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We introduce low levels of CsClO4 and RbClO4 into the electrolyte of LiCoO2 electrochemical half-cells to probe the composition of the passivation film on the surface of the cathode, the electrolyte decomposition layer (EDL). The advantages of these heavy alkali dopants lie in their large ionic radii, which limit intercalation, yet their strong light scattering cross-section creates a beacon that...
The local structure of nanoscale (∼10–40nm) LiCoO 2 is monitored during electrochemical cycling utilizing in-situ X-ray absorption spectroscopy (XAS). The high surface area of the LiCoO 2 nanoparticles not only enhances capacity fade, but also provides a large signal from the particle surface relative to the bulk. Changes in the nanoscale LiCoO 2 metal-oxide bond lengths, structural...
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