The effect of Cr or Cu doping on the electronic conductivity of LiCoPO 4 was investigated. It was observed that neither type of doping for the samples heated under air lead to electronic conductivity values above ∼10 −9 Scm −1 . Based on these results it is suggested that the room temperature electronic conductivity of LiCoPO 4 is much lower than that for LiFePO 4 . For the case of the doped samples heated under argon, they all exhibited an electronic conductivity ∼10 −4 Scm −1 . It is likely that the enhanced conductivity of the LiCoPO 4 samples heated under argon versus air is a result of conductive Co 2 P along LiCoPO 4 particle surfaces that forms as a result of carbothermal reduction during heat-treatment. The electronic conductivity of the LiCoPO 4 samples heated under high-purity argon is essentially independent of dopant type and concentration. This is because it is the conductive Co 2 P layer that controls the electronic conductivity of the doped samples overriding any possible dopant effects.