▎ 摘　　要

NOVELTY - Selenium/graphene nano-composite material is claimed. The selenium is dispersing on the surface of reduced graphene oxide. USE - The nano-composite material is useful in preparing sodium-ion battery electrode material (claimed). ADVANTAGE - The nano-composite material has simple preparation process, excellent sodium storage performance and low-temperature cycle performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing selenium/graphene nano-composite material comprising (i) dispersing selenium powder in graphene oxide solution in a mass ratio of 2-5:1 and freeze-drying to obtain a mixture of selenium and graphene oxide, and (ii) heating at 200-600 degrees C and then calcining for 1-10 hours to obtain final product.