J. Cao, D.D. Zhang, Y.L. Yue, X. Wang, A. Srikhaow, C. Sriprachuabwong, A. Tuantranont, X.Y. Zhang*, Z.-S. Wu*, J.Q. Qin*

Chemical Engineering Journal, 2021, 426, 131893.

DOI: 10.1016/j.cej.2021.131893 [PDF]

Aqueous zinc-ion batteries (ZIBs) are recognized as the most pivotal competitor of lithium-ion batteries due to their abundant reserves, remarkable safety and affordable cost.However, the uncontrollable dendritic growth and extremely low utilization (<5%) of zinc metal anode severely limit the practicality and energy density of ZIBs. Herein, a novel rocking-chair ZIBs with excellent cycling stability and high energy density is developed via employing tungsten oxide/carbide (WO₃/WC) layered heterogeneous hybrid with strong-coupling effect as the intercalated anode and MnO₂/graphite cathode. Benefiting from the favorable interface energy and electronic coupling with prominent charge-transfer between WO₃and WC, the WO₃/WC//Zn batteries deliver admirable capacity of 164 mAh g^-1under 0.1 A g^-1with suitable Zn²⁺intercalated potential of0.43 V (vs.Zn²⁺/Zn), long-term cyclability with 90.2% after 1000 cycles under 1 A g^-1, andreversible Zn²⁺intercalation behavior. Consequently, the assembled WO₃/WC||MnO₂/graphite rocking-chair ZIBs offer excellent capacity of 74 mAh g^-1at 0.1 A g^-1, impressive cyclic stability (100% after 10000 cycles) and exceptional energy density of 86 Wh kg^-1, suppressing most of reported rocking‐chair ZIBs. Therefore, this research provides a novel insight for designing safe and high-efficient ZIBs.