Articles by Marca M. Doeff in JoVE
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques Marca M. Doeff1, Guoying Chen1, Jordi Cabana1,2, Thomas J. Richardson1, Apurva Mehta3, Mona Shirpour1, Hugues Duncan1, Chunjoong Kim1, Kinson C. Kam4, Thomas Conry5 1Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, 2Department of Chemistry, University of Illinois at Chicago, 3Stanford Synchrotron Radiation Lightsource, 4Haldor Topsøe A/S, 5PolyPlus Battery Company We describe the use of synchrotron X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) techniques to probe details of intercalation/deintercalation processes in electrode materials for Li-ion and Na-ion batteries. Both in situ and ex situ experiments are used to understand structural behavior relevant to the operation of devices
Other articles by Marca M. Doeff on PubMed
Hyperfine Fields at the Li Site in LiFePO(4)-type Olivine Materials for Lithium Rechargeable Batteries: a (7)Li MAS NMR and SQUID Study Journal of the American Chemical Society. Apr, 2002 | Pubmed ID: 11942811 The (7)Li NMR isotropic shift for olivine LiMPO(4) (M = Fe, Mn, Co, Ni) is assigned to hyperfine coupling between the (7)Li nucleus and the transition metal unpaired electrons on the basis of the Curie-Weiss temperature dependence of the shift. The hyperfine shift arises from a linear combination of Li-O-M through-bond interactions wherein the unpaired A' electrons contribute a negative shift and the unpaired A' ' electrons contribute a positive shift. The hyperfine coupling constant is determined for each composition.