▎ 摘　　要

NOVELTY - Graphene composite potassium and silicon co-doped sodium vanadium phosphate-composite material (I), is new. USE - The composite material is useful in preparing cathode active materials for sodium-ion batteries (claimed). ADVANTAGE - The material: replaces the sodium position in the sodium vanadium phosphate with the position part and replacing the phosphorus position in the sodium vanadium phosphate with the silicon(4+) part; can not only enhance the stability of the structure; can improve the conductivity of sodium vanadium phosphate by expanding the channel for sodium ion migration; and at the same time exhibits excellent rate performance and cycle performance in the process of electrochemical performance testing. DETAILED DESCRIPTION - Graphene composite potassium and silicon co-doped sodium vanadium phosphate-composite material of formula (Na3-xKxV2(PO4)3-y(SiO4)y-rGO), is new. x = 0-1; and y = 0-0.2. An INDEPENDENT CLAIM is included for preparation of (I).