Fe_(3)O_(4)/炭黑复合材料的制备及其电化学性能

Preparation and electrochemical properties of Fe_(3)O_(4)/carbon black composites

Fe_(3)O_(4)/炭黑复合锂离子电池负极材料既可以保持铁氧化物的高容量,又可以抑制Fe_(3)O_(4)的体积膨胀,具有稳定的循环性能和较高的比容量。将六水三氯化铁溶于去离子水,加入炭黑超声振荡,旋转蒸发、干燥、研磨,经过碳热还原制备了Fe_(3)O_(4)/炭黑复合材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、拉曼光谱(Raman)、热重、循环伏安、充放电循环、倍率性能测试,对样品的结构、微观形貌、组成、电化学性能进行表征。实验结果表明,制备的Fe_(3)O_(4)/炭黑复合材料具有优异的循环稳定性和倍率性能,当质量比CB(炭黑)∶FeCl_(3)·6H_(2)O=1∶3时,制备的复合材料在电流密度为0.1 A/g下,经过100圈循环后仍然具有404.1 mAh/g的可逆容量。

Fe_(3)O_(4)/carbon black composites can inhibit the volume expansion of Fe_(3)O_(4)in the process of charge and discharge,which has a stable cycling performance and a high capacity.Therefore,it is of far-reaching significance to study the preparation of Fe_(3)O_(4)/carbon black composites.In this paper,Fe_(3)O_(4)/carbon black composites were prepared by dissolving FeCl3·6 H2 O in deionized water,and then carbon black was added for ultrasonic vibrationrotation,evaporation,drying,grinding and carbon thermal reduction.The microstructure,morphology,composition and electrochemical properties of the samples were tested by X-ray diffraction(XRD),scanning electron microscope(SEM),Raman spectroscopy,thermogravimetry,cyclic voltammetry,charge-discharge cycle and multiplication performance tests.The experimental results show that Fe_(3)O_(4)/carbon black composites are successfully prepared.In the electrochemical performance test,Fe_(3)O_(4)/carbon black composites have excellent cyclic stability and multiplying performance,among which carbon black∶FeCl_(3)·6 H_(2)O=1∶3 composite exhibits a reversible capacity of 404.1 mAh/g after 100 cycles at the current density of 0.1 A/g.