+高级检索
非水体系中钒酸锂/聚吡咯复合正极材料的制备及性能研究
DOI:
作者:
作者单位:

深圳大学化学与环境工程学院,深圳大学化学与环境工程学院,深圳大学化学与环境工程学院,深圳大学化学与环境工程学院,深圳大学化学与环境工程学院

作者简介:

通讯作者:

中图分类号:

基金项目:


Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system
Author:
Affiliation:

College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University

Fund Project:

NSFC; the Natural Science Foundation of Guangdong

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    采用乙醇作为介质,FeCl3为氧化剂,对甲苯磺酸钠为掺杂剂,通过吡咯单体在钒酸锂表面的氧化聚合制备出了钒酸锂/聚吡咯(LiV3O8/PPy)复合材料。采用X-射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对复合材料的结构与形貌进行表征。用恒流充放电测试、循环伏安(CV)和交流阻抗(EIS)等研究了聚吡咯包覆量对材料电化学性能的影响。结果表明:在钒酸锂表面均匀地包覆了一层厚度约10nm的聚吡咯,但并没有改变钒酸锂的晶型结构。当聚吡咯包覆量为6% 时,复合材料的电化学性能最好,在0.1C充放电倍率下,首次放电比容量为274mAh/g,循环100次后样品的放电比容量为239.4mAh/g,容量保持率为87.4%,而未包覆PPy的LiV3O8,其首次放电比容量为227.4mAh/g,循环100次后样品的放电比容量为160.1mAh/g,容量保持率仅为70.4%。LiV3O8/PPy复合正极材料的电化学性能得到了明显提高。

    Abstract:

    LiV3O8/polypyrrole (PPy) composite materials were prepared by an oxidative polymerization of pyrrole monomer on the surface of LiV3O8 using ethanol as medium, FeCl3 as oxidant, benzene sulfonic acid sodium salt as dopant. The crystal structures and microstructures of LiV3O8/PPy were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The electrochemical properties of the composites were investigated with galvanostatic charge–discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that 10nm pyrrole was uniformly polymerized around the LiV3O8, and the PPy-coating did not alter the crystal structure of the LiV3O8. LiV3O8/PPy composite material containing 6% PPy (LVP6) exhibits perfect electrochemical properties, its first discharge capacity reaches a high specific discharge capacity of 274 mAh/g and maintains a stable capacity of 239.4 mAh/g within 100 cycles at the charge–discharge rate of 0.1 C and in the voltage range of 1.8~4.0 V, the capacity retention is 87.4%. But the pure LiV3O8 shows that the first discharge capacity is 227.4 mAh/g and the discharge capacity is 160.1 mAh/g after 100 cycles, the capacity retention is only about 70.4%. LiV3O8/PPy composite materials show better cycling performance than the pure LiV3O8.

    参考文献
    相似文献
    引证文献
引用本文

石钏,胡盛名,任祥忠,高原,张培新.非水体系中钒酸锂/聚吡咯复合正极材料的制备及性能研究[J].稀有金属材料与工程,2018,47(S2):277~281.[Chuan Shi, Shengming Hu, Xiangzhong Ren, Yuan Gao, Peixin Zhang. Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system[J]. Rare Metal Materials and Engineering,2018,47(S2):277~281.]
DOI:[doi]

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2017-12-04
  • 最后修改日期:2017-12-04
  • 录用日期:2018-02-01
  • 在线发布日期: 2018-11-01
  • 出版日期: