化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (3) : 222-226.

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石墨烯/富锂三元正极复合材料的制备及电化学性能研究

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Preparation of Li_1.2Ni_0.133Co_0.133Mn_0.533O₂ anode material and its electrochemical performance

Zhang Junting¹, Wang Zhen², Wen Guangwu^1,2, Wang Fagang¹

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Received		Published
2018-10-23		2020-03-20
Issue Date	Revised Date
2020-04-02	2018-10-23

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摘要

通过水热法制备了石墨烯包覆量不同的石墨烯/富锂三元正极复合材料。采用X射线衍射仪、扫描电子显微镜和电化学交流阻抗等对包覆后富锂三元正极复合材料的物相结构、形貌及电化学性能进行了研究。结果表明:石墨烯包覆量为2%(质量分数)时,包覆效果较好,石墨烯/富锂三元正极复合材料首次库仑效率为89.6%,比富锂三元正极材料提高了17.16%,放电比容量为226.41mAh/g,比原材料提高了21.38mAh/g;以0.5C循环100次后石墨烯/富锂三元正极复合材料放电比容量可保持在154mAh/g,容量保持率为88%,比富锂三元正极材料提高了5.3%;石墨烯/富锂三元正极复合材料阻抗为75Ω,比富锂三元正极材料阻抗低50Ω。

Abstract

Lithium-rich anode material Li_1.2Ni_0.133Co_0.133Mn_0.533O₂ was prepared by hydrothermal method and coated with graphene.The phase structure,morphology and electrochemical properties of the coated materials were investigated by X-ray diffraction (XRD),scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS).The results shown that when the coating amount was 2wt%,the Li-rich material had a good coating effect.Its first Coulomb efficiency was 89.6%,which was 17.16% higher than the original material.The discharge specific capacity was 226.41mAh/g,which was 21.38mAh/g higher than the original material.The discharge specific capacity after 100 cycles of 0.5C can be maintained at 154mAh/g,its capacity retention rate was 88%,which was 5.3% higher than the original material.The impedance was 75Ω,which was much smaller than the 125Ω of the raw material.

关键词

石墨烯 / 富锂三元正极材料 / 水热法 / 锂离子电池

Key words

graphene / lithium-rich anode material / hydrothermal method / lithium-ion battery

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石墨烯/富锂三元正极复合材料的制备及电化学性能研究[J]. 化工新型材料, 2020, 48(3): 222-226 DOI:

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基金资助

泰山学者基金(ts201511080)

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