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Hydrated Layered Vanadium Oxide as a Highly Reversible Cathode for Rechargeable Aqueous Zinc Batteries
Author(s) -
Zhang Ning,
Jia Ming,
Dong Yang,
Wang Yuanyuan,
Xu Jianzhong,
Liu Yongchang,
Jiao Lifang,
Cheng Fangyi
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201807331
Subject(s) - cathode , materials science , faraday efficiency , vanadium , electrochemistry , aqueous solution , chemical engineering , x ray photoelectron spectroscopy , battery (electricity) , zinc , intercalation (chemistry) , energy storage , vanadium oxide , electrode , inorganic chemistry , metallurgy , chemistry , power (physics) , physics , quantum mechanics , engineering
Rechargeable aqueous zinc batteries have gained considerable attention for large‐scale energy storage systems because of their low cost and high safety, but they suffer from limitations in cycling stability and energy density with advanced cathode materials. Here, a high‐performance V 5 O 12 ·6H 2 O (VOH) nanobelt cathode uniformly located on a stainless‐steel substrate via a facile electrodeposition technique is reported. We show that the hydrated layered VOH cathode enables highly reversible and ultrafast Zn 2+ cation (de)intercalation processes, as confirmed by various electrochemical, X‐ray diffraction, X‐ray photoelectron spectroscopy, and transmission electron microscopy analyses. It is demonstrated that the binder‐free VOH cathode can deliver a discharge capacity of 354.8 mAh g −1 at 0.5 A g −1 with a high initial Coulombic efficiency of 99.5%, a high energy density of 194 Wh kg −1 at 2100 W kg −1 , and a long cycle life with a capacity retention of 94% over 1000 cycles. In addition, a flexible quasi‐solid‐state Zn–VOH battery is constructed, achieving a reversible capacity of ≈300 mAh g −1 with a capacity retention of 96% after 50 cycles and displaying excellent electrochemical behaviors under different bending states. This work sheds light on the development of rechargeable aqueous zinc batteries for stationary grid storage applications or flexible energy storage devices.