| 酸洗处理对NaEuTiO4的结构、形貌以及电化学性能影响 |
| Effect of Pickling Treatment on Structure, Morphology and Electrochemical Performance of NaEuTiO4 |
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| 摘要: 采用溶胶-凝胶法合成了具有层状钙钛矿结构的NaEuTiO4（NETO），并利用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、循环伏安（CV）和充放电循环测试等方法对用稀硝酸溶液酸洗处理后的NETO在结构、形貌和电化学性能方面的变化做了表征。研究结果表明，对于NETO而言，除了文献报道的Na+→Li+离子交换路径外，还存在着Na+→H+→Li+的离子交换路径，即NETO中的Na+可以跟稀酸中的H+发生离子交换。交换后得到的化合物HEuTiO4可以在电池中通过电化学反应的方式转化为LiEuTiO4。通过这样的路径得到的LETO具有相同优异的电化学性能，其中酸洗12 h的NETO具有最佳的电化学性能，经过300次循环后，其可逆容量约为213.2 mAh·g-1，而且表现出良好的倍率性能。 |
| 关键词: 锂离子电池 负极材料 稀土 钛基 酸洗 |
| 基金项目: |
| Abstract: NaEuTiO4 (NETO) with layered perovskite structure was synthesized by sol-gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammogram (CV) and charge-discharge test were used to characterize its structural, morphological and electrochemical properties of the NETO treated with dilute nitric acid. The results show that there was an ion exchange path of Na+→H+→Li+ for NETO beside the reported Na+→Li+ path. That is to say, Na+ could be exchanged with H+ in dilute acid to form HETO. Then HETO could transform to LETO by means of charge-discharge cycling. The LETO obtained by this route also had an excellent electrochemical performance. NETO-12 h showed the best electrochemical properties with the reversible capacity of about 213.2 mAh·g-1 after 300 cycles. Moreover, it exhibited a good rate capability. |
| Keywords: lithium-ion battery anode material rare earth titanium based pickling |
| 投稿时间：2020-03-08 修订日期：2020-06-25 |
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| 朱德澄,陈亦新,季崇星,朱贤雨,李德成.酸洗处理对NaEuTiO4的结构、形貌以及电化学性能影响[J].无机化学学报,2020,36(9):1690-1700. |
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