Raman microscopy as a quality control tool for electrodes of lithium-ion batteries

The Raman mapping technique is shown to be suitable for quality control of both positive and negative electrodes for lithium-ion batteries. An analysis of the spectral features observed at a multitude of locations on the electrode surface allows a distribution of band parameters to be obtained that is unique for a given kind of electrode. It is shown that band positions, linewidths, and intensity ratios can be employed as descriptors of the distribution. Such distributions can in turn be used to generate a fingerprint for a particular kind of electrode.