▎ 摘　　要

NOVELTY - Compound polycrystalline structure lithium manganese iron phosphate is doped with at least two different carbon-containing substances and iron source containing gas, gel source and lithium source under the high temperature calcining to form a composite polycrystal structure graphene lithium-iron-manganese phosphate. USE - Composite polycrystalline structure graphene lithium manganese phosphate is useful in lithium ion battery, energy storage power station and electric automobile field applications. ADVANTAGE - The composite polycrystalline structure manganese lithium iron phosphate has good charging and discharging performance, compacting density and processing performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing the composite polycrystalline structure manganese lithium iron phosphate. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a composite polycrystalline structure graphene lithium manganese phosphate.