Preparation method of lithium manganese iron phosphate containing thiophene carbon nanotube conductive agent

The invention discloses a preparation method of lithium manganese iron phosphate containing a thiophene carbon nanotube conductive agent, and belongs to the technical field of lithium batteries. The modified polyacrylic acid LA133 provided by the invention has functional groups such as thiophene and pyrrole sulfide, and is used for coating a carbon nanotube as a conductive additive to improve the specific discharge capacity performance of lithium manganese iron phosphate: thiophene and pyrrole sulfide have relatively good conductivity; the electron conduction capability of the polymer can be improved. By coating the carbon nanotubes, the functional groups can further promote electron transfer among the carbon nanotubes, so that an effective conductive network is constructed. After the sulfur-doped carbon nanotube is combined with the modified polyacrylic acid LA133, the overall conductivity can be remarkably improved. The structural stability of the material in the charging and discharging process is favorabl