Monday, January 4, 2010, 2:30 pm — Seminar Room, Bldg. 725
The rational design of improved battery electrodes for Li-ion batteries faces many barriers, not the least of which is a correct, fundamental understanding of the changes in local electronic structure that accompany insertion and removal of lithium. For this reason, the DOE report “Basic Research Needs for Electrical Energy Storage†singled out nonresonant inelastic x-ray scattering (NIXS) as a promising technique for in situ studies of these basic electrochemical processes. NIXS at ~1 eV energy resolution provides a bulk-sensitive alternative to x-ray absorption spectroscopy for studies of low-energy (<1.5 keV) electronic transitions. Furthermore, at sufficiently high momentum transfers NIXS is sensitive to dipole-forbidden transitions, providing additional information about electronic structure. After illustrating these issues with a study of Na 1s core excitons in NaCl and NaF, I will discuss the application of NIXS to ex situ and in situ studies of lithiation of transition metal oxide compounds.
Hosted by: Bruce Ravel
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