Meaning
Dynamic resonance measurements capture real time changes in the atomic structure of an electrode as the cell is actively charged and discharged. Employing operando NMR spectroscopy provides a clear window into the chemical species that form at the lithium interface without stopping the electrochemical process. This method offers the unique ability to track transient intermediates that disappear as soon as the current stops flowing.
Isotope Tracking
Nuclear magnetic moments provide specific signatures for different atomic environments inside the cell casing. During operando NMR spectroscopy sensors detect the rise of metallic lithium dendrites and the breakdown of electrolyte additives. These signals reveal which reaction pathways dominate under specific fast charge protocols or thermal conditions.
Interface Depth
Surface reactions can be distinguished from bulk changes based on the resonance frequency shifts of the core atoms. Since operando NMR spectroscopy monitors the live environment, it records the exact timing of structural transitions within cathode materials like nickel rich oxides. This information is key for designing materials that do not crack under rapid expansion.
Signal Analysis
Sophisticated shielding ensures that the metal casing of the test cell does not interfere with the recorded data. Utilizing operando NMR spectroscopy confirms the lifespan of artificial interface coatings in prototype high capacity storage systems.
