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Carbon nanohorns/nanotubes: An effective binary conductive additive in the cathode of high energy-density zinc-ion rechargeable batteries
Carbon ( IF 10.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.carbon.2020.05.056
Yuan Huang , Zixuan Li , Shunyu Jin , Shengdong Zhang , Haolan Wang , Pritesh Hiralal , Gehan A.J. Amaratunga , Hang Zhou

Abstract Manganese oxide (MnO2) is proven to be an efficient cathode material in zinc-ion batteries (ZIBs). However, its poor electronic conductivity strongly limits the performance of Zn–MnO2 batteries. In order to improve performance beyond typical graphitic carbon additives, a binary conductive additive, a combination of carbon nanohorns (CNHs) and carbon nanotubes (CNTs), is added into the MnO2 electrode to establish high-speed electron-channels in the CNTs/CNHs network with an efficient “line-to-surface-to-point” microstructure. In this electrode, the high aspect-ratio CNTs create a conducting highway for the collected charges, while the CNHs provide extra surface area for electron transfer. Moreover, the specific surface area of the electrode increases due to the introduction of CNHs, which increases the Zn2+ diffusion coefficient. As a result, the corresponding battery reaches a high specific capacity (343 mAh g−1 at 0.3 A g−1), excellent rate performance (191.3 mAh g−1 at 3 A g−1) and long-life cycle. Moreover, it achieves an admirable specific energy density of 466 W h kg−1, together with a peak power density of 9.4 kW kg−1 (normalized to the weight of MnO2), the performance of which is among the best reported ZIBs. This work reveals new pathways to improve the performance of MnO2 cathodes for ZIBs.

中文翻译:

碳纳米角/纳米管:一种有效的二元导电添加剂,用于高能量密度锌离子可充电电池的阴极

摘要 氧化锰 (MnO2) 已被证明是锌离子电池 (ZIBs) 的有效正极材料。然而,其较差的电子导电性极大地限制了 Zn-MnO2 电池的性能。为了提高典型石墨碳添加剂的性能,将碳纳米角 (CNH) 和碳纳米管 (CNT) 组合的二元导电添加剂添加到 MnO2 电极中,以在 CNT/CNH 中建立高速电子通道具有高效的“线对表面对点”微结构的网络。在这个电极中,高纵横比的 CNT 为收集的电荷创造了一条导电高速公路,而 CNH 为电子转移提供了额外的表面积。此外,由于引入了 CNHs,电极的比表面积增加,这增加了 Zn2+ 扩散系数。结果,相应的电池达到了高比容量(0.3 A g-1 时为 343 mAh g-1)、优异的倍率性能(3 A g-1 时为 191.3 mAh g-1)和长寿命循环。此外,它实现了令人赞叹的 466 W h kg-1 比能量密度,以及 9.4 kW kg-1 的峰值功率密度(归一化为 MnO2 的重量),其性能是报道最好的 ZIB 之一。这项工作揭示了提高 ZIBs MnO2 阴极性能的新途径。其性能是报告最好的 ZIB 之一。这项工作揭示了提高 ZIBs MnO2 阴极性能的新途径。其性能是报告最好的 ZIB 之一。这项工作揭示了提高 ZIBs MnO2 阴极性能的新途径。
更新日期:2020-10-01
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