▎ 摘　　要

NOVELTY - Preparing nickel-iron battery, comprises (1) stirring the 3D printing paste evenly, and sequentially undergoing digital light processing printing, degreasing sintering and high temperature reduction to obtain a 3D porous nickel template, (2) depositing graphene on the surface of the 3D porous nickel template, and obtaining nitrogen-doped graphene foam after acid etching and freeze-drying, (3) the nitrogen-doped graphene foam surface electroplating nickel-cobalt hydroxide obtains the anode of the nickel-iron battery, (4) subjecting the nickel-iron battery to pyrolysis, depositing iron oxide on the surface to obtain the cathode of the nickel-iron battery, and (5) placing the anode of the nickel-iron battery, the negative poles of the nickel-iron batteries into the gel electrolyte and soaking, and bonding to each other to obtain the nickel-iron batteries. USE - The method is useful for preparing nickel iron battery. ADVANTAGE - The method is simple and environmentally friendly. The prepared nickel iron battery has high active material load amount of process electrode, good flexibility, and high energy density, high power density, and good cycle performance. The battery structure has high customized degree, and has wide application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a nickel iron battery.