材料科学
阴极
水溶液
碳纳米管
化学工程
电化学
煅烧
锰
复合数
碳纤维
电导率
电池(电)
无机化学
纳米技术
复合材料
冶金
催化作用
电极
有机化学
化学
功率(物理)
物理化学
工程类
物理
量子力学
作者
Dandan Jia,Zewen Yang,Wen Gu,Xin Liu
标识
DOI:10.1016/j.jallcom.2022.164876
摘要
Aqueous zinc-ion batteries (ZIBs) have received widespread attention due to their high specific capacity (820 mA h g−1), high safety and low cost. Manganese (Mn)-based oxides show great potential as cathode materials for aqueous ZIBs, but they also face problems of low conductivity and poor rate performance. The introduction of carbon nanotubes (CNTs) can improve the hydrophilicity, enhance the conductivity of Mn-based oxides, and further improve the cycling performances of the ZIBs at high current density. Therefore, in this paper, Mn-based metal-organic-framework (Mn-MOF) is chosen as a template, while carboxylic CNTs are introduced during the synthesis process of Mn-MOF, finally after further calcination, composite material of Mn-based oxides, MOF-derived carbon and CNTs (MnOx@[email protected]) is prepared as the cathode for aqueous ZIBs. After 5000 cycles at a current density of 3 A g−1, the capacity retains 96.7 mA h g−1, while the capacity decay rate is 2% only. This work provides a solution to the challenges of Mn-based oxides for aqueous ZIBs cathode, thus achieve better electrochemical performances.
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