Abstract
Alloys with composition of Ho 6Fe 23− x Co x ( x=0, 1, 3) were prepared and examined by X-ray diffraction technique and automatic battery testing instrument. The compounds Ho 6Fe 23− x Co x ( x=0, 1, 3) crystallized in cubic Th 6Mn 23-type structure with space group ▪ (No. 225). The electrochemical properties of these alloys such as discharge capacity, cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte. Substitution of small amounts of Co for Fe in Ho 6Fe 23− x Co x improved the activation, discharge capacity and the high rate dischargeability. The alloy with x=3 (Ho 6Fe 20Co 3) had better discharge capacity, HRD and plateau pressure at discharge current density of 150 mA/g.
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