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Li-ion storage in morphology tailored porous hollow Cu2O nanospheres fabricated by Ostwald ripening

机译：锂离子贮藏在形态学中量身定制的多孔空心Cu2O纳米纳米纳米纳米·成熟

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摘要

Uniform Cu2O nanospheres with tailored hollow structure are successfully synthesized by employing the Ostwald ripening approach, and used as anodes in Li-ion battery. The synthesis involved a facile room-temperature chemical reaction of cupric nitrate with hydrazine. Hydrazine served as an alkali and reducing agent, converting Cu2+ to Cu2O nanoparticles, which self-assembled due to their large interfacial energy and formed 100-400 nm nanospheres. The Cu2O nanospheres were characterized by SEM, TEM, XRD, UV-vis spectroscopy and BET techniques. These Cu2O nanospheres were comprised of a mesoporous shell (20-50 nm) and a hollow interior part (50-100 nm). Galvanostatic charge-discharge measurements at different current densities, slow scan cyclic voltammetry (CV) and impedance measurements were used to analyze the electrochemical performance of the Cu2O nanospheres. The hollow Cu2O nanospheres exhibited a capacity of similar to 650 mA h g(-1) at 100 mA g(-1) current density, showing greater than 80% capacity retention after 100 cycles. The enhanced electrode performance is attributed to the mesoporous hollow nanostructure that ensured an increased number of electrochemical sites, shorter Li ion diffusion lengths facilitating fast electrochemical kinetics, and sufficient void spaces to buffer the volume expansion.
机译：通过采用Ostwald成熟方法成功合成具有定制中空结构的均匀Cu2O纳米球，并用作锂离子电池中的阳极。该合成涉及亚硝酸亚硝酸盐的容易室温化学反应。肼用作碱和还原剂，将Cu 2 +转化为Cu2O纳米颗粒，其由于其大的界面能量和形成100-400nm纳米球而自组装。 Cu 2 O纳米球的特征在于SEM，TEM，XRD，UV-Vis光谱和BET技术。这些Cu2O纳米球由介孔壳（20-50nm）和中空内部（50-100nm）组成。不同电流密度的电流电荷放电测量，慢扫循环伏安法（CV）和阻抗测量用于分析Cu2O纳米球的电化学性能。中空Cu 2 O纳米球在100mA g（-1）电流密度下表现出类似于650mA H（-1）的容量，显示在100次循环后的大于80％的容量保留。增强的电极性能归因于介孔中空纳米结构，其确保了电化学部位的数量增加，促进快速电化学动力学的较短LI离子扩散长度，以及足够的空隙空间来缓冲体积膨胀。

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  • 来源
    《RSC Advances》 |2016年第107期|共8页
  • 作者

    Shilpa; Rai Prabhakar; Sharma Ashutosh;

  • 作者单位

    Indian Inst Technol Kanpur Dept Chem Engn Kanpur 208016 Uttar Pradesh India;

    Indian Inst Technol Kanpur Dept Chem Engn Kanpur 208016 Uttar Pradesh India;

    Indian Inst Technol Kanpur Dept Chem Engn Kanpur 208016 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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