LiVOPO4/C的溶液沉积-热解法制备与表征

以LiVOPO₄、蔗糖为原料，采用溶液沉积-热解法制备了LiVOPO₄/C复合材料。采用热重与差热分析、X-射线衍射分析、扫描电镜分析以及电化学测试等手段对LiVOPO₄/C的微观结构、表面形貌和电化学性能进行了研究.结果表明：蔗糖热分解后在LiVOPO₄颗粒的表面包覆形成了一层多孔碳；多孔碳可以有效阻止LiVOPO₄颗粒的聚集，增加电极的导电面积，降低电池极化，改善LiVOPO₄ 的电化学性能；与LiVOPO₄粉末相比，LiVOPO₄/C具有更高的可逆容量、更稳定的循环性能.

Preparation and Characterization of LiVOPO4/C Composite Prepared by Solution Deposition-Pyrolysis Technique

LiVOPO₄/C  composite was prepared by solution deposition-pyrolysis method using LiVOPO₄ and sucrose as raw materials.The microstructure,surface morphology and electrochemical properties were characterized by various electrochemical methods in combination with X-ray diffraction (XRD) and scanning electron microscope (SEM).It is found that the porous carbon layer is coated on the surface of LiVOPO₄ due to the pyrolysis of sucrose.The porous carbon can prevent the LiVOPO₄ particles from aggregation,increase the conductive area of electrode,decrease the polarization of cell and improve the electrochemical properties of LiVOPO₄ effectively.Compared with LiVOPO₄,the LiVOPO₄/C composite has increased reversible capacity,stabilized cycling performance.