title: Hyperfine fields at the Li site in LiFePO(4)-type olivine materials for lithium rechargeable batteries: a (7)Li MAS NMR and SQUID study.
abstract: 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.
authors.affiliation: Environmental Energy Technologies Division, Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory and Department of Chemical Engineering, University of California at Berkeley, California 94720, USA.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Tucker
authors.forename: Marca M
authors.initials: MM
authors.lastname: Doeff
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Richardson
authors.forename: Rita
authors.initials: R
authors.lastname: Fiñones
authors.forename: Elton J
authors.initials: EJ
authors.lastname: Cairns
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Reimer