In this study, two compounds of TiNb₂O₇ and Ti₂Nb₁₀O₂₉ were successfully synthesized by mechanochemical method and post-annealing as an anode material for lithium-ion batteries. The effect of annealing atmosphere on the morphology, particle size, and electrochemical characteristics of two compounds was investigated. For these purposes, the reactive materials were milled under an argon atmosphere with a certain mole ratio. Subsequently, each sample was subjected to annealing treatment in two different atmospheres, namely argon and oxygen. Phase and morphology identifications were carried out by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) to identify the phases and evaluate the morphology of the synthesized samples. The charging and discharging tests were conducted using a battery-analyzing device to evaluate the electrochemical properties of the fabricated anodes. Annealing in different atmospheres resulted in variable discharge capacities so that the two compounds of TiNb₂O₇ and Ti₂Nb₁₀O₂₉ annealed under the argon atmosphere showed a capacity of 60 and 66 mAh/g after 179 cycles, respectively, which had a lower capacity than their counterpart under the oxygen atmosphere. The final capacity of the annealed samples in the oxygen atmosphere is 72 and 74 mAh/g, respectively.

中文翻译：

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不同退火气氛下TiNb2O7和Ti2Nb10O29阳极的合成及电化学性能

本研究采用 TiNb ₂ O ₇和 Ti ₂ Nb ₁₀ O ₂₉两种化合物通过机械化学方法和后退火成功合成锂离子电池负极材料。研究了退火气氛对两种化合物的形貌、粒径和电化学特性的影响。为了这些目的，在氩气气氛下以一定摩尔比研磨反应材料。随后，每个样品在两种不同的气氛中进行退火处理，即氩气和氧气。通过X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）进行物相和形貌鉴定，以鉴定合成样品的物相并评估其形貌。使用电池分析装置进行充电和放电测试以评估制造的阳极的电化学性能。在氩气氛下退火的₂ O ₇和 Ti ₂ Nb ₁₀ O ₂₉在 179 次循环后分别显示出 60 和 66 mAh/g 的容量，其容量低于氧气氛下的对应物。在氧气氛中退火样品的最终容量分别为 72 和 74 mAh/g。