Amino-Functionalized Carbon Nanotubes Stimulating γ-MnO2 To Achieve High-Performance Zinc-Ion Batteries
Amino-Functionalized Carbon Nanotubes Stimulating γ-MnO2 To Achieve High-Performance Zinc-Ion Batteries
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DOI：
10.1016/j.electacta.2023.142461
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发表时间：
2023-04
影响因子：
6.6
通讯作者：
D. Du;Cong Huang;Jilei Liu;Xiaohua Chen;Geon-Wen Chang;Qun-li Tang;Aiping Hu
中科院分区：
文献类型：
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作者：
D. Du;Cong Huang;Jilei Liu;Xiaohua Chen;Geon-Wen Chang;Qun-li Tang;Aiping Hu
二氧化锰(MnO2)具有合适的工作电压和较高的容量，在水基锌离子电池正极材料中显示出很大的潜力。然而，其循环稳定性受到主体结构不稳定和不可避免的Mn2+溶解的严重限制。本文将氨基功能化碳纳米管(MWCNT-NH_2)引入到MWCNT-NH_2/γ-MnO_2纳米复合材料中，以显著提高γ-MnO_2的循环稳定性。一方面，MWCNTs-NH2可以通过均匀的三维力学网络和导电网络为γ-MnO2提供稳定的整体结构和良好的整体导电性。另一方面，MWCNTs-NH2的氨基参与了锌/氢离子的储存，最重要的是促进了Mn2+离子从电解液向阴极的沉积，从而抑制了活性物质在长期循环中的损失。在这些有利效应的推动下，NCM正极在0.2Ag−1下的超高容量为417.9 mAg−1，在3.0A g−1下的循环寿命超过3500次，容量保持率为91.4%。本研究揭示了促进锌锰电池中Mn2+沉积的重要性，并为实现MnO2正极的稳定循环提供了一种有效的策略。
With suitable operating voltage and high capacity, manganese dioxide (MnO2) shows great potential for the cathode of aqueous zinc ion batteries. However, its cycling stability is severely limited by the unstable host structure and inevitable dissolution of Mn2+. Herein, the amino-functionalized carbon nanotubes (MWCNTs-NH2) are introduced to construct the MWCNTs-NH2/γ-MnO2nanocomposite (NCM) to significantly stimulate the cyclic stability of γ-MnO2. On the one hand, MWCNTs-NH2can give impetus for stable integral structure and good overall electrical conductivity to γ-MnO2through homogeneous three-dimensional mechanical and conductive networks. On the other hand, the amino groups of MWCNTs-NH2can participate in the storage of Zn2+/H+and, most importantly, boost the deposition of Mn2+ions from the electrolyte to the cathode to inhibit the loss of active substance in the long-term cycle. Driven by these advantageous effects, the NCM cathode exhibits an ultra-high capacity of 417.9 mAh g−1at 0.2 A g−1and a long cycling life over 3500 cycles at 3.0 A g−1with 91.4% capacity retention. This study reveals the importance of promoting Mn2+deposition in Zn-MnO2batteries and presents an effective strategy for achieving stable cycling of MnO2cathodes.