Dual-ion battery (DIB) is an up-and-coming technology for the energy storage field. However, most of the current cathodes are still focused on the graphite hosts, which deliver a limited specific capacity. In this work, we demonstrated for the first time that HPO can be used as the charge carrier for NaV(PO) under an aqueous electrolyte, which enabled the V/V and V/V multielectron reactions in the NaV(PO) electrode. The fabricated aqueous DIB delivers a high average voltage of ∼0.75 V (vs Ag/AgCl) and a high capacity of 280.7 mA h g. Moreover, the formed V-based novel cathode exhibits a capacity of 170.2 mA h g in an organic sodium-ion battery. This study may open a new direction for fabricating high-voltage electrodes through the design of DIBs.
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