Achieving high performance in aqueous iron-ion batteries using tunnel-like VO₂ as a cathode material

Abstract

The research on aqueous iron-ion batteries (AIIBs) is still in its early stage and highly limited by the lack of suitable cathode materials. In this study, we propose using tunnel-like...

Rechargeable iron-ion (Fe-ion) batteries: recent progress, challenges, and perspectives

“…The ex situ measurement of the VO 2 electrodes was also done at various charge and discharge states, showing no phase transformation during cycling. 101 Thus, the overall findings suggest the high electrochemical performance of the vanadium oxides (V 2 O 5 & VO 2 ) cathodes, where V 2 O 5 is more favorable for the diffusive and VO 2 is more favorable for the capacitive process in non-aqueous and aqueous electrolytes, respectively.…”

“…3(h). The operating charging–discharging voltage window is also important due to the polarization of the iron electrode, which is theoretically limited to 0–1.21 V. 101 All the explored aqueous electrolytes for Fe-ion batteries are also summarized in Table 2 with the respective electrodes and electrochemical performance.…”