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Interfacial Engineering Coupled Valence Tuning of MoO 3 Cathode for High‐Capacity and High‐Rate Fiber‐Shaped Zinc‐Ion Batteries
Author(s) -
Liu Yi,
Wang Jing,
Zeng Yinxiang,
Liu Jie,
Liu Xiaoqing,
Lu Xihong
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201907458
Subject(s) - materials science , cathode , electrochemistry , anode , electrolyte , coating , chemical engineering , battery (electricity) , aqueous solution , ion , conductivity , nanotechnology , electrode , electrical engineering , thermodynamics , power (physics) , chemistry , physics , quantum mechanics , engineering
Aqueous Zn‐ion batteries (ZIBs) have garnered the researchers' spotlight owing to its high safety, cost effectiveness, and high theoretical capacity of Zn anode. However, the availability of cathode materials for Zn ions storage is limited. With unique layered structure along the [010] direction, α‐MoO 3 holds great promise as a cathode material for ZIBs, but its intrinsically poor conductivity severely restricts the capacity and rate capability. To circumvent this issue, an efficient surface engineering strategy is proposed to significantly improve the electric conductivity, Zn ion diffusion rate, and cycling stability of the MoO 3 cathode for ZIBs, thus drastically promoting its electrochemical properties. With the synergetic effect of Al 2 O 3 coating and phosphating process, the constructed Zn//P‐MoO 3− x @Al 2 O 3 battery delivers impressive capacity of 257.7 mAh g −1 at 1 A g −1 and superior rate capability (57% capacity retention at 20 A g −1 ), dramatically surpassing the pristine Zn//MoO 3 battery (115.8 mAh g −1 ; 19.7%). More importantly, capitalized on polyvinyl alcohol gel electrolyte, an admirable capacity (19.2 mAh cm −3 ) as well as favorable energy density (14.4 mWh cm −3 ; 240 Wh kg −1 ) are both achieved by the fiber‐shaped quasi‐solid‐state ZIB. This work may be a great motivation for further research on molybdenum or other layered structure materials for high‐performance ZIBs.