Colorimetric determination of lithium-ion mobility in graphite composite electrodes

In situ methods for Li-ion battery research: A review of recent developments

“…However electrochemically induced macroscopic structural changes of electrodes and dendritic lithium formation can be investigated through (digital) optical microscopy. Since the color of lithiated graphite is a measure of its SoC [72], the (de)lithiation process of graphite can be studied with an optical microscope by tracking the color evolution.…”

Electrochemical characterization of rechargeable lithium batteries

“…The lithium content can also be determined by Raman spectroscopy or even neutron diffraction [143]. Maire et al [144] developed a fast and simple quantification technique to assess visually the homogeneity of a reaction. They are also difficult to handle and expensive to perform.…”

“…To validate the concept, the authors [144] cycled a graphite electrode during a discharge/charge cycle and quantified the lithium content. The images were fitted using a calibration method (see Figure 7.40a).…”

“…This is the case for Li-S batteries, for example [146]. [144]. Those polysulfides can be a long or a short chain and their color depends on the number of sulfur atoms (from Li 2 S 8 to Li 2 S 2 ).…”

Fibre Optic Sensor for Characterisation of Lithium‐Ion Batteries

“…These properties make them promising for sensor applications in LIBs. Several optical concepts for monitoring battery performance have previously been studied, almost exclusively focusing on graphite electrodes [12–14] . For example, Xie and Lu studied the extraction of lithium‐ions from fully lithiated petroleum coke electrodes using a photometric cell and in situ UV/Vis diffuse reflectance [12] .…”