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Regulation of Breathing CuO Nanoarray Electrodes for Enhanced Electrochemical Sodium Storage

机译：呼吸式CuO纳米阵列电极对增强电化学钠存储的调节

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摘要

Cupric oxide (CuO) represents an attractive anode material for sodium-ion batteries owing to its large capacity (674 mAh g(-1)) associated with multiple electron transfer. However, the substantial volume swelling and shrinking (approximate to 170%) upon Na uptake and release, which mimics an electrode breathing process, disturbs the structural integrity, leading to poor electrochemical durability and low Coulombic efficiency. Here, a structural strategy to regulate the breathing of CuO nanoarray electrodes during Na cycling using an atomic layer deposition of cohesive TiO2 thin films is presented. CuO nanoarrays are electrochemically grown on 3D Cu foam and directly used as anodes for sodium storage. The regulated CuO electrode arrays enable a large reversible capacity (592 mAh g(-1)), a high cycle efficiency (approximate to 100%), and an excellent cycling stability (82% over 1000 cycles), which are some of the best sodium storage performance values reported for CuO systems. Electrochemical impedance and microscopic examination reveal that the enhanced performance is a direct outcome of the efficient regulation of the breathing of CuO nanowires by TiO2 layer.
机译：氧化铜（CuO）代表着钠离子电池的一种有吸引力的阳极材料，因为它具有与多次电子转移相关的大容量（674 mAh g（-1））。然而，Na的吸收和释放时大量的体积溶胀和收缩（约170％），这模仿了电极的呼吸过程，干扰了结构的完整性，导致较差的电化学耐久性和低库仑效率。在这里，提出了一种结构策略，用于调节在Na循环过程中使用粘性TiO2薄膜的原子层沉积来调节CuO纳米阵列电极的呼吸。 CuO纳米阵列在3D Cu泡沫上电化学生长，并直接用作钠存储的阳极。调节后的CuO电极阵列可实现大可逆容量（592 mAh g（-1）），高循环效率（大约100％）和出色的循环稳定性（1000次循环中有82％），这是最好的报道了CuO系统的钠存储性能值。电化学阻抗和显微镜检查表明，增强的性能是TiO2层有效调节CuO纳米线呼吸的直接结果。

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  • 来源
    《Advanced Functional Materials》 |2018年第15期|1707179.1-1707179.7|共7页
  • 作者

    Ni Jiangfeng; Jiang Yu; Wu Feixiang; Maier Joachim; Yu Yan; Li Liang;

  • 作者单位

    Soochow Univ, CECMP, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, CECMP, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany;

    Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany;

    Univ Sci & Technol China, Dept Mat Sci & Engn, Chinese Acad Sci, Key Lab Mat Energy Convers, Hefei 230026, Anhui, Peoples R China;

    Soochow Univ, CECMP, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    cupric oxide; electrochemical performance; nanoarrays; sodium-ion batteries;

    机译：氧化铜;电化学性能;纳米阵列;钠离子电池;

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