材料科学
阴极
阳极
电化学
电解质
涂层
化学工程
电池(电)
水溶液
电导率
纳米技术
离子
电极
电气工程
热力学
物理
工程类
物理化学
功率(物理)
化学
量子力学
作者
Yi Liu,Jing Wang,Yinxiang Zeng,Jie Liu,Xiaoqing Liu,Xihong Lu
出处
期刊:Small
[Wiley]
日期:2020-02-18
卷期号:16 (11)
被引量:91
标识
DOI:10.1002/smll.201907458
摘要
Abstract 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.
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