METHOD FOR MANUFACTURING CARBON-COATED NANOMETER Fe3O4 FOR BATTERY

摘要

The present invention provides a method for manufacturing a carbon-coated nanometer Fe3O4 for a cathode of a battery. The manufacturing method includes the following steps: dry mixing Fe3O4 and high-purity conductive carbon black, adding the dry-mixed Fe3O4 powder and conductive carbon black into a prepared NaOH solution, adding a prepared NaBH4 solution into the reaction solution, and conducting aging, pure water cleaning, ultrasonic dispersing, filtering, drying, screening, and seal packing. An iron nickel battery which is produced using the manufacturing method for carbon-coated nanometer Fe3O4 for an electrode of a battery provided in the present invention has high capacity per gram, high charging and discharging efficiency and low self-discharging, is capable of being sealed, and has a simple process, high strength and long life.

主权项

1. A method for manufacturing carbon-coated nanometer Fe3O4 for a cathode of a battery, wherein the manufacturing method comprises the following steps:
(1) crushing and screening Fe3O4 at 300 to 400 meshes and dry mixing the Fe3O4 and high-purity conductive carbon black having a particle diameter of 0.1 to 0.3 μm for 0.5 to 1 hour; (2) preparing an NaOH solution having a concentration of 0.05 M to 3 M using pure water; (3) adding the dry-mixed Fe3O4 powder and conductive carbon black into the prepared NaOH solution, and continuously stirring for 0.5 to 1.5 hours after the dry-mixed materials are added into the solution; (4) slowly adding an NaBH4 solution having a concentration of 0.05 M to 3 M that is prepared using pure water into the reaction solution obtained in step (3), wherein after the NaBH4 solution is added into the reaction solution, a weight ratio of the components in the mixed solution in the whole vessel is within the following proportion range: Fe3O4:conductive carbon black:NaOH:NaBH4:pure water=6.45-8.86:0.645-0.886:2.15-2.95:1.07-1.48:85.8-89.68, and continuously electrifying and stirring for 2 to 3 hours; (5) aging the reaction solution after the reaction; (6) cleaning with pure water; (7) ultrasonic dispersing; (8) filtering; (9) drying; (10) screening at 300 to 400 meshes; and (11) seal packing for use.