Hyperfine fields at the Li site in LiFePO4-Type olivine materials for lithium rechargeable batteries: A 7Li MAS NMR and SQUID study

作者： Michael C. Tucker , Marca M. Doeff , Thomas J. Richardson , Rita Fiñones , Elton J. Cairns

关键词: Electron 、 Lithium 、 Hyperfine structure 、 SQUID 、 Chemistry 、 Crystallography 、 Isotopes of lithium 、 Magnetic susceptibility 、 Transition metal 、 Nuclear magnetic resonance 、 Unpaired electron

摘要: The 7Li NMR isotropic shift for olivine LiMPO4 (M = Fe, Mn, Co, Ni) is assigned to hyperfine coupling between the nucleus and transition metal unpaired electrons on basis of Curie−Weiss temperature dependence shift. arises from a linear combination Li−O−M through-bond interactions wherein A‘ contribute negative A‘ ‘ positive constant determined each composition.