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首页> 外文期刊>RSC Advances >Facile synthesis of porous Li-rich layered Li[Li0.2Mn0.534Ni0.133Co0.133]O-2 as high-performance cathode materials for Li-ion batteries
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Facile synthesis of porous Li-rich layered Li[Li0.2Mn0.534Ni0.133Co0.133]O-2 as high-performance cathode materials for Li-ion batteries

机译：易于合成的富锂多孔层状Li [Li0.2Mn0.534Ni0.133Co0.133] O-2作为锂离子电池的高性能正极材料

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摘要

Lithium-rich layered metal oxides have drawn much recent attention due to their high rechargeable capacity of 250-300 mA h g(-1). Herein, we report the synthesis of porous Li[Li0.2Mn0.534Ni0.133Co0.133]O-2 metal oxide powders using a facile polymer-thermolysis method. X-ray powder diffractometry (XRD) results show that a well-crystallized layered structure was obtained when the calcination temperatures reach 800 degrees C. Pores in the range of 100-200 nm are observed using scanning electron microscopy (SEM). The porous Li [Li0.2Mn0.534Ni0.133Co0.133]O-2 synthesized at 850 degrees C shows much superior electrochemical performance to the sample synthesized by the traditional coprecipitation-calcination method, with a high initial coulombic efficiency of 87% and initial discharge capacity of 245.4 mA h g(-1) at 15 mA g(-1) in the voltage window 2-4.6 V. A capacity retention of 81% was obtained after 300 cycles at 300 mA g(-1). The higher capacity and improved rate performance of porous Li[Li0.2Mn0.534Ni0.133Co0.133]O-2 can be predominantly attributed to enhanced Li+ intercalation kinetics resulting from the highly porous structure.
机译：富含锂的层状金属氧化物由于其250-300 mA h g（-1）的高可充电容量而备受关注。在这里，我们报道了一种使用简便的聚合物热解法合成多孔Li [Li0.2Mn0.534Ni0.133Co0.133] O-2金属氧化物粉末的方法。 X射线粉末衍射法（XRD）的结果表明，当煅烧温度达到800℃时，获得了良好结晶的层状结构。使用扫描电子显微镜（SEM）观察到孔在100-200nm范围内。在850℃下合成的多孔Li [Li0.2Mn0.534Ni0.133Co0.133] O-2具有优于传统共沉淀煅烧方法的电化学性能，且初始库仑效率高达87％在2-4.6 V电压窗口中，在15 mA g（-1）时的放电容量为245.4 mA hg（-1）。在300 mA g（-1）下进行300次循环后，容量保持率为81％。多孔Li [Li0.2Mn0.534Ni0.133Co0.133] O-2的较高容量和改进的速率性能主要归因于高度多孔结构导致的Li +嵌入动力学增强。

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