摘要
采用液相球化法合成了具有亚微米颗粒的球形团簇微结构的新型锂离子电池正极材料磷酸钒锂(Li3V2(PO4)3).X射线衍射(XRD)分析表明,液相球化法合成的Li3V2(PO4)3为单斜结构,属于P21/n空间群.扫描电镜(SEM)形貌观察表明,合成的Li3V2(PO4)3一次颗粒粒径在亚微米数量级,分布均匀,团簇粒径在10μm左右.电化学测试表明,所得样品在充放电电流密度为55.6mA·g-1,充放电电压范围为3.0-4.3V和3.0-4.9V(vsLi/Li+)的最大放电容量分别可达126.67和170.47mAh·g-1,首次充放电效率分别为95.6%和97.5%,材料的循环稳定性能良好.
A novel cathode material lithium vanadium phosphate with the microstructure of submicro-particles aggregate was synthesized by liquid-phase sphericizing granulation. XRD pattern showed that the crystal structure of Li3V2（PO4）3 was monoclinic and belonged to P21/n space group. SEM revealed that the diameters of the particle and aggregated particle were in submicron range and about 10 μm, respectively, with a narrow distribution. The electrochemical testing showed that the obtained Li3V2（PO4）3 had the maximum discharge capacity of 126.67 mAh·g^-1 and initial coulombic efficiency of 95.6% in the range of 3.0-4.3 V （vs Li/Li^＋）, and 170.47 mAh·g^-1 and 97.5% in the range of 3.0-4.9 V （vs Li/Li^＋） at a density of 55.6 mA·g^-1, respectively. Moreover, the material had a better cycle stability.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第12期1954-1957,共4页
Acta Physico-Chimica Sinica
关键词
锂离子电池
正极材料
磷酸钒锂
液相法
造粒
Li-ion batteries
Cathode material
Lithium vanadium phosphate
Liquid-phase method
Sphericizing granulation
作者简介
Corresponding author. Email： hugohou@btrchina.com; Tel： ＋86755-29892509.
