METHOD FOR PRODUCING LITHIUM MANGANESE IRON PHOSPHATE PARTICULATE POWDER, LITHIUM MANGANESE IRON PHOSPHATE PARTICULATE POWDER AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY USING THAT PARTICULATE POWDER

摘要

Disclosed is a method for producing an olivine structured lithium manganese iron phosphate, LiMn1-xFexPO4 (0.05 = x = 0.5), particulate powder. The method is characterized by a first step for obtaining a water-based slurry by the neutralization reaction of a mixed solution of starting materials and a second step of carrying out heat treatment of the slurry obtained in the first step, having a production rate of 75 wt% or greater for the LiMn1-xFexPO4 (0.05 = x = 0.5) compound obtained and washing that compound after making the crystallite size 10 - 250 nm. The method is further characterized by a third step for obtaining a precursor powder with 3 - 40 wt% carbon content by adding an organic substance to the compound obtained in the second step and a fourth process for firing the precursor powder obtained in the third step. The particulate powder can be produced easily at low cost, and the charge and discharge capacity is large for secondary batteries. Also disclosed is a secondary battery using the method for producing the lithium manganese iron phosphate particulate powder, which has superior filling properties and repeated charging and discharging characteristics.