▎ 摘　　要

NOVELTY - Wide-temperature sodium-ion battery comprises anode, cathode, and electrolyte; the anode material is at least one iron-based polyanionic compound; the cathode is graphite, hard carbon and/or soft carbon; the electrolyte contains ether solvent, uses organic sodium salt and/or inorganic sodium salt as solute, and exhibits high ionic conductivity in the temperature range of -70 to 160℃; in electrolyte, the concentration of sodium ions is 0.01-10 mol/L. USE - The wide-temperature sodium-ion battery is used as energy storage device in areas with high cold, high temperature, and large changes in ambient temperature. ADVANTAGE - The wide-temperature sodium-ion battery: is based on iron-based polyanionic anode and carbon-based cathode, and economical; has high energy density; and can work stably in temperature range of 70-160°C, and exhibits good cycle performance, power characteristics and rate performance.