LAUSR

Aqueous Zn-ion batteries (ZIBs) with the advantages of low cost, high safety as well as high capacity, hold a broad application prospect in grid energy storage and wearable flexible devices. However, its commercial application is still restricted due to the inferior long-term cycling stability, Zn dendrite generation, the decomposition of aqueous electrolyte and so on. In terms of above issues, here we contruct a new type of Zn|Zn(CF 3 SO 3 ) 2 +LiTFSI|V 2 O 3 @C cell. Cathode V 2 O 3 can be fully oxidated into amorphous V 2 O 5 simultaneously with Zn 2+ and H 2 O co-insertion. The cell is able to deliver a high specific capacity of more than 240 mAh g -1 at 3 A g -1 with extraordinal coulombic efficiency and capacity retention. The excellent elctrochemical performances are attributed to the synergistic effect between V 2 O 3 @C electrode with enhanced stability and the improved interface reaction kinetics of the electrode in water-in-salt electrolyte. Systematically improvement of this architecture indicates a promising practical application prospect.