METHOD FOR SYNTHESIS OF MN-O-C NANOCOMPOSITE Russian patent published in 2021 - IPC B22F9/14 B82B3/00 B22F1/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, particularly, to a plasma-arc technology for synthesis of nanocomposite particles of the Mn-O-C system, and can be used as a material for supercapacitor electrodes. A mixture of MnO₂ and graphite powders at a weight ratio of 1:1 is pressed into a cavity of a composite electrode. The electrode is dispersed in plasma of a direct current electric arc discharge at a buffer gas pressure of 50 Torr. Depending on the required ratio of carbide and oxides in the synthesised nanocomposite, the process is executed in a helium atmosphere providing the predominant amount of manganese carbide nanoparticles Mn₇C₃ or in a nitrogen atmosphere providing the predominant amount of manganese oxide nanoparticles MnO, Mn₃O₄. The resulting nanoparticles are annealed by heating at a rate of no more than 5 degrees per minute to a temperature of 300°C and sustaining for two hours to obtain a nanocomposite containing a carbon matrix and nanoparticles of MnO, Mn₃O₄ oxides and manganese carbide Mn₇C₃ with a particle size of 2 to 20 nm, with electrochemical capacity no less than 357 F/g.

EFFECT: production of a nanocomposite with a controlled content of nanoparticles, high cyclic stability and high electrochemical capacity is ensured.

1 cl, 7 dwg, 1 tbl