Real Space Mapping of Ionic Diffusion and Electrochemical Activity in Energy Storage Materials

The electrochemical energy storage systems based on Li-based insertion and reconstitution chemistries are a vital component of future energy technologies. Development of high energy and power density materials necessitates understanding the nanoscale mechanisms involved in Li-battery operation, including the interplay between the interfacial electrochemical reactions, electron and Li-ion diffusion, and structural defects. We demonstrate an approach for probing of Li diffusivity and electrochemical reactivity on the nanometer length scales on the free electrochemically active surfaces and packaged devices, providing insight into the battery operation on a level of single structural element.

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