| 锂离子电池负极材料ZnMn2O4微米空心球的制备和电化学性能 | |
| The Synthesis and Electrochemical Performance of ZnMn2O4 Hollow Microspheres as Anode Material for Lithium-Ion Batteries | |
| 摘要: 通过溶剂热方法合成了ZnMn2O4微米空心球，并探讨了其形成机理。采用XRD，SEM，TEM等测试手段对产物的结构、形貌和组成进行了表征。实验结果表明，溶剂热反应条件如反应温度、反应介质对于产物的结构和形貌起着关键作用。在140 ℃，采用乙醇和水作为反应介质，反应6 h可以制备出直径约3 μm的ZnMn2O4微米空心球；当以乙醇为溶剂，反应6 h可以得到团聚的尺寸约250 nm的ZnMn2O4纳米颗粒。将所制备的ZnMn2O4微米空心球/纳米颗粒组装成锂扣式模拟电池，考察其电化学脱嵌锂性能。电化学测试结果显示，与ZnMn2O4纳米颗粒相比，空心结构的ZnMn2O4微米球具有较高的初始放电容量(1 335 mAh·g-1)和较好的倍率性能，有望作为锂离子电池的新型负极材料。 | |
| 关键词: 溶剂热合成 ZnMn2O4 微米空心球 电化学 | |
| 基金项目: | |
| Abstract: ZnMn2O4 hollow microspheres have been prepared via a template-free solvothermal method and their growth mechanism is discussed. The as-synthesized samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is found that the solvothermal reaction parameters such as the reaction temperature and reaction solvent have crucial effects on the structure and morphology of the samples. When the reaction was heated at 140 ℃ for 6 h, the ZnMn2O4 hollow microspheres with the diameter of about 3 μm were obtained in the mixed solvents of ethanol and water, whereas the aggregate ZnMn2O4 nanoparticles with the size of about 250 nm were achieved in the ethanol medium. The electrochemical properties of the as-synthesized samples as anode materials of lithium-ion batteries is also investigated. The results display that the unique ZnMn2O4 hollow microspheres exhibited higher initial discharge capacity and better rate capacity than that of the ZnMn2O4 nanoparticles, indicating its promising application as anode materials for Li-ion batteries. | |
| Keywords: solvothermal synthesis hollow spheres ZnMn2O4 electrochemistry | |
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| 王洪波,程方益,陶占良,梁 静,陈 军.锂离子电池负极材料ZnMn2O4微米空心球的制备和电化学性能[J].无机化学学报,2011,27(5):816-822. | |
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