▎ 摘　　要

NOVELTY - Preparing self-supporting porous nitrogen-doped graphene network lithium metal main body material comprises (1) dispersing graphene oxide in deionized water, ultrasonically dispersing to form a suspension, and obtaining a graphene oxide suspension, (2) adding vat red F3B dye to the graphene oxide suspension obtained in step (1), ultrasonically and uniformly stirring to obtain a mixed solution, (3) pouring the mixed solution obtained in step (2) into the template, placing it into an oven to self-assemble into a film through the liquid-gas interface, where the temperature is 35-90°C, and obtaining self-supporting composite film, and (4) heat-treating the composite film in step (3) under a protective atmosphere, where the heat treatment temperature is 300-1000°C for 0.5-5 hours and the heating rate is 1-15°C/minutes, and obtaining self-supporting porous nitrogen-doped graphene network lithium metal main body material. USE - The method is useful for preparing self-supporting porous nitrogen-doped graphene network lithium metal main body material. ADVANTAGE - The method realizes the high-rate performance of the lithium metal battery, promotes the development of the lithium metal battery, provides novel self-supporting lithium metal main body material for fast charging and discharging, and is easy to operate and can be prepared on a large scale. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for self-supporting porous nitrogen-doped graphene network lithium metal main body material prepared by the above preparation method.