Although a low-Al or an Al-free design is an efficient way to develop low-temperature and high-rate metal hydride alloys, the cycling life of these alloys is poor. Our strategy is to employ B-side anti-corrosion elements (e.g., Fe, Si, Sn, Cu) to coordinate the low-temperature and high-power delivery with cycling life. We confirmed that excellent electrochemical kinetics (i.e., surface catalytic and bulk H-diffusion ability) is the primary condition for low-temperature and high-rate delivery, while it reverses with anti-corrosion ability. As a result, the low-temperature dischargeability (LTD), high-rate dischargeability (HRD) and peak power (P_peak) progressively decrease with Ni, Si, Cu, Fe, Sn and Al substitution, but the cycling stability successively increases with Ni, Si, Fe, Sn, Cu and Al substitution. Based on the thermodynamics and the coordination of the LTD, the HRD and P_peak with the cycling life, the (LaCe)_1.0(NiCoMn)_4.85Al_0.05Cu_0.1 alloy presents the best overall electrochemical properties. Notably, when using an as-designed Cu-doped anode, the assembled commercial 100 Ah prismatic Ni-MH batteries present excellent power delivery at −40 °C.

尽管低铝或无铝设计是开发低温高速率金属氢化物合金的有效方法，但这些合金的循环寿命很差。我们的策略是采用B侧防腐元素（例如，Fe，Si，Sn，Cu）来协调低温和大功率输送与循环寿命。我们证实，优异的电化学动力学（即表面催化和大量H扩散能力）是低温和高速率输送的主要条件，而其具有抗腐蚀能力则可以逆转。结果是低温放电率（LTD），高速率放电率（HRD）和峰值功率（P _peak）随着Ni，Si，Cu，Fe，Sn和Al的取代逐渐降低，但循环稳定性随着Ni，Si，Fe，Sn，Cu和Al的取代而依次增加。基于热力学和LTD的配位，HRD和P_峰与循环寿命的关系，（LaCe）_1.0（NiCoMn）_4.85 Al _0.05 Cu _0.1合金具有最佳的整体电化学性能。值得注意的是，当使用设计为Cu掺杂的阳极时，组装好的商用100 Ah方形Ni-MH电池在−40°C时表现出出色的功率传输。