CuGeO3/泡沫镍负极材料的制备及其电化学性能

doi:10.16085/j.issn.1000-6613.2021-0192

摘要/Abstract

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 CuGeO₃electrode was investigated. The results indicated that CuGeO₃/NF electrode exhibited better electrochemical performance in comparison with CuGeO₃electrode. 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: CuGeO₃anodes, hydrothermal synthesis, nanosheets, electrochemical properties

中图分类号:

TM912.9

彭得群. CuGeO₃/泡沫镍负极材料的制备及其电化学性能[J]. 化工进展, 2022, 41(1): 343-349.

PENG Dequn. Synthesis and electrochemical properties of CuGeO₃/Ni foam as binder-free anode for lithium ion batteries[J]. Chemical Industry and Engineering Progress, 2022, 41(1): 343-349.

图/表 11

图1 CuGeO3/NF电极材料的制备过程

图2 CuGeO3/NF电极材料的XRD图谱

图3 CuGeO3/NF电极材料的XPS图谱

图4 CuGeO3/NF电极材料的SEM图

图5 CuGeO3/NF电极材料的TEM、HRTEM和SAED图

图6 CuGeO3/NF电极材料的循环伏安曲线

图7 CuGeO3/NF电极材料的充放电曲线

图8 CuGeO3/NF电极材料的循环性能

表1 不同锗基三元氧化物的循环性能对比

电极材料	电流密度/A·g^-1	循环次数	可逆比容量/mA·h·g^-1	容量保持率/%	参考文献
Zn₂GeO₄/石墨烯	0.3	600	702	―	［7］
Cd₂Ge₂O₆/RGO	0.1	100	730	75.3	［30］
CoGCs/C-4	0.2	100	630.6	48.5	［14］
PbGeO₃/GNS	0.1	50	607	53	［15］
CuGeO₃/rGO-30	0.1	200	909	93.2	［17］
CuGeO₃/NF	0.2	500	972	94.1	本文工作
	0.5	600	712	91.3

图9 CuGeO3/NF和CuGeO3两种电极材料的倍率性能

图10 CuGeO3/NF和CuGeO3两种电极材料的电化学阻抗谱

参考文献 30

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CuGeO₃/泡沫镍负极材料的制备及其电化学性能

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

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