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Experimental work was carried out to explore the possibility of using filamentary Ni powder to enhance the rate capability and reduce the usage of cobalt in pasted Ni͑OH) 2 electrodes for high-drain-rate application. Testing results showed that an extra fine filamentary nickel powder, type 210, as an additive significantly improved the active mass utilization, gravimetric capacity, and volumetric capacity of pasted Ni͑OH) 2 electrodes at high rates. In addition, the performance gain could be achieved in thicker electrodes using reduced Co content. Coarser filamentary Ni powder, type 255, was also found effective but in a lesser degree than type 210. The major contribution of a filamentary Ni powder was believed to be enhancement of conductivity by means of a secondary conductive network in the active mass within the Ni foam cells, equivalent to a reduction in Ni foam cell size.

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