ZnFe2O4锂离子电池负极材料的制备及电化学性能研究

doi:10.15541/jim20150272

摘要/Abstract

摘要：

以ZnCl₂和FeCl₃.6H₂O为原料, 通过溶剂热法制备了尖晶石型ZnFe₂O₄材料, 通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅立叶红外光谱(FT-IR)和恒流充放电测试技术对材料的结构、形貌及电化学性能进行了表征。结果表明, 合成的材料为纳微多孔结构, 其颗粒粒径约为250 nm, 以50 mA/g的电流密度充放电时, 可逆比容量为933.1 mAh/g, 经过100次循环后, 比容量为813.5 mAh/g, 比容量保持率高达87.2%, 表现出优异的循环稳定性能。当电流密度增大到400 mA/g时, 其比容量约为355 mAh/g, 表现出较高的倍率性能。采用该法制备得到的纳米ZnFe₂O₄具有比容量高、循环稳定好等优点, 是一种具有较强应用前景的锂离子电池负极材料。

关键词: 铁酸锌, 锂离子电池, 纳米材料

Abstract:

ZnFe₂O₄ materials with spinel structure were synthesized from ZnCl₂ and FeCl₃.6H₂O by solvothermal method. Crystal structure and surface morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fourier transform infrared spectrum (FT-IR). Electrochemical performance was analyzed by constant current charging-discharging technique and cyclic voltammetry. The results showed that the particle size was about 250 nm. As an active material for lithium-ion batteries, the nano ZnFe₂O₄ material delivered a reversible capacity of 933.1 mAh/g at a current density of 50 mA/g. The specific charge capacity slightly decreased to 813.5 mAh/g, with a retention of 87.2% after 100 cycles. Furthermore, the material was able to release a capacity of 355 mAh/g at a current density as high as 400 mA/g, which demonstrated reasonable rate performance and moderately fast charge/discharge capabilities. Data from this study indicated that ZnFe₂O₄ nano-material prepared by solvothermal method is a promising anode material for lithium-ion battery with high capacity and superior cycling stability.

Key words: zinc ferrite, lithium-ion battery, nano material

中图分类号:

TB332

廖丽霞, 王明, 方涛, 尹鸽平, 周晓光, 娄帅锋. ZnFe₂O₄锂离子电池负极材料的制备及电化学性能研究[J]. 无机材料学报, 2016, 31(1): 34-38.

LIAO Li-Xia, WANG Ming, FANG Tao, YIN Ge-Ping, ZHOU Xiao-Guang, LOU Shuai-Feng. Synthesis and Characterization of ZnFe₂O₄ Anode for Lithium Ion Battery[J]. Journal of Inorganic Materials, 2016, 31(1): 34-38.

图/表 8

图1 ZnFe2O4材料的XRD图谱

Fig. 1 XRD pattern of ZnFe2O4

图2 ZnFe2O4材料的红外光谱图

Fig. 2 FTIR spectrum of ZnFe2O4 nanoparticle

图3 ZnFe2O4的低倍SEM照片(a)及高倍SEM照片(b)和TEM照片(c)

Fig. 3 SEM images of low- (a) and high- (b) magnification and TEM image (c) of ZnFe2O4

图4 ZnFe2O4的N2等温吸附脱附曲线

Fig. 4 N2 adsorption/desorption isotherms of ZnFe2O4

图5 ZnFe2O4电极的恒流充放电曲线

Fig. 5 Charge-discharge curve of the constant current

图6 ZnFe2O4电极的循环伏安图

Fig. 6 Cycling voltammgram of ZnFe2O4 electrode

图7 ZnFe2O4电极的循环性能图

Fig. 7 Cycling performance of ZnFe2O4 electrode

图8 ZnFe2O4电极的倍率性能图

Fig. 8 Rate performance of ZnFe2O4 electrode

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ZnFe₂O₄锂离子电池负极材料的制备及电化学性能研究

Synthesis and Characterization of ZnFe₂O₄ Anode for Lithium Ion Battery

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