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Surfactant-assisted solvothermal synthesis of NiCo2O4 as an anode for lithium-ion batteries

机译：表面活性剂辅助溶剂热合成NiCo 2 O 4 作为锂离子电池的阳极

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Binary metal oxides have been considered as promising anode materials, which exhibit much better performances than single metal oxides in view of their variable oxidation state and fairly high electrical conductivity. In this research, NiCo2O4 nanocrystals are prepared from a facile procedure including microemulsion-solvothermal reaction and subsequent calcination at 400?°C for 4 hours. The as-prepared NiCo2O4 nanocrystals are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). When applied as an anode for a lithium ion battery, it demonstrates excellent cycling and rate stability. The initial charge/discharge efficiency is as high as 75.41% at a current density of 100 mA g?1. After 45 cycles, the discharge capacity still retains up to 1175.9 mA h g?1, which is even much higher than that of the initial discharge capacity. Meanwhile, the reversible capacity remains over 644.9 mA h g?1 at a large current density of 1600 mA g?1, ascribed to the dispersed nanoparticles, which will help to improve the conductivity of the electrode material during the lithium-ion insertion/deintercalation process, shorten the ion diffusion path and reduce the charge transfer resistance (Rct).
机译：二元金属氧化物已经被认为是有前途的阳极材料，鉴于其可变的氧化态和相当高的电导率，其表现出比单金属氧化物更好的性能。在这项研究中，NiCo 2 O 4 纳米晶体是通过包括微乳液-溶剂热反应和后续步骤的简便程序制备的在400℃下煅烧4小时。制备的NiCo 2 O 4 纳米晶体通过X射线衍射（XRD）表征，场强发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM）和X射线光电子能谱（XPS）。当用作锂离子电池的负极时，它具有出色的循环和速率稳定性。在电流密度为100 mA g ？1 时，初始充电/放电效率高达75.41％。经过45个循环，放电容量仍保持高达1175.9 mA h g ？1 ，甚至比初始放电容量还要高。同时，在1600 mA g ？1 ？1 以上>，归因于分散的纳米颗粒，这将有助于改善锂离子插入/脱嵌过程中电极材料的电导率，缩短离子扩散路径并降低电荷转移阻力（ R < small> ct ）。

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