Hydrothermal synthesis, self-assembly and electrochemical performance of 伪-Fe₂O₃ microspheres for lithium ion batteries

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• 作者：Hanfeng Liang ; Wei Chen ; Yiwen Yao ; Zhoucheng Wang ; ^{zcwang@xmu.edu.cn" class="auth_mail} ; Yong Yang
• 关键词：Hematite ; Self-assembly ; Electrochemical properties ; Lithium-ion battery
• 刊名：Ceramics International
• 出版年：August 2014
• 年：2014
• 卷：40
• 期：7
• 页码：10283-10290
• 全文大小：1951 K

文摘

In this paper, we report the hydrothermal synthesis, structural characterization and electrochemical properties of uniform 伪-Fe₂O₃ microspheres. In the synthetic procedure, the surfactant, sodium citrate, was found to be crucial to the formation of 伪-Fe₂O₃ microspheres. In addition, by simply varying the concentration of sodium citrate, cylindrical 伪-Fe₂O₃ microstructures could be readily obtained. On the basis of time-dependent experimental result, a possible formation mechanism of the 伪-Fe₂O₃ microspheres was proposed. The as-obtained 伪-Fe₂O₃ microspheres were then evaluated as an anode material for lithium ion batteries. And the result shows that the material exhibited an initial discharge capacity as high as 1453.4 mAh g⁻¹. After 50 cycles, the reversible discharge capacity was 489.5 mAh g⁻¹, which was much higher than that of commercial graphite. This work provides an additional strategy to prepare self-assembled structures with tailored morphology. And the results are helpful to further understand the mechanism of self-organization and expand the applications of iron oxide micromaterials.