Preparation method of manganous manganic oxide/nitrogen-doped carbon nanotube composite material

The invention discloses a preparation method of a manganous manganic oxide/nitrogen-doped carbon nanotube composite material. The preparation method specifically comprises the steps of configuring stripped carbon nanotubes into a striped carbon nanotube dispersion solution of a certain concentration; next, adding a certain amount of stronger ammonia water to change the dispersion solution into analkali dispersion solution; preparing a manganese salt into a manganese salt solution of a certain concentration, adding the manganese salt solution and a nitrogen source into the alkali dispersion solution, performing stirring for a certain time, and putting the alkali dispersion solution into an ultrasonic reactor at a constant temperature to be reacted for a certain time to obtain a dispersionsolution; and finally, performing repeated suction filtration and washing on the dispersion solution for multiple times, and then carrying out vacuum drying to obtain the manganous manganic oxide/nitrogen-doped carbon nanotube