四氧化三钴<strong>/</strong>碳纳米管薄膜的水热合成及其储锂性能

doi:10.11901/1005.3093.2020.042

材料研究学报

2020, Vol. 34

Issue (8): 584-590 DOI: 10.11901/1005.3093.2020.042

研究论文

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四氧化三钴/碳纳米管薄膜的水热合成及其储锂性能

刘芝君, 李之锋(

), 王春香, 谢光明, 黄庆研, 钟盛文

江西理工大学材料科学与工程学院赣州 341000

Hydrothermal Synthesis and Electrochemical Performance of Co₃O₄@CNTs Composite Film

LIU Zhijun, LI Zhifeng(

), WANG Chunxiang, XIE Guangming, HUANG Qingyan, ZHONG Shengwen

School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

引用本文:

刘芝君, 李之锋, 王春香, 谢光明, 黄庆研, 钟盛文. 四氧化三钴/碳纳米管薄膜的水热合成及其储锂性能[J]. 材料研究学报, 2020, 34(8): 584-590.
Zhijun LIU, Zhifeng LI, Chunxiang WANG, Guangming XIE, Qingyan HUANG, Shengwen ZHONG. Hydrothermal Synthesis and Electrochemical Performance of Co₃O₄@CNTs Composite Film[J]. Chinese Journal of Materials Research, 2020, 34(8): 584-590.

全文: PDF(3741 KB) HTML

摘要:

以5-磺基水杨酸和戊二酸为螯合和氧化试剂，在水热条件下将硫酸钴氧化成纳米级Co₃O₄。以碳纳米管薄膜为载体将Co₃O₄颗粒紧密地附着在碳纳米管上使其填充入碳纳米管薄膜的空隙生成Co₃O₄/碳纳米管复合材料薄膜(Co₃O₄@CNTs)，并研究其储锂性能。电化学测试结果表明，Co₃O₄@CNTs薄膜具有较高的放电比容量和优异的倍率性能，在0.2C倍率下初始放电比容量高达1712.5 mAh·g^-1，100圈循环后放电比容量为1128.9 mAh·g^-1的；在1C倍率下100圈循环后放电比容量仍然保持527.8 mAh·g^-1。Co₃O₄@CNTs薄膜优异的性能源于Co₃O₄与CNTs的协同作用。高分散性的Co₃O₄增大了活性材料与电解液之间的接触面积，CNTs有助于形成良好的导电网络提高电子电导率，进而提高了Co₃O₄负极材料的循环性能和倍率性能。

关键词 ：复合材料, 负极材料, 水热法, Co₃O₄, 碳纳米管薄膜

Abstract：

A facile and effective method has been developed for synthesis of Co₃O₄/carbon nanotube film (Co₃O₄@CNTs) composites as anode materials in LIBs. With 5-sulfosalicylic acid and glutaric acid as chelation and oxidation reagents, the CoSO₄ can be directly oxidized into nanoscale Co₃O₄ under hydrothermal conditions. Co₃O₄/carbon nanotube film (Co₃O₄@CNTs) composites can be easily synthesized and the Co₃O₄ particles are tightly attached to carbon nanotubes via the same process. The electrochemical test results show that the composites film has higher discharge specific capacity and excellent rate performance. At 0.2C rate the initial discharge specific capacity can be up to 1712.5 mAh·g^-1, the discharge specific capacity is still about 1128.9 mAh·g^-1 after 100 cycles. At 1C rate the discharge specific capacity of 527.8 mAh·g^-1 is still maintained after 100 cycles. The excellent performance is due to the synergistic combination of Co₃O₄ and CNTs. The highly dispersed Co₃O₄ expands the contact area between the active material and the electrolyte, and CNTs can form the conductive network to increase the electron conductivity, thus improve the cycle performance of Co₃O₄ anode materials.

Key words： composite anode material hydrothermal Co₃O₄ carbon nanotube film

收稿日期: 2020-02-12

ZTFLH:

O614.8

基金资助:国家自然科学基金(51874151);国家自然科学基金(51964017);江西省教育厅自然科学基金(GJJ160202);江西省教育厅自然科学基金(GJJ190428)

作者简介: 刘芝君，女，1993年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.042 或 https://www.cjmr.org/CN/Y2020/V34/I8/584

图1 Co3O4@CNTs复合材料制备流程的示意图

图2 Co3O4和Co3O4@CNTs的X射线衍射图谱

图3 Co3O4粉体和Co3O4@CNTs薄膜的扫描电镜照片

图4 Co3O4的X射线光电子能谱图

图5 Co3O4(a)和Co3O4@CNTs(b)薄膜电极的循环伏安曲线

图6 电流密度为50 mA·g-1条件下Co3O4和Co3O4@CNTs薄膜电极材料的充放电曲线

图7 Co3O4和Co3O4@CNTs薄膜电极不同倍率下的循环性能

图8 Co3O4和Co3O4@CNTs薄膜电极不同倍率下的循环性能

图9 Co3O4和Co3O4@CNTs 薄膜电极的Nyquist图

图10 Co3O4@CNTs薄膜电极循环100次和酸化处理CNTs薄膜的SEM图

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