化工进展 ›› 2022, Vol. 41 ›› Issue (1): 343-349.DOI: 10.16085/j.issn.1000-6613.2021-0192

• 材料科学与技术 • 上一篇    下一篇

CuGeO3/泡沫镍负极材料的制备及其电化学性能

彭得群()   

  1. 运城学院应用化学系,山西 运城 044000
  • 收稿日期:2021-01-27 修回日期:2021-07-13 出版日期:2022-01-05 发布日期:2022-01-24
  • 作者简介:彭得群(1982—),男,博士,研究方向为锂离子电池负极材料。E-mail:pengdequn@ycu.edu.cn
  • 基金资助:
    山西省优秀博士来晋科研专项(QZX-2019005);运城学院博士科研启动项目(YQ-2018014)

Synthesis and electrochemical properties of CuGeO3/Ni foam as binder-free anode for lithium ion batteries

PENG Dequn()   

  1. Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, Shanxi, China
  • Received:2021-01-27 Revised:2021-07-13 Online:2022-01-05 Published:2022-01-24

摘要:

采用原位生长法,在泡沫镍(nickel foam,NF)基底上制备具有三维互连结构的CuGeO3纳米片,直接将CuGeO3/NF电极材料用作锂离子电池电极,省去了涂覆法制备粉末电极所需的高分子黏结剂。利用X射线衍射仪、X射线光电子能谱、扫描电镜和透射电镜分析了电极材料的结构和形貌,测试了CuGeO3/NF和CuGeO3两种负极材料的电化学性能。结果表明,与传统涂覆法制备的CuGeO3粉末电极相比,CuGeO3/NF无黏结剂型电极具有更好的循环性能和倍率性能。在0.2A/g电流密度下500次循环后,可逆比容量为972mA·h/g,容量保持率94.1%;在电流密度为1A/g时,可逆比容量为578mA·h/g,电流密度恢复至0.1A/g时,可逆比容量升高至936mA·h/g。CuGeO3/NF电极材料良好的电化学性能归因于泡沫镍的三维导电网络结构。此外,泡沫镍负载CuGeO3纳米片加快了嵌锂/脱锂过程中电子和离子的传输,缓解了活性物质的体积膨胀。

关键词: CuGeO3负极材料, 水热合成, 纳米片, 电化学性能

Abstract:

Three-dimensional interconnected CuGeO3 nanosheets were directly grown on nickel foam (NF) substrates by in-situ generation method, and the CuGeO3/NF was directly used as binder-free anodes for lithium ion batteries (LIBs). The microstructure and morphology of the materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscope. Electrochemical performance of CuGeO3/NF and CuGeO3 electrode was investigated. The results indicated that CuGeO3/NF electrode exhibited better electrochemical performance in comparison with CuGeO3 electrode. The CuGeO3/NF electrode showed reversible capacity of 972mA·h/g at a current density of 0.2A/g after 500 cycles with capacity retention of 94.1% when the current density returned to 0.1A/g from 1A/g (578mA·h/g). CuGeO3/NF electrode delivered a high capacity of 936mA·h/g. The superior electrochemical performance of the CuGeO3/NF electrode can be attributed to three-dimensional conductive network of the Ni foam. Additionally, the Ni foam supported CuGeO3 nanoflakes promoted fast electron and ion transport, and alleviated the volume change during the Li+ insertion/extraction process.

Key words: CuGeO3 anodes, hydrothermal synthesis, nanosheets, electrochemical properties

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