Abstract In this report, we synthesize a series of metal oxide hollow microspheres by adjusting the ratio of reactants, through a facial one-step hydrothermal treatment followed by annealing. The properties of as-prepared hollow microspheres are investigated to be applied as electrode for both lithium ion batteries (LIBs) and supercapacitors (SCs). The obtained NiCo2O4/NiO composite, with mesopores at the surface of hollow spheres, shows excellent electrochemical performances according to the cyclic voltammetry and impedance measurements. At a current density of 100 mA g−1, a large reversible capacity of 659 mAh g−1 was achieved for NiCo2O4/NiO after 100 cycles as the anode material of LIBs. As an electrode for SCs, NiCo2O4/NiO exhibits high electrochemical performances with a capacitance of 708.4 F g−1 at a current density of 1 A g−1 and a high retention about 94.3% after 10,000 cycles at 10 mA g−1. It was estimated to deliver a high energy density of 25.06 Wh kg−1 at a power density of 250 W kg−1. The outstanding electrochemical properties can be attributed to the synergistic effect of different metal oxides, and the special morphology of porous hollow microspheres, which has a high specific surface area to facilitate the soaking of electrolyte and fast Li+ diffusion, as well as offer accommodation for the volume change.

中文翻译：

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NiO改性NiCo2O4空心球在高性能锂离子电池和超级电容器中的应用

摘要 在本报告中，我们通过调整反应物的比例，通过面部一步水热处理和退火合成了一系列金属氧化物空心微球。研究了制备的空心微球的性质，以用作锂离子电池（LIB）和超级电容器（SC）的电极。根据循环伏安法和阻抗测量，获得的 NiCo2O4/NiO 复合材料在空心球表面具有中孔，显示出优异的电化学性能。在 100 mA g-1 的电流密度下，NiCo2O4/NiO 作为锂离子电池负极材料在 100 次循环后实现了 659 mAh g-1 的大可逆容量。作为 SCs 的电极，NiCo2O4/NiO 表现出很高的电化学性能，电容为 708。4 F g-1 在 1 A g-1 的电流密度下和在 10,000 次循环后在 10 mA g-1 下保持约 94.3% 的高保留率。据估计，在 250 W kg-1 的功率密度下可提供 25.06 Wh kg-1 的高能量密度。优异的电化学性能可归因于不同金属氧化物的协同作用，以及多孔空心微球的特殊形态，具有高比表面积有利于电解质的浸泡和快速的 Li+扩散，并为音量变化。