Anisotropic Lithium ion Migration in LiFePO_4

An anisotropic behavior of lithium ion migration in LiFePO_4 is investigated using the cathode particles after chemical delithiation. A phase contrast of a LiFePO_4 particle validating the directional property is also found. It suggests that the lithium ion migration path is limited to the [010] direction and the phase boundary between LiFePO_4 and FePO_4 is perpendicular [010]. The symmetric phase boundary inside the LiFePO_4 particle is contrary to the non-directional core-shell model reported by others. The molecular dynamics simulation confirms the crystallographic direction with the lowest energy for lithium ion migration. KCI Citation Count: 1