碳含量对磷酸钒锂电化学性能的影响

发布时间：2018-05-24 22:21

  本文选题：锂离子电池 + 正极材料　； 参考：《粉末冶金技术》2014年06期

【摘要】：以LiOH·H2O、NH4VO3、NH4H2PO4和葡萄糖为原料,采用水热法制备碳包覆的磷酸钒锂化合物,利用XRD、SEM、TEM、恒流充放电测试、交流阻抗测试等手段,对产物的结构、形貌和电化学性能进行表征,研究了碳含量对材料电化学性能的影响。结果表明,在750℃焙烧的样品为单一纯相的单斜晶体结构,颗粒大小约1μm,分散性良好,且在颗粒表面包覆了一层无定形碳。在倍率0.1 C的电流密度下,在3.0~4.8 V电压范围内,碳含量为10.63%的样品首次放电容量达到163.6 m Ah/g;循环50次后,放电容量仍为156.5 m Ah/g,容量保持率为95.7%。
[Abstract]:Carbon-coated lithium vanadium phosphate compounds were prepared by hydrothermal method from LiOH H _ 2O _ 3 NH _ 4VO3H _ 4H _ 2PO _ 4 and glucose. The structure, morphology and electrochemical properties of the products were characterized by XRDX SEMMOTEM, constant current charge-discharge test, AC impedance measurement and so on. The effect of carbon content on the electrochemical properties of the materials was studied. The results show that the sample calcined at 750 鈩，

本文编号：1930829