海藻酸钠引导合成纳微复合结构ZnFe_2O_4及其在锂离子电池中的应用

Sodium Alginate Directed Synthesis of ZnFe_2O_4 with Micro-nano Structure and Its Performance in Lithium Ion Batteries

使用海藻酸钠作为结构导向剂,通过溶剂热法原位合成了不同形貌的含碳ZnFe_2O_4锂离子电池负极材料.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和拉曼(Raman)光谱等对复合材料的形貌和结构进行表征,通过恒电流充放电、循环伏安曲线(CV)和交流阻抗谱(EIS)等对复合材料的电化学性能进行了测试.结果表明,在不同形貌的复合材料中,具有类蒲公英状纳微复合结构的含碳ZnFe_2O_4的电化学性能最佳:在1000 mA/g的电流密度下循环100周后依然保持2100 mA·h/g的比容量.还探讨了海藻酸钠在材料形成和制作极片过程中的作用及其对电池性能的影响.

In the addition of Sodium alginate as a structure-directing agent,different micro-nano structures of anode materials ZnFe 2O 4/C were synthesized by the hydrothermal method.The structural and morphological properties were investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(SEM),transmission electron microscopy(TEM)and Raman spectroscopy(Raman).The electrochemical performance was examined by galvanostatic charge-discharge test,cyclic voltammograms and electrochemical impedance spectroscopy.The results indicate that dandelion-liked ZnFe 2O 4/C has a reversible capacity of 2100 mA·h/g after 100 cycles at 1000 mA/g.In addition,the role of sodium alginate and the effect of different structures on electrical performance have also been investigated.