Co<sub>3</sub>O<sub>4</sub>与膨胀石墨自组装的多面体复合物作为锂离子电池阳极材料

欧云; 唐智勇; 黄登峰; 赵腾飞; 刘龙飞; 成娟娟

doi:10.13801/j.cnki.fhclxb.20220727.003

Co₃O₄与膨胀石墨自组装的多面体复合物作为锂离子电池阳极材料

doi: 10.13801/j.cnki.fhclxb.20220727.003

欧云^{1, 2},
唐智勇¹,
黄登峰¹,
赵腾飞¹,
刘龙飞¹,
成娟娟^1, ,

1.
湖南科技大学　材料科学与工程学院，湘潭 411201
2.
湖南科技大学　机械设备健康维护湖南省重点实验室，湘潭 411201

基金项目: 国家自然科学基金(11702092)；湖南省自然科学基金(2020JJ5182；2020JJ4288)；湖南省教育厅项目(20B225)；湖南省光电惯性工程技术研究中心开放基金(HN-NUDT1904)

详细信息

通讯作者:
成娟娟，博士，讲师，硕士生导师，研究方向为锂二次电池　E-mail: jjcheng@hnust.edu.cn

中图分类号: TB333；TQ152
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出版历程
- 收稿日期: 2022-05-05
- 修回日期: 2022-06-27
- 录用日期: 2022-07-11
- 网络出版日期: 2022-07-28
- 刊出日期: 2023-05-15

Co₃O₄ and expanded graphite self-assembled polyhedron composites used as anode materials for lithium ion batteries

1.
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2.
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China

Funds: National Natural Science Foundation of China (11702092); Natural Science Foundation of Hunan Province (2020JJ5182; 2020JJ4288); Hunan Provincial Education Department Project (20B225); Hunan Engineering Research Center of Optoelectronic Inertial Technology (HN-NUDT1904)

摘要

摘要: 作为锂离子电池的负极材料，Co₃O₄因其具有890 mA·h/g的高理论比容量而备受关注。本文通过简单的化学溶液法和热处理制备了Co₃O₄与膨胀石墨(EG)自组装的多面体复合材料(Co₃O₄-EG)。当用作锂离子电池的负极材料时，EG与Co₃O₄质量比为1∶3的Co₃O₄-EG复合材料电极在0.1 C的电流倍率下经过400次循环后的可逆容量仍高达418 mA·h/g，高于其他Co₃O₄-EG复合材料(质量比1∶4循环190圈后容量为273 mA·h/g，质量比1∶5循环135圈后的容量为329 mA·h/g)，且所有Co₃O₄-EG复合材料的放电容量均高于纯Co₃O₄(400圈循环后容量为40 mA·h/g)。Co₃O₄的纳米结构、EG的优良导电性及自组装后的多面体结构的协同作用使Co₃O₄-EG复合材料具有优异的储锂性能。
- Co₃O₄阳极 /
- 膨胀石墨 /
- Co₃O₄-EG复合材料 /
- 锂离子电池 /
- 自组装
Abstract: As a cathode material for lithium ion batteries, Co₃O₄ has attracted much attention due to its high theoretical specific capacity of 890 mA·h/g. In this paper, Co₃O₄ and expanded graphite self-assembled polyhedral composites (Co₃O₄-EG) were prepared by simple chemical solution method and heat treatment. When used as the anode material of lithium ion battery, the reversible capacity of Co₃O₄-EG composite electrode with the mass ratio of EG to Co₃O₄ of 1∶3 after 400 cycles at the current rate of 0.1 C is still as high as 418 mA·h/g, which is higher than that of other Co₃O₄-EG composite materials (The capacity is 273 mA·h/g after 190 cycles with a mass ratio of 1∶4 and 329 mA·h/g after 135 cycles with a mass ratio of 1∶5). And the discharge capacity of all Co₃O₄-EG composites is higher than that of pure Co₃O₄ (The capacity is 40 mA·h/g after 400 cycles). The nanostructure of Co₃O₄, the excellent electrical conductivity of expanded graphite and the synergistic effect of self-assembled polyhedron structure make Co₃O₄-EG composites have excellent lithium storage properties.
- Co₃O₄ anode /
- expanded graphite /
- Co₃O₄-EG composite /
- Li-ion batteries /
- self-assembled

HTML全文

图 1 纯Co₃O₄和Co₃O₄-EG组分的制备示意图

Figure 1. Illustration of preparation for pure Co₃O₄ and Co₃O₄-EG composition

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图 2 制备的Co₃O₄-EG复合材料、纯Co₃O₄样品和EG的SEM图像：((a), (d)) EG∶Co₃O₄=1∶3； ((b), (e)) EG∶Co₃O₄=1∶4；((c), (f)) EG∶Co₃O₄=1∶5；(g) Co₃O₄；((h), (i)) EG

Figure 2. SEM images of the as-prepared Co₃O₄-EG composites, Co₃O₄ samples and EG: ((a), (d)) EG∶Co₃O₄=1∶3; ((b), (e)) EG∶Co₃O₄=1∶4; ((c), (f)) EG∶Co₃O₄=1∶5; (g) Co₃O₄; ((h), (i)) EG

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图 3 制备的Co₃O₄-EG复合材料、纯Co₃O₄样品和EG的XRD图谱

Figure 3. XRD patterns of the as-prepared Co₃O₄-EG composites, pure Co₃O₄ sample and EG

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图 4 Co₃O₄-EG复合材料和纯Co₃O₄电极在初始两个循环中的CV曲线

Figure 4. CV curves of Co₃O₄-EG composites and pure Co₃O₄ electrodes during the initial two cycles

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图 5 Co₃O₄-EG复合电极、Co₃O₄电极和EG电极在0.1 C倍率下的初始三圈恒流充放电曲线((a)~(e))及对应的交流阻抗图谱(f)

Figure 5. Initial three-cycle constant current charge-discharge curves ((a)-(e)) and corresponding AC impedance spectra (f) of Co₃O₄-EG composite electrode, Co₃O₄ electrode and EG electrode at 0.1 C

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图 6 Co₃O₄-EG复合材料和纯Co₃O₄电极的循环性能：电流倍率为0.1 C时的循环稳定性(a)和库仑效率(b)；电流倍率为0.5 C时的循环稳定性(c)和库仑效率(d)

Figure 6. Cycling performance of the Co₃O₄-EG composites and pure Co₃O₄ electrodes: Cycling stability (a) and coulombic efficiency (b) at current rate of 0.1 C; Cycling stability (c) and coulombic efficiency (d) at current rate of 0.5 C

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