材料科学
阴极
法拉第效率
化学工程
电化学
扫描电子显微镜
多孔性
降水
离子
涂层
锌
图层(电子)
碳纤维
储能
纳米技术
电极
冶金
复合材料
化学
复合数
工程类
物理
物理化学
气象学
功率(物理)
有机化学
量子力学
作者
Xiaoyue Cao,Yuting Xu,Bo Yang,Hongzhi Lang,Zexiang Shen,Ning Wang,Xiao‐Feng Wang,Shenghan Wang,Chenglin Sun
标识
DOI:10.1016/j.jallcom.2021.162785
摘要
Zinc ion batteries (ZIBs) are newly emerging and widely attracted energy storage devices owing to its advantages of intrinsic safety and low-cost effectiveness. Herein, we reported a nanorod-like MnO2 cathode material composited with carbon and pyrrolic nitrogen by in-situ co-precipitation method at room temperature, which was used as ZIB cathode to deliver a high specific capacity of 339 mAh g−1 at 100 mA g−1 and a long cycle stability over 2000 cycles at 1000 mA g−1, resulting in the ultrahigh coulombic efficiencies approximate to 100%. The improved performance was attributed to the enhancement of structural stability and more zinc ion insertion sites after introducing the 2-methylimidazole (2-MI) coating layer. The phase transition of α-MnO2 @2-methylimidazole (α-MnO2 @2-MI) and the formation of more porous architecture could be the origin of the continuous capacity increasing in the initial several cycles, which was proved by the results of the ex-situ x-ray diffraction (XRD) and the scanning electronic microscope (SEM). This method can be a more realistic choice for the further commercial applications of low-cost and easily-accessed ZIBs with excellent electrochemical performance.
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