of Local Heterogeneities in Ion Conducting Materials



Organizers: Peter Crozier (Arizona State University), David McComb (Ohio State University), Y. Shirley Meng (University of California, San Diego), M. Stanley Whittingham (Binghamton University).

Ion transport in solids is influenced by local heterogeneities such as grain boundaries, surfaces, point defects, and local strain fields at interfaces. Compositional heterogeneity may also affect ion conductivity either by changing the carrier concentration or migration energies.

Electrochemistry in solid-state energy storage devices (such as solid state metal-oxygen batteries and solid state batteries) occurs within a localized region near the interface between one or more solid phases. Behaviors of functional interfaces are crucial factors in the performance and safety of energy storage and conversion devices. Solid electrode−solid electrolyte interfacial impedance is now considered the main limiting factor in all-solid-state batteries rather than low ionic conductivity of the solid electrolyte. Recent advances in both characterization and diagnosis techniques, as well as computational modeling are beginning to shed novel insights into the reactivity, the local structure/composition, and the strain at the interfaces and interphases in governing the electrochemical properties.

Electron microscopy and scanning probe microscopy are powerful tools for elucidating local inhomogeneities in the bulk and surfaces of ion conductors at the nanometer and atomic levels. Aberration corrected and monochromated transmission electron microscopy allow the structures and compositions around such grain boundaries and interfaces to be directly probed at spatial resolutions down to the atomic level. Scanning probe microscopies are also able to provide local information on surfaces and by utilizing different signals, information related to structure and electrical properties can now be obtained. Relating atomic scale chemistry and structure to device level behavior increasingly demands multiscale and correlative approaches involving multiple microscopies and modalities to obtain insights in both 2D and 3D. The potential to extend these approaches to 4D through in situ and in operando approaches is being explored to allow local ionic transport processes to be correlated with dynamic structure and compositional changes. These approaches promise to significantly impact our understanding of the role of nanoscale features on ionic transport.

This symposium will provide SSI attendees with the latest advancement in new operando and in situ experimental methods that probe the thermodynamic state and kinetics of the phases formed at the interfaces, as well as imaging and spectroscopic methods that can spatially resolve local variations in structure, composition, and ion/electron transport properties. New insights provided from computational modeling including ab initio, molecular dynamics methods and other multi-scale methods are strongly encouraged.


Abstracts are solicited in, but not necessarily limited to, the following areas:

In this Symposium are also welcome those contributions which cover the topics beyond the above-described areas. This is done to provide the audience with a comprehensive description of Solid State Ionics. If your contribution is difficult to host within the above areas, please do not hesitate to contact directly the Conference Chairmen at ssi21@dii.unipd.it for advice.


List of Invited Speakers