Fe(Ⅵ/Ⅲ)薄膜电极制备条件的影响及电化学性能研究

采用电沉积法制备了Fe(Ⅵ/Ⅲ)薄膜电极,研究了制备条件的影响及其电化学性能.利用SEM、AES、循环伏安及恒流充放电等测试手段分析了Fe(Ⅵ/Ⅲ)薄膜的微观形貌及其电化学性能.结果表明,Fe(Ⅵ/Ⅲ)薄膜上有微小的针状颗粒;Fe(Ⅵ/Ⅲ)薄膜电极具有电化学活性,可以进行锂离子的嵌入与脱出;Fe(Ⅵ/Ⅲ)薄膜电极表现出初次充放电的高容量和高放电平台,初次循环后充放电容量运渐降低并稳定在一个相对低的数值.

Influence of Preparation Conditions on Thin Film Fe (Ⅵ/Ⅲ) Electrode and Study of Electrochemical Characters

The thin film Fe( Ⅵ/Ⅲ ) electrode is generated by electrodeposition. The influence of preparation conditions and the electrochemical characters are studied. The tests of SEM, AES, cyclic voltammetry and galvanostatic charge/discharge investigations are used to analyze the microstructure and electrochemical characters. The results of SEM show that there are minor needle grains on the surface of film. The results of CV and AES indicate that the thin film Fe(Ⅵ/Ⅲ) electrode is electrochemically activite, involving the lithiation and delithiation. The thin film Fe( Ⅵ/Ⅲ )electrode shows high capacity and discharging flat roof in the initial-cycle, and the capacity then fade from cycle to cycle and finally stabilize at a low value.