TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The lithium iron phosphate flakes have petal-like shapes. The angle between the flat surface normal of the lithium iron phosphate flakes and the lithium-ion diffusion channel is 30-65 degrees . The angle between a zone axis of the flat surface of the lithium iron phosphate flakes and a b-axis (0, 1, 0) of the lithium-ion diffusion channel is 0-80 degrees , preferably 30-65 degrees . The width of the lithium iron phosphate flakes is 500 nm to 5 mu m. The lithium iron phosphate flakes have olivine structures. The lithium-containing precursor is at least one of lithium hydroxide, dilithium carbonate, lithium nitrate, lithium acetate dihydrate, lithium oxalate, lithium sulfate, lithium chloride, lithium bromide or lithium iodide. The iron containing precursor is at least one of ferrous chloride, ferrous bromide, ferrous iodide, ferrous sulfate, ammonium iron(II) sulfate, ferrous nitrate, ferrous oxalate, ferrous acetate or ferrous carbonate. The phosphate-containing precursor is at least one of phosphoric acid, monosodium phosphate, disodium hydrogen phosphate, magnesium phosphate or ammonium phosphate monobasic. The phosphate and lithium-containing precursor is at least one of lithium dihydrogen phosphate, lithium biphosphate or lithium phosphate. The phosphate and iron-containing precursor is at least one of ferrous phosphate or ferric phosphate. The mixed organic solution further comprises at least one of surfactant, polymer electrolyte or stabilizer. The atmosphere or the introduced gas flow comprises nitrogen, helium, neon, argon, krypton, xenon, cobalt, methane and/or nitrogen-hydrogen mixed gas. The surfactant is cetyltrimethylammonium bromide, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate or Triton-X100 (RTM: Nonionic surfactant). Preferred Method: The organic mixed solution is heated under an atmosphere or with an introduced gas flow to obtain the preliminary products, in step (b). The preliminary products are heat-treated under an atmosphere or with an introduced gas flow to obtain the lithium iron phosphate flakes, in step (c). The organic mixed solution is heated to and reacted at 105-350 degrees C in step (b). The organic mixed solution is reacted for 10-20 hours. The preliminary products are heat-treated at 300-700 degrees C in step (c) for 1-20 hours.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - The organic solvent in the mixed organic solution is at least one of ethylene glycol, diethylene glycol, glycerol, triethylene glycol, tetraethylene glycol, polyethylene glycol, dimethyl sulfoxide or N,N-dimethylmethanamide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer electrolyte is polyvinylpyrrolidone, peroxyacetic acid, polyethyleneimine or polyacrylamide. The stabilizer is polyvinyl alcohol or polyvinyl acetate. EXAMPLE - No suitable example given.