 Abstract-layered vanadium-based oxide cathodes are promising candidates for aqueous-sink ion batteries, azibs. In this paper, an in-situ electrochemical method was used to control the interlayer spacing of these oxides, which improved their performance significantly. The results showed that increasing the cutoff voltage from 1.4V to 1.8V increased the interlayer spacing of the oxide from 9.5A to 12.08A, resulting in higher capacities and longer cycle life. The cathode with the highest capacity of 223 mAh per G at 10A slash G and longest cycle life of 97.5% after 1000 cycles was achieved when the oxide was charged to 1.6V. Additionally, the NH4-plus storage performance of the oxide reached 296 mAh per G at 0.1A slash G and 3000 cycles at 5A slash G. These findings suggest that controlling the interlayer spacing of layered oxides is key to achieving high performance in azibs. This article was authored by Shuyu Li, Dong Shuyu, Jin Yi Lu, and others.