A high-performance and low-cost pasted nickel electrode made from a metal fiber substrate has been developed. The electrode is designed so that it exhibits active material utilization close to 100%, with an energy density as high as 170 mAh/g or 520 mAh/cm 3. This high active material utilization, even with a metal fiber substrate, which is a poor current collector compared with a conventional sintered nickel powder plaque, has been made possible by adding CoO which dissolves and precipitates on the surface of nickel hydroxide particles as [~-Co(OH)2 during standing and then is converted to CoOOH during the subsequent charging, which provides a good electrical path between the nickel hydroxide particles and the metal fiber substrate. Thus-formed CoOOH is not reduced in the subsequent discharges of the electrode and serves as a good current collector to ensure a high active material utilization throughout the life of the electrode.

It is demonstrated that high performance and low‐cost pasted nickel electrodes with an active material utilization close to 100% and an energy density of 170 mAh/g can be prepared from a metal fiber substrate pasted with Ni(OH)2 by addition of CoO.

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