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Simple synthesis of a double-shell hollow structured MnO2@TiO2 composite as an anode material for lithium ion batteries

机译:双壳空心结构MnO 2 @TiO 2 复合材料作为锂离子电池负极材料的简单合成

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A double-shell hollow structured MnO2@TiO2 anode material has been successfully synthesized through a two-step template method. The monodispersed carbon spheres synthesized through a hydrothermal method act as the templates. The inner part of the carbon template acts as a sacrificial template to form the void and the outer part of it plays the role of self-template to synthesize hollow MnO2 spheres. The composition, crystallinity, morphology, and valence state of the final product MnO2@TiO2 are characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical performances of the double-shell hollow structured MnO2@TiO2 anode material have been comprehensively improved. The specific capacity of the composite retains 802?mA h g?1 at the current rate of 200 mA g?1 after 200 cycles, and it can still retain about 400 mA h g?1 at a higher current rate of 1 A g?1. Finally, a more detailed charging/discharging process of MnO2 is proposed.
机译:通过两步法成功合成了双壳空心​​结构的MnO 2 @TiO 2 阳极材料模板方法。通过水热法合成的单分散碳球充当模板。碳模板的内部充当牺牲模板以形成空隙,碳模板的外部充当自模板的角色,以合成空心MnO 2 球体。用以下方法表征了最终产物MnO 2 @TiO 2 的组成,结晶度,形态和价态X射线衍射,扫描电子显微镜,透射电子显微镜和X射线光电子能谱。全面改善了双壳中空结构MnO 2 @TiO 2 阳极材料的电化学性能。复合材料的比容量在200 mA g ?1 ?1 > 200次循环后,它仍可以在1 A g ?1 ?1 > 。最后,提出了MnO 2 的更详细的充放电过程。

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