用流变相法制备了ZnO修饰Fe1.5P电极材料, 用X射线衍射仪对产物进行成分分析, 用透射电镜表征形貌, 用恒流充放电法、循环伏安法和电化学阻抗谱法研究了ZnO修饰对Fe1.5P电化学性能的影响. 实验结果表明: ZnO修饰能够提高Fe1.5P的倍率特性, 使Fe1.5P的首次放电容量提高~69.7％, 达到837.5 mAh/g, 经过215次循环后, 将Fe1.5P在12 C倍率下的放电容量提高~144.3%, 而且将Fe1.5P在0.1 C倍率下的恢复放电容量提高~330％; 另外, ZnO修饰Fe1.5P的SEI膜阻抗RSEI、电荷传递阻抗Rd和Li+扩散的Warburg阻抗Wb分别降低~87.9％、~87％和~13.2％, 将锂离子扩散系数提高~86.6%.
ZnO-modified Fe1.5P powders were synthesized successfully via a rheological phase method. X-ray diffractometry (XRD) was utilized to analyze the composition. TEM was used to characterize the morphology. The effects of ZnO modification on the electrochemical performance of the Fe1.5P were investigated using constant current charge/discharge method, cyclic voltammogram, and electrochemical impedance spectrograph (EIS). The experimental results show that ZnO modification can enhance the rate performance of Fe1.5P. The first discharge capacity of the ZnO-modified Fe1.5P is 837.5mAh/g, and 69.7% higher than that of the pristine Fe1.5P. After 215 cycles, the discharge capacity of the Fe1.5P at 12C rate is increased to 144.3%. Furthermore, ZnO modification improve 330% of the recovery discharge capability of the Fe1.5P at 0.1C rate. In addition, in comparison with the pristine Fe1.5P, ZnO modification reduce 87.9% of the SEIingd SEI film resistance RSEI, 87% of the charge transfer resistance Rd, and 13.2% of the Warburg impedance Wb from the diffusion of lithium ions, while can improve 86.6% of the diffusion efficiency of lithium ions.
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