▎ 摘　　要

NOVELTY - A manganese oxide-nitrogen-modified graphene composite material is prepared by adding graphene oxide to 30 mL deionized water, stirring, ultrasonic dispersing, adding nitrogen-containing substance, ultrasonic dispersing, adding metal manganese salt and precipitant, stirring for 10 minutes, performing hydrothermal reaction at 160 degrees C for 3-5 hours, centrifuging, taking hydrothermal product, drying precipitate, and calcining at 400-500 degrees C for 2 hours under argon atmosphere. USE - Method for preparing manganese oxide-nitrogen-modified graphene composite material used for lithium ion batteries (claimed). ADVANTAGE - The product has improved nanoparticle dispersion degree and stability, exhibits good cycling stability and rate performance, and has simple preparation with high repeatability.