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Dendrite‐Free Flexible Fiber‐Shaped Zn Battery with Long Cycle Life in Water and Air
Author(s) -
Guan Qun,
Li Yongpeng,
Bi Xuanxuan,
Yang Jie,
Zhou Jingwen,
Li Xuelian,
Cheng Jianli,
Wang Zhuanpei,
Wang Bin,
Lu Jun
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901434
Subject(s) - materials science , anode , dendrite (mathematics) , battery (electricity) , fiber , cathode , energy storage , electrochemistry , power density , nanowire , electrode , flexibility (engineering) , nanotechnology , chemical engineering , zinc , composite material , power (physics) , metallurgy , electrical engineering , chemistry , physics , geometry , mathematics , statistics , quantum mechanics , engineering
Fiber‐shaped aqueous rechargeable Zn batteries (FARZBs) show flexibility, good reliability, cost‐effectiveness, high energy/power densities, and high safety that have attracted increasing attention as promising energy storage devices for future wearable applications. However, the development of FARZB is limited by its poor cycling life and inferior charge–discharge performance, mainly suffering from zinc dendrite growth and increasing electrode irreversibility. In this work, dendrite‐free fiber‐shaped Zn//Co 3 O 4 rechargeable batteries with a long cycle life tested in water and air, are obtained via tuning the surface binding energy of Zn on the anode using the zincophilic N,O‐functional carbon fiber, as well as engineering the Co 3 O 4 cathode with a nanowire array structure. The fiber‐shaped Zn//Co 3 O 4 full battery demonstrates remarkable long cycle life in water and air with high energy density, impressive flexibility, and excellent waterproof ability (fully immersed and charged/discharged under water for more than 33 h for 3000 cycles with capacity retention of ≈80%). The reversible electrochemical mechanisms of the FARZBs, without obvious zinc dendrite deposits and structural change of Co 3 O 4 nanowires, are confirmed by a series of characterizations. These results demonstrate that the FARZBs are promising power sources for emerging wearable electronics.