▎ 摘　　要

NOVELTY - Multilayer graphene and lithium-iron phosphate intercalation composite material is formed by preparing composite precursor using multilayer graphene, trivalent iron salt, phosphorus source compound, lithium source compound and organic micromolecule carbon source compound by rheological method, and sintering. Molar ratio of iron contained in trivalent iron salt, and phosphorus contained in phosphorus source is 1:1. Molar ratio of lithium in lithium source compound and phosphorus in phosphorus source compound is 1-1.1:1. USE - Multilayer graphene and lithium-iron phosphate intercalation composite material is used for lithium-ion battery (claimed) for electric vehicle. ADVANTAGE - The multilayer graphene and lithium-iron phosphate intercalation composite material has high electroconductivity. The lithium-ion battery containing multilayer graphene and lithium-iron phosphate intercalation composite material has high charging and discharging characteristics, and specific capacity of more than 60 mA.h.g-1. DETAILED DESCRIPTION - Multilayer graphene and lithium-iron phosphate intercalation composite material is formed by preparing compound precursor using multilayer graphene, trivalent iron salt, phosphorus source compound, lithium source compound and organic micromolecule carbon source compound by rheological method, and sintering. Molar ratio of iron contained in trivalent iron salt, and phosphorus contained in phosphorus source is 1:1. Molar ratio of lithium in lithium source compound and phosphorus in phosphorus source compound is 1-1.1:1. The theoretical yield of organic micromolecule carbon source compound and lithium-iron phosphate is in the ratio of 0.4-0.8:1. The theoretical yield of multilayer graphene and lithium-iron phosphate is in the ratio of 0.005-0.3:1. INDEPENDENT CLAIMS are included for the following: (1) manufacture of multilayer graphene and lithium intercalation composite material. Multilayer graphene, trivalent iron salt, phosphorus source compound, lithium source compound, and organic micromolecule carbon source compound are weighed, and mixed to obtain mixture, deionized water is added into the mixture, and then ultrasonically stirred for 2-4 hours, to obtain dispersion. The obtained dispersion is placed at 50-100 degrees C to form intercalation composite. The formed intercalation composite is dried to obtain composite precursor powder. The obtained composite precursor powder is processed at 200-300 degrees C for 2-4 hours, in inert gas and/or reducing gas protective atmosphere furnace and decomposed, to obtain intermediate product. The obtained intermediate product is processed at 550-650 degrees C for 5-12 hours in inert gas and/or reducing gas protective atmosphere furnace, and then cooled to room temperature, to obtain calcined product. The obtained calcined product is crushed, to obtain multilayer graphene and lithium intercalation composite material. Molar ratio of iron in trivalent iron salt, phosphorus in phosphorus source compound, and lithium in lithium source compound, is 1:1:1-1.1. The mass ratio of organic micromolecule carbon source compound and lithium source compound is 0.4-0.8:1. The molar ratio of multilayer graphene and lithium source compound is 0.005-0.3:1. The addition amount of deionized water is 5-10 times of mass percentage of mixture; and (2) lithium-ion battery, which contains positive electrode, negative electrode, separating film and aluminum-plastic composite film. The separating film is provided on surface of positive electrode and negative electrode. The aluminum-plastic composite film wraps the positive electrode, negative electrode and periphery of separation film. The positive electrode has positive current collector. The positive slurry formed using graphite and lithium intercalation composite material (80-95%), conductive agent (2-10%) and polyvinylidene fluoride (3-10%) as binder is coated on the positive current collector, and coated positive current collector has surface density of 50-200 g/m2.