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Enhanced electrochemical performance of Li2NiTiO4 with micro-structural rearrangement via urea treatment

机译：通过尿素处理进行的微结构重排增强了Li2NiTiO4的电化学性能

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摘要

Nanosized Li2NiTiO4 (LNT) with a disordered rock salt structure has been prepared by the sol-gel method. To improve the electrochemical performance, LNT has been mixed with urea and sintered in N-2 atmosphere. The effects of different sintering temperatures in N-2 on the micro-structural and electrochemical performances have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N-2 adsorption-desorption isotherm, transmission electron microscopy (TEM) and charge-discharge test. The electrochemical results show that Li2NiTiO4 with urea treatment at 500 degrees C (U-LNT-500) has the best rate capability, the highest discharge capacity and the best cycle ability, indicating that the electrochemical performances of LNT could be remarkably improved by this treatment. It is interesting to note that the discharge capacity of U-LNT-500 at ambient temperature is almost as high as the discharge capacity of LNT at 50 degrees C. It is believed that the micro-structural changes, such as the increase of the specific surface area and the volume of pores as well as the local ordered structure in terms of atomic arrangement after urea treatment should account for the enhancement of LNT electrochemical performances.
机译：通过溶胶-凝胶法制备了具有无序岩盐结构的纳米Li2NiTiO4（LNT）。为了提高电化学性能，将LNT与尿素混合并在N-2气氛中烧结。通过X射线衍射（XRD），X射线光电子能谱（XPS），N-2吸附-脱附等温线，透射电子显微镜研究了N-2中不同烧结温度对显微组织和电化学性能的影响。 （TEM）和充放电测试。电化学结果表明，尿素在500℃（U-LNT-500）处理下的Li2NiTiO4具有最佳的倍率能力，最高的放电容量和最佳的循环能力，表明该处理可以显着提高LNT的电化学性能。 。有趣的是，U-LNT-500在环境温度下的放电容量几乎与LNT在50摄氏度下的放电容量一样高。据信，微观结构会发生变化，例如比表面积的增加。尿素处理后的表面积和孔的体积以及原子排列方面的局部有序结构应说明LNT电化学性能的提高。

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