Effect of Ball Milling With the Addition of ZIF‐67 on the Electrode Properties of La 10 Ce 5 Fe 5 Ni 70 Mn 6 B 2 Al 2 Electrode Alloy

ABSTRACT This paper investigates the modification of La‐Fe‐B system nickel‐metal hydride battery anode materials. La 10 Ce 5 Fe 5 Ni 70 Mn 6 B 2 Al 2 was used as a reference sample, and the annealing‐treated ZIF‐67 (zeolitic imidazolate framework‐67) was doped by high‐energy ball milling to prepare composite electrode materials. The effects of different doping amounts of ZIF‐67 on the microstructure and electrochemical properties of materials are analyzed. The doped annealed treated ZIF‐67 positively affected the phase structure of the alloy. The phase structure of the composite alloy was two phases, LaNi 5 and LaNi. The cell volume of LaNi 5 and LaNi phases increased at doping levels of 1 and 3 wt.%. This structural change helps to improve the discharge properties of the material. The composite electrodes of ball‐milled doped annealed‐treated ZIF‐67 showed significant performance advantages at room temperature. In terms of maximum discharge capacity and cycling stability, the maximum discharge specific capacity increased to 234.3 mAh g − 1 with 1 wt.% doping, and the cycling stability was significantly improved with S 100 (%) reaching 42.9%. The annealed ZIF‐67 has good catalytic performance, and the best high‐frequency discharge performance was achieved at a doping amount of 3 wt.%. High‐rate dischargeability (HRD) of the composite electrode of ball‐milled doped annealed‐treated ZIF‐67 was improved at low temperature (−10°C).