Phosphates Versus Layered Oxides
Oxide ions, in LiFePO4, as well as in LithiumWerk’ patented LiFe1-yMgyPO4 olivine structure, form a hexagonal close packing (hcp) arrangement. The metal (Fe) ions form zigzag chains of octahedra in alternate basal planes bridged by the tetrahedral phosphate groups (PO4).