▎ 摘　　要

NOVELTY - Mechanical pulverization of magnesium, aluminum, zinc, iron (Mg, Al, Zn, Fe) micro nanomaterials involves grinding Mg, Al, Zn and Fe as raw materials via mechanical pulverization to form structured persimmon-like material; and further adding graphene powder in-situ to prepare anode material with high electrical conductivity, regular appearance and low cost. USE - Mechanical pulverization of magnesium, aluminum, zinc, and iron micro nanomaterials used for coating metal air battery negative electrode. ADVANTAGE - The method produces magnesium, aluminum, zinc, and iron micro nanomaterials with improved conductivity and corrosion resistance, thus providing metal air battery negative electrode with enhanced overall performance. DETAILED DESCRIPTION - Mechanical pulverization of magnesium, aluminum, zinc, iron (Mg, Al, Zn, Fe) micro nanomaterials comprises grinding Mg, Al, Zn and Fe as raw materials via mechanical pulverization to form structured persimmon-like material; and further adding graphene powder in-situ to prepare anode material with high electrical conductivity, regular appearance and low cost. It preferably involves taking 50 g combination of 99.9% Mg, Al, Zn, and Fe powder, transferring anode material to anhydrous anaerobic glove box having water and oxygen index of less than 1 ppm; adding mixture into mechanism grinding machine with total volume of 500 ml; grinding at 10-29000 revolutions per minute under grinding power of 500-1200 W for 1-50 minutes, while circulating cooling water in mechanical grinding machine through cooling water circulation system to keep grinding machine at 25 degrees C and to obtain 70-150 nm structured persimmon-like material with diameter of 15 mu m and thickness of 1.5-5.0 mu m; and adding 0.1-0.5 g graphene powder material in-situ so that Mg, Al, Zn, and Fe powder is coated on surface of graphene while rotating at 10-29000 revolutions per minute under grinding power of 500-1200 W for 1-15 minutes, in which graphene powder material has slice thickness of 5-10 nm and specific surface area of 100-1800 m2/g. The nanostructure Mg, Al, Zn, and Fe persimmon materials are encapsulated on surface of graphene metal, and are assembled into metal air battery.