氮掺杂Co/Co3O4@C核壳纳米粒子作为锂电池负极材料的性能

doi:10.13229/j.cnki.jdxbgxb20210704

吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (2): 376-384.doi: 10.13229/j.cnki.jdxbgxb20210704

氮掺杂Co/Co₃O₄@C核壳纳米粒子作为锂电池负极材料的性能

魏素凤¹(),平昕²,李春霖²,王国勇²()

^1.长春工业大学材料科学与工程学院，长春 130012
^2.吉林大学材料科学与工程学院，长春 130022

收稿日期:2021-07-26 出版日期:2023-02-01 发布日期:2023-02-28
通讯作者: 王国勇 E-mail:weisufeng@gmail.com;materwanggy@jlu.edu.cn
作者简介:魏素凤（1979-），女，高级实验师，博士.研究方向：纳米材料.E-mail： weisufeng@gmail.com
基金资助:
国家自然科学基金重点研发项目(2018YFA0702304);长春市重点研发项目(3A4185522416)

N⁃doped Co/Co₃O₄@C core⁃shell nanoparticles as anode materials for lithium⁃ion batteries

Su-feng WEI¹(),Xin PING²,Chun-lin LI²,Guo-yong WANG²()

^1.College of Materials Science and Engineering，Changchun University of Technology，Changchun 130012，China
^2.College of Materials Science and Engineering，Jilin University，Changchun 130022，China

Received:2021-07-26 Online:2023-02-01 Published:2023-02-28
Contact: Guo-yong WANG E-mail:weisufeng@gmail.com;materwanggy@jlu.edu.cn

摘要/Abstract

摘要：

高容量的过渡金属氧化物要想替代目前低容量的商业碳作为锂离子电池负极材料，必须设计解决碎化问题和电导率问题。本文通过热解和水热氧化法合成了N掺杂的碳基 Co/Co₃O₄@C纳米粒子核壳结构复合材料。通过调整水热时间，可以获得结构完整、形态规则、尺寸均匀的产品。其作为锂离子电池电极材料，在0.1A/g恒流循环50次后，放电容量稳定在620 mA·h/g（碳质量分数为56.8%），高于其理论比容量，在2A/g恒流下250次循环后，可逆容量为572 mA·h/g，库仑效率可保持在99.8%左右。这说明具有良好分散性的N掺杂碳基Co/Co₃O₄@C纳米粒子核壳结构具有优良的结构稳定性和电导率，作为负极材料有希望应用于高容量、大功率的锂离子电池当中。

关键词: 金属有机骨架, 核壳结构, 锂离子电池, 负极材料

Abstract:

When high-capacity transition metal oxides want to replace current low-capacity commercial carbon as anode materials for lithium-ion batteries， they must be designed to solve the pulverization and conductivity issues. In this paper，N-doped carbon-based Co/Co₃O₄@C core-shell structure composites by pyrolysis and hydrothermal oxidation were innovatively synthesized by us. By adjusting the hydrothermal time， complete structure， regular morphology and uniform size product can be achieved. The core-shell structure composed of nitrogen-doped carbon can shorten the transmission path of lithium-ion， which leads to the high conductivity of these composites. In addition， there are more pores in the amorphous carbon， which can not only make full contact with the electrolyte during charging and discharging， but also reduce the volume expansion generated in the cycling process and delay the rate of capacity decay caused by the structural collapse. The results of the electrochemical show that the discharge capacity was stable at 620 mA·h/g （carbon content 56.8 wt%） after 50 cycles of constant current of 0.1 A/g， which is higher than its theoretical specific capacity. After 250 cycles， the reversible capacity can reach 572 mA·h/g and the coulomb efficiency can be maintained at about 99.8% under the constant current of 2A/g. The results show that the N-doped carbon-based Co/Co₃O₄ nanoparticle core-shell structure composites with good dispersion can improve the conductivity and electrochemical performance of the electrode of the high capacity of lithium ion batteries with a long cycle life.

Key words: metal-organic frameworks, core-shell structure, lithium-ion batteries, anode materials

中图分类号:

TB332

魏素凤,平昕,李春霖,王国勇. 氮掺杂Co/Co₃O₄@C核壳纳米粒子作为锂电池负极材料的性能[J]. 吉林大学学报(工学版), 2023, 53(2): 376-384.

Su-feng WEI,Xin PING,Chun-lin LI,Guo-yong WANG. N⁃doped Co/Co₃O₄@C core⁃shell nanoparticles as anode materials for lithium⁃ion batteries[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(2): 376-384.

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样本	电流密度/ （mA·g^-1）	容量/ （mA·h·g^-1）
Co₃O₄ nanoparticles	1000	462
MOF-derived Co₃O₄ microspheres	1000	392
Co₃O₄-CuO nanomatrix	1000	497.78
CoO@Co₃O₄@C	500	158±5
Co₃O₄/RGO	1000	77.7
Co₃O₄@N-CNFs	800	267
NCF/Co₃O₄	1000	340
N-doped Co/Co₃O₄@C（本文）	1000	498

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氮掺杂Co/Co₃O₄@C核壳纳米粒子作为锂电池负极材料的性能

N⁃doped Co/Co₃O₄@C core⁃shell nanoparticles as anode materials for lithium⁃ion batteries

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