▎ 摘　　要

NOVELTY - A ferrous carbonate/graphene composite material is a composite powder material of ferrous carbonate and graphene. The content of ferrous carbonate in the composite powder material is 80-95 %mass. USE - Ferrous carbonate/graphene composite material for cathode of sodium ion battery (claimed). ADVANTAGE - The ferrous carbonate/graphene composite material has uniform size, excellent electrochemical performance, magnification performance, circulation stability, strong operability, excellent reproducibility, and stable product quality. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation method of ferrous carbonate/graphene composite material; and (2) application of ferrous carbonate/graphene composite material in cathode of sodium ion battery.