环氧树脂作还原剂制备Li3V2(PO4)3的结构和性能

采用高温固相法,以环氧树脂为还原剂合成锂离子电池正极材料Li3V2(PO4)3.通过X射线衍射分析和扫描电子显微镜对样品的晶体结构和微观形貌进行表征,并用恒电流充放电和循环伏安实验研究材料的电化学性能.结果表明所制备的Li3V2(PO4)3为结晶完善的单斜结构,颗粒分布均匀且粒径较小,0.2 C时在3.0V~4.3V电压范围的首次放电比容量为126.9 mAh/g,30次循环后的比容量为126.0 mAh/g,容量保持率达到99.29%.

Structure and Performance of Li3V2(PO4)3 Prepared with Epoxy Resin as the Reductant

Epoxy resin was used as the reductant and solid-state reaction was applied to synthesize Li3V2(PO4)3 cathode for lithium batteries. The crystal structure and morphology of the sample were characterized through X-ray diffraction analysis and with scanning electron microscopy. Galvanostatic charge-discharge and cyclic voltammetry were utilized to determine the electrochemical properties of the sample. The results have shown that the synthesized Li3V2(PO4)3 possess a well-developed monoclinic crystallite structure. Its particles distribute uniformly and the size is small. The initial discharge capacity is 126.9 mAh/g at the 0.2 C rate in the voltage range of 3.0~ 4.3 V. The discharge capacity is 126.0 mAh/g and the capacity retention rate is 99.29% after 30 cycles.