The invention relates to the technical field of
lithium battery positive
electrode material preparation, in particular to coated doped type
lithium manganese iron phosphate gradient
temperature control preparation equipment and method.The equipment comprises five
temperature control bins arranged side by side, a
sintering bin, a vertical flow guide plate, a unique
temperature control gas inlet
assembly and the like work cooperatively, the temperature control gas inlet
assembly can flexibly adjust the gas state, and the temperature control gas inlet
assembly can control the temperature of the
lithium manganese iron phosphate; the preparation method comprises the following steps: firstly, mixing a lithium source, a
manganese source and the like with a specific composite
carbon source, and performing
spray drying to obtain precursor particles; according to the preparation method, the defects of a traditional preparation technology in the aspects of temperature control and
coating forming are overcome, accurate gradient temperature control can be achieved, the temperature uniformity can be improved, the
coating effect can be optimized, and the preparation method is suitable for industrial production. And the performance of the lithium manganese
iron phosphate positive
electrode material is remarkably improved.