Template-free synthesis of mesoporous hollow CuO microspheres as anode materials for Li-ion batteries.
Template-free synthesis of mesoporous hollow CuO microspheres as anode materials for Li-ion batteries.
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DOI：
10.1166/jnn.2013.5978
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发表时间：
2013-02
影响因子：
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通讯作者：
Zailei Zhang;H. Che;Jin Sun;X. She;Han Chen;F. Su
中科院分区：
文献类型：
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作者：
Zailei Zhang;H. Che;Jin Sun;X. She;Han Chen;F. Su
本文报道了以草酸铵与氯化铜反应合成的空心草酸铜微球为原料，采用热分解法制备中孔空心CuO微球，并对其性能进行了表征。通过氮吸附、x射线衍射、透射电镜和扫描电镜对样品进行了表征。对MPH-CuO微球作为锂离子电池负极材料的电化学性能进行了评价。结果表明，MPH-CuO微球的平均直径为2.5微米，孔径为17.5 nm， BET表面积为15.2 m2/g。它们的外壳由尺寸为17.9 nm的CuO纳米晶体组成。与致密CuO微球相比，所制得的MPH-CuO由于具有介孔中空结构，可快速插入和容纳较大的锂离子，且锂离子的扩散距离短，其电化学性能得到提高，达到599.4 mAh/g，循环15次后可循环484 mAh/g，具有潜在的应用前景。
We report the preparation and characterization of mesoporous hollow CuO (MPH-CuO) microspheres by thermal decomposition of hollow copper oxalate microspheres synthesized via the reaction of ammonium oxalate and copper chloride without using any template. The sample was characterized by Nitrogen adsorption, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. The electrochemical performance of MPH-CuO microspheres as anode materials in Li-ion batteries was evaluated. It was found that the MPH-CuO microspheres possessed an average diameter of 2.5 microm, a pore size of 17.5 nm, and a BET surface area of 15.2 m2/g. Their shells were composed of CuO nanocrystals with a size of 17.9 nm. Compared with the dense CuO microspheres, the obtained MPH-CuO shows an enhanced electrochemical performance with a higher capacity of 599.4 mAh/g and a better cyclability (484 mAh/g after 15 cycles) because of its mesoporous hollow structure that provides quick intercalation and large accommodation of lithium ions together with short diffusion distance for lithium ions, suggesting a potential application in Li-ion batteries.