Abstract
NH(4)V(4)O(10) (NVO) is considered a promising cathode material for aqueous zinc-ion batteries due to its high theoretical capacity. However, its practical application is limited by irreversible deamination, structural collapse, and sluggish reaction kinetics during cycling. Herein, K(+) and C(3)N(4) co-intercalated NVO (KNVO-C(3)N(4)) nanosheets with expanded interlayer spacing are synthesized for the first time to achieve high-rate, stable, and wide-temperature cathodes. Molecular dynamics and experimental results confirm that there is an optimal C(3)N(4) content to achieve higher reaction kinetics. The synergistic effect of K(+) and C(3)N(4) co-intercalation significantly reduces the electrostatic interaction between Zn(2+) and the [VO(n)] layer, improves the specific capacity and cycling stability. Consequently, the KNVO-C(3)N(4) electrode displays outstanding electrochemical performance at room temperature and under extreme environments. It exhibits excellent rate performance (228.4 mAh g(-1) at 20 A g(-1)), long-term cycling stability (174.2 mAh g(-1) after 10,000 cycles at 20 A g(-1)), and power/energy density (210.0 Wh kg(-1) at 14,200 W kg(-1)) at room temperature. Notably, it shows remarkable storage performance at - 20 °C (111.3 mAh g(-1) at 20 A g(-1)) and 60 °C (208.6 mAh g(-1) at 20 A g(-1)). This strategy offers a novel approach to developing high-performance cathodes capable of operating under extreme temperatures.