The invention discloses a method for preparing
metal-silver-
doped carbon-covering
lithium iron phosphate of
lithium-
ion battery
cathode material, comprising steps: A. mixing
lithium compound,
phosphate and silver compound together according to the
mole ratio of Li: P: Ag, and dissolving by water; sequentially adding
citric acid and glycol, and stirring to prepare collosol; B. adding organic
sugar with the
molar weight of 1-2 times of that of silver salt into the collosol, adding iron compound with the mole number being the same as that of lithium salt and carbon
reducing agent with the equal
molar weight based on pure carbon, and evenly mixing,
vacuum drying and ball-milling the mixture; then, pressing the mixture
powder to be molded after ball-milling, and preparing precursor of synthesized
lithium iron phosphate; C. putting the obtained precursor into a vacuum reaction furnace to have reaction under the condition of certain vacuum degree, and ball-milling to obtain the
metal-silver-
doped carbon-covering
lithium iron phosphate LiFePO4 / Ag / C
cathode material. The method has the advantages of simple technique, easy amplification, good electric conduction performance, excellent high-rate
discharge performance, high specific capacity and
electrochemistry efficiency,
small particle size distribution range and high tap density.