中华医学超声杂志

应用化学 ›› 2009, Vol. 26 ›› Issue (10): 1236-1240.

• 研究论文 • 上一篇    下一篇

反应物分散条件对Li1+xV3O8电化学性能的影响

刘永梅,郭永榔   

  1. (福州大学化学化工学院 福州 350108)
  • 出版日期:2009-10-10 发布日期:2009-10-10
  • 通讯作者: 郭永榔，男，教授; E-mail:yguo@fzu.edu.cn; 研究方向：电池电极材料

Different Reactant Dispersion on the Electrochemical Performance of Li1+xV3O8

LIU Yong-Mei, GUO Yong-Lang   

  1. (College of Chemistry and Chemical Engineering,Fuzhou University,Fuzhou 350108)
  • Published:2009-10-10 Online:2009-10-10

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摘要：

以Li2CO3和NH4VO3为原料,在不同条件下合成了锂离子电池正极材料用Li1+xV3O8。研究了反应物的分散条件和煅烧温度对产物晶型结构、形貌及电化学性能的影响。 XRD、IR和SEM结果表明,用超声波在无水乙醇中分散反应物得到的前驱体于550 ℃下煅烧，所得产物Li1+xV3O8结晶度低、粒径小、形貌均匀。 充放电、循环伏安等结果表明,该材料在充放电过程中极化低、嵌脱锂位置多、循环稳定性好。 在0.5 C放电条件下,第2次循环放电容量达到268 mA·h/g,100次循环后容量仍保持210 mA·h/g以上。

关键词: 锂离子电池，Li1+xV3O8，超声波分散，固相合成

Abstract:

The anodic material of Li1+xV3O8 was synthesized with Li2CO3 and NH4VO3 as the reactants under different conditions. The effects of the reactant dispersion and the calcining temperature on the structure, morphology and electrochemical properties of the products were investigated. XRD, IR and SEM experiments show that the sample synthesized at 550 ℃ from the precursor obtained with ultrasonically treating reactants in anhydrous ethanol has low crystallinity, small grain size and homogeneous morphology. And it has low polarization, more lithium insertion/extraction sites and good cyclability. Its discharge capacity reaches 268 mA·h/g in the 2nd cycle at a discharge rate of 0.5 C and still retains 210 mA·h/g after 100 cycles.

Key words: Li-ion batteries，Li1+xV3O8 ，ultrasonic dispersal，solid-state reaction

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