锌离子电池正极材料<i>δ</i>-MnO<sub>2</sub>@氮掺杂碳纳米片阵列的构筑与电化学性能

锌离子电池正极材料δ-MnO₂@氮掺杂碳纳米片阵列的构筑与电化学性能

摘要: 为了解决二氧化锰电极电导率低的问题，通过在生长有金属有机骨架衍生的氮掺杂碳纳米片阵列(CC@CN)上生长超薄MnO₂片，制备了一种新型δ-MnO₂@氮掺杂碳纳米片阵列(CC@CN@MnO₂)，此种独特的结构可提高电极的电导率，超薄的MnO₂纳米片可提供短的电子/离子扩散路径。利用扫描电镜对材料进行形貌分析，采用恒流充放电测试了材料的电化学性能。实验结果表明，Zn//CC@CN@MnO₂电池表现出了高容量和高倍率性能，在100 mA/g的电流密度下，达到了310.5 mA·h/g的比容量，在5 A/g的大电流密度下，放电比容量仍有115.6 mA·h/g。

Abstract: To solve the problem of low conductivity of manganese dioxide electrode, a novel array cathode material was prepared by anchoring ultrathin MnO₂nanosheets on metal organic framework-derived N-doped carbon nanowall array grown on carbon cloth (CC@CN@MnO₂). The unique 2D substrate enables to improve the conductivity, furthermore, the ultrathin MnO₂nanosheets can provide shortened electronic/ion diffusion paths. The morphology of the material were analyzed by SEM. The electrochemical characteristics of the material were investigated by galvanostatic charge-discharge test. The results show that Zn//CC@CN@MnO₂ battery delivers admire capacity of 310.5 mA·h/g at 100 mA/g, superior rate capability of 115.6 mA·h/g at 5 A/g.