Hybrid device employing three-dimensional arrays of MnO in carbon nanosheets bridges battery-supercapacitor divide.
Hybrid device employing three-dimensional arrays of MnO in carbon nanosheets bridges battery-supercapacitor divide.
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DOI：
10.1021/nl500011d
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发表时间：
2014-03
期刊：
影响因子：
10.8
通讯作者：
Huanlei Wang;Zhanwei Xu;Zhi Li;K. Cui;Jia Ding;A. Kohandehghan;X. Tan;B. Zahiri;B. Olsen
中科院分区：
文献类型：
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作者：
Huanlei Wang;Zhanwei Xu;Zhi Li;K. Cui;Jia Ding;A. Kohandehghan;X. Tan;B. Zahiri;B. Olsen
如何将二次电池的能量与超级电容器的能量相结合是一个挑战。在本文中，我们创建了为此目的微调的电极，其由通过石墨烯样碳纳米片的3D阵列的孔表面终端（“3D-MnO/CNS”）机械锚定的MnO纳米微晶单层组成。生物质衍生的碳纳米片应提供优于性能优异的设计师纳米碳（例如石墨烯或碳纳米管）的合成成本优势。高Li存储容量通过本体转换和嵌入反应实现，而高速率通过稳定的20 nm尺度扩散距离保持。例如，在0.1 A g（-1）时达到1332 mAh g（-1），在5 A g（-1）时达到567 mAh g（-1），在20 A g（-1）时达到285 mAh g（-1），在500次循环时具有可忽略的退化。我们采用3D-MnO/CNS（阳极）和碳纳米片（阴极）来创建混合电容器，该混合电容器显示出所报道的最有前途的性能：基于活性材料，其在83 W kg（-1）下提供184 Wh kg（-1），在15 000 W kg（-1）下提供90 Wh kg（-1），在5000次循环后具有76%的容量保持率。
It is a challenge to meld the energy of secondary batteries with the power of supercapacitors. Herein, we created electrodes finely tuned for this purpose, consisting of a monolayer of MnO nanocrystallites mechanically anchored by pore-surface terminations of 3D arrays of graphene-like carbon nanosheets ("3D-MnO/CNS"). The biomass-derived carbon nanosheets should offer a synthesis cost advantage over comparably performing designer nanocarbons, such as graphene or carbon nanotubes. High Li storage capacity is achieved by bulk conversion and intercalation reactions, while high rates are maintained through stable ∼20 nm scale diffusion distances. For example, 1332 mAh g(-1) is reached at 0.1 A g(-1), 567 mAh g(-1) at 5 A g(-1), and 285 mAh g(-1) at 20 A g(-1) with negligible degradation at 500 cycles. We employed 3D-MnO/CNS (anode) and carbon nanosheets (cathode) to create a hybrid capacitor displaying among the most promising performances reported: based on the active materials, it delivers 184 Wh kg(-1) at 83 W kg(-1) and 90 Wh kg(-1) at 15 000 W kg(-1) with 76% capacity retention after 5000 cycles.