▎ 摘　　要

NOVELTY - Method for synthesizing alpha -iron oxyhydroxide doped three-dimensional graphene foam quadrangular prism material, involves (a) dissolving ferric nitrate in deionized water, evenly stirring, adding urea to the solution, continuously stirring, and adding concentrated nitric acid to obtain a mixed solution (A), and (b) measuring the mixed solution (A), transferring to a stainless steel autoclave lined with PTFE, adding three-dimensional graphene, heating the stainless steel autoclave to the set temperature, heat-preserving at a heating rate of 10 degrees C.minute-1, setting the reaction time, cooling the reaction vessel to room temperature to obtain a product (B), washing the product (B) three times with water and ethanol, drying the product (B) in a vacuum oven, and washing to obtain a rod-shaped alpha -iron oxyhydroxide doped three-dimensional graphene foam quadrangular prism material. USE - The method is useful for synthesizing alpha -iron oxyhydroxide doped three-dimensional graphene foam quadrangular prism material used in battery negative electrode material (all claimed). ADVANTAGE - The method ensures to maintain excellent microstructure, and effectively alleviates the volume expansion problem caused by sodium ions during insertion and extraction, and improves the cycle stability of the electrode.