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每周分享：Facile preparation of core@shell and concentration-gradient spinel particles for Li-ion battery cathode materials

今天給大家分享的是2015年2月份 《Science and Technology of Advanced Materials》上發(fā)表的一篇名為：Facile preparation of core@shell and concentration-gradient spinel particles for Li-ion battery cathode materials

文章摘要如下：

Core@shell and concentration-gradient particles have attracted much attention as improved cathodes for Li-ion batteries (LIBs). However, most of their preparation routes have employed a precisely-controlled co-precipitation method. Here, we report a facile preparation route of core@shell and concentration-gradient spinel particles by dry powder processing. The core@shell particles composed of the MnO₂ core and the Li(Ni,Mn)₂O₄ spinel shell are prepared by mechanical treatment using an attrition-type mill, whereas the concentration-gradient spinel particles with an average composition of LiNi_0.32Mn_1.68O₄ are produced by calcination of their core@shell particles as a precursor. The concentration-gradient LiNi_0.32Mn_1.68O₄ spinel cathode exhibits the high discharge capacity of 135.3 mA h g^?1, the wide-range plateau at a high voltage of 4.7 V and the cyclability with a capacity retention of 99.4% after 20 cycles. Thus, the facile preparation route of the core@shell and concentration-gradient particles may provide a new opportunity for the discovery and investigation of functional materials as well as for the cathode materials for LIBs.

該文章中材料表征采用的是美國麥克儀器3Flex

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