Abstract
In order to modify the electrochemical characteristics of low-Co AB 5-type electrode alloy, the low-Co AB 5-type Mm(NiCoMnAl) 5B x ( x=0, 0.1, 0.2, 0.3, 0.4) electrode alloys were quenched by melt-spinning. The phase structure and microstructure morphologies of the as-cast and quenched alloys were analysed and examined by XRD and SEM. The effects of rapid quenching on the microstructures and the electrochemical characteristics of low-Co AB 5-type electrode alloys were investigated in detail. The obtained results showed that the as-quenched alloys have an excellent activation performance and can be activated through 2–5 charge–discharge cycles. Rapid quenching can enhance the discharge capacity of the alloys in a certain range of quenching rate. The discharge capacity of the as-quenched alloy was lower than that of the as-cast alloy when the quenching rate is higher than some critical value. The critical quenching rate depends on the compositions of the alloys. The cycle life of the alloys monotonously increased with increasing of quenching rate.
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