Abstract
High electrochemical capacity of alkaline boride anodes is presented. The alkaline anodes based on transition metal borides (demonstrated with TaB, TaB 2, TiB 2 and VB 2) can deliver exceptionally high discharge capacity. Over 2000 and 3800 mAh g −1 discharge capacities are obtained for the commercially available TiB 2 and VB 2 respectively, much higher than the theoretical capacity of commonly used zinc metal (820 mAh g −1) alkaline anode. Coupling with the super-iron cathodes, the novel Fe 6+/B 2− battery chemistry generates a matched electrochemical potential to the conventional MnO 2–Zn battery, but sustains a much higher electrochemical capacity. High capacity TiB 2 and VB 2 anodes are further studied by coupling with a variety of cathodes (such as MnO 2, NiOOH, KIO 4 and composite K 2FeO 4/AgO). Both TiB 2 and VB 2 show good compatibilities with each of these cathodes. With the additive AgO to the super-iron (K 2FeO 4) cathode, a K 2FeO 4/AgO composite cathode TiB 2 anode alkaline battery exhibits high-rate discharge performance.
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