Japanese researchers develop nanoscale mapping for lithium-ion battery reactions

Researchers in Japan have developed new methods to visualize electrochemical reactions within lithium-ion batteries at the nanoscale. Chiba Institute of Technology, in collaboration with Nagoya University, Tohoku University, and Tokyo University of Science, successfully mapped local reactions in composite electrodes using Scanning Electrochemical Cell Microscopy (SECCM).

By utilizing a nanopipette with an opening diameter of approximately 100nm, the team was able to identify how reactions differ across various regions of the electrode, such as graphite and silicon areas. This technique allows for the spatial mapping of the Solid Electrolyte Interphase (SEI) film, revealing that its formation is non-uniform across the electrode surface. This provides a more precise understanding than traditional methods that rely on average values.

Complementary advancements in operando observation techniques are also being highlighted, such as using visible-light-transparent copper thin films to observe battery internals in real-time. These technologies aim to monitor phenomena like lithium dendrite formation and gas generation, which are critical to improving battery lifespan, safety, and the development of next-generation anodeless batteries.