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Effect of copper doping on LiMnPO_4 prepared via hydrothermal route

机译:铜掺杂对水热法制备LiMnPO_4的影响

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摘要

Fine-sized, well-crystallized LiMnPO_4 and two Cu-doped derivatives (2% and 5% Cu~(2+) doping) are readily prepared via a hydrothermal route. X-ray diffraction (XRD) combined with structural analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area analysis, and galvanostatic charge-discharge tests are applied to characterize these materials. The structure analysis shows that only a negligible amount of Cu~(2+) ions (0.2%) occupy the Li sites in the 2% Cu-doped material, while a considerable amount of Cu~(2+) ions (1.8%) occupy the Li sites in the 5% Cu-doped one. The electrochemical tests show that the 2% Cu-doped LiMnPO_4 displays an improved electrochemical performance compared with the undoped LiMnPO_4, while the 5% Cu-doped LiMnPO_4 exhibits a decreased activity.
机译:通过水热法可以很容易地制备出细小,结晶良好的LiMnPO_4和两种Cu掺杂的衍生物(掺杂2%和5%的Cu〜(2+))。 X射线衍射(XRD)与结构分析,扫描电子显微镜(SEM),透射电子显微镜(TEM),比表面积分析和恒电流充放电测试相结合来表征这些材料。结构分析表明,在2%的Cu掺杂材料中,只有极少量的Cu〜(2+)离子(0.2%)占据了Li位,而相当数量的Cu〜(2+)离子(1.8%)在5%的Cu掺杂中占据Li位。电化学测试表明,与未掺杂的LiMnPO_4相比,掺杂2%的Cu的LiMnPO_4表现出改善的电化学性能,而掺杂5%的Cu的LiMnPO_4的活性下降。

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