LiFePO_4/CNT复合材料的制备及电化学性能

Synthesis and electrochemical performances of LiFePO_4/CNT composite materials

采用溶胶凝胶-微波法制备LiFePO4/碳纳米管(CNT)复合正极材料.考察不同微波时间和CNT含量对其电化学性能的影响,并通过X射线衍射(XRD)和扫描电子显微镜(SEM)对样品的晶型结构和表面形貌进行表征.结果表明:掺CNT量为2%(质量分数)和微波18 min所得样品有较好的电化学性能;0.1C充放电的首次放电比容量为142 mAh.g-1,第10次循环的比容量为136 mAh.g-1.

LiFePO4/carbon nanotube （CNT） composite cathode materials were synthesized by a sol-gel-microwave method. The effects of microwave time and CNT content on the electrochemical properties of LiFePO4/CNT were studied and the crystal structure and surface morphology were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that the samples with better electrochemical performance are obtained when the CNT content in LiFePO4/CNT is 2% and the microwave time is 18 rain. When charge-discharge cycling at 0. 1 C, the initial specific discharge capacity is 142 mAh·g^-1 and the specific capacity at the 10th cycle is 136mAh·g^-1.