Development of In Situ Infrared Spectroelectrochemical Techniques: Application to Lithium Intercalation Reactions in Electrode Materials
Final rept. 5 Jul 2004-4 Apr 2007
OKLAHOMA UNIV NORMAN
Pagination or Media Count:
We developed an in situ IR transmission electrochemical cell, which was initially used to study lithium intercalation in a phospho-olivine LixFePO4 cathode. We had previously characterized vibrational spectrum of this material as part of a preliminary study. The transition between LiFePO4 and FePO4 could easily be followed in the in situ spectra. An industrially available coin cell was modified to facilitate routine in situ Raman measurements of lithium batteries. Available in situ Raman cells are usually designed to optimize optical throughput, resulting in cell geometries significantly different from those used in normal electrochemical investigations. The chargedischarge curves of our cell were very similar to those of unmodified coin cells. This cell was used to study lithium intercalation in a lithium vanadium pentoxide cathode.
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy