The 7Li NMR isotropic shift for olivine LiMPO4 (M = Fe, Mn, Co, Ni) is assigned to hyperfine coupling between the 7Li 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.
BT - Journal of the American Chemical Society C3 -cairns group, doeff group
DA - 04/2002 DO - 10.1021/ja017838m IS - 15 LA - eng M1 - 15 N2 -The 7Li NMR isotropic shift for olivine LiMPO4 (M = Fe, Mn, Co, Ni) is assigned to hyperfine coupling between the 7Li 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.
PY - 2002 SP - 3832 EP - 3833 T2 - Journal of the American Chemical Society TI - Hyperfine fields at the Li site in LiFePO4-type olivine materials for lithium rechargeable batteries: A 7Li MAS NMR and SQUID study VL - 124 ER -