There are four main types of olivine phosphates, namely LiFePO4, LiNiPO4, LiMnPO4, and LiCoPO4. The process of dedoping lithium is accompanied by the redox reaction of M3 / M2 pairs. The voltages are 3.4 ~ 3.5V, 5.0 ~ 5.4V, 4.0 ~ The data of 4.2V and 4.7 ~ 4.8V, LiNiPO4 are mainly the results of theoretical predictions; the above data are relative to metallic lithium, if it is about 0.3V less than the carbon negative electrode. Oxygen is densely packed in the structure, Li and M are located at 1/2 of the octahedron position, P occupies 1/8 of the tetrahedron position, that is, 4a and 4c position, and the MO6 octahedron shares four corners on the BC plane. The a-axis is connected by the PO4 group. It is also an olivine structure. The structure of the transition metal will be slightly different, especially when the transition metal is Mn, because the trivalent Mn has JT deformation.

       Low electrical conductivity is a basic feature of this type of material. The methods to overcome include elemental doping and carbon coating on the particle surface. For example, Chung reported that the conductivity of LiFePO4 increased by at least 8 orders of magnitude after Nb5 doping, but the results are still doubtful.