Microscale Measurements of the Electrical Conductivity of Doped LiFePO_4

摘要

Electrical conductivity at the microscopic grain level has been measured in densely sintered polycrystalline samples of LiFePO_4 and Li_(0.99)Nb_(0.01)FePO_4, using a four-point microcontact technique. The absolute value of conductivity as well as its spatial variability have been measured, and are consistent with previously reported bulk measurements. The results support the interpretation of the conductivity increase upon doping of LiFePO_4 as a lattice effect.