▎ 摘　　要

NOVELTY - Preparing three-dimensional net-shaped graphene/nickel foam/tin selenide self-supporting material comprises (1) adding three-dimensional net-shaped graphene/nickel foam to ethylene glycol or glycerol, adding inorganic tin salt, stirring evenly, adding surface active substances until completely dissolved to obtain solution A; adding selenium powder into reducing solvent, stirring until completely dissolved, and obtaining solution B; and (2) adding solution B to solution A, stirring evenly, transferring to the reaction kettle, carrying hydrothermal reaction, cooling to room temperature and carrying heat treatment. USE - The self-supporting material is useful in preparation of alloy electrode materials (claimed). ADVANTAGE - The method: is simple, environmentally friendly, and economical; and has high repeatability, short preparation period, and low reaction temperature. The self-supporting material: has high specific capacity and cycle rate, when used as the negative electrode material of a sodium-ion battery, it can be sliced directly without additional coating process, which can make the sodium-ion battery have good electrochemical performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for three-dimensional net-shaped graphene/nickel foam/tin selenide self-supporting material is prepared by above mentioned method.