碳布负载的PI-MWCNTs柔性电极材料的合成及其电容性能

doi:10.11868/j.issn.1001-4381.2020.000733

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摘要

以超级电容器的电极材料制备、性质研究及对组装非对称超级电容器的性能研究为核心内容，提高超级电容器电化学性能为主要目的，采用原位聚合法制备羧基化多壁碳纳米管（PI-MWCNTs）接枝的聚酰亚胺溶液，将其作为氮掺杂碳的前驱体，实现复合物在碳布表面的生长，并作为电极材料。以二氧化锰-碳布（MnO₂-CC）为正极，多壁碳纳米管接枝的聚酰亚胺-碳布为负极（PI-MWCNTs-CC），构建非对称超级电容器。采用扫描电子显微镜、拉曼光谱、X射线衍射、比表面积及孔径测试、循环伏安、恒电流充放电及电化学阻抗谱对电极材料的结构和电化学性能进行表征。结果表明：当扫描速率为20 mV/s时，非对称电容器的电势窗口可增至1.3 V，其体积比容量为1.80 F/cm³；当功率密度为14.08 mW/cm³时，能量密度可达到0.423 mWh/cm³。

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	王瑶
	么贺祥
	俞娟
	王晓东
	黄培

关键词 ：聚酰亚胺, 碳布, 碳纳米管, 二氧化锰, 非对称超级电容器

Abstract：

Taking the preparation of electrode materials of supercapacitors, the study of properties and the performance of assembled asymmetric supercapacitors as the core contents, and improving the electrochemical performance of supercapacitors as the main purpose, the in-situ polymerization method was used to prepare carboxylated multi-walled carbon nanotubes (PI-MWCNTs) grafted polyimide solution, which is used as the precursor of nitrogen-doped carbon to realize the growth of composites on the surface of carbon cloth and as electrode material.Manganese dioxide-carbon cloth (MnO₂-CC) as the positive electrode, Polyimide-carbon cloth grafted with multi-walled carbon nanotubes as negative electrode (PI-MWCNTs-CC), build asymmetric supercapacitors. The structure and electrochemical properties of the electrode materials were characterized by scanning electron microscopy, raman spectroscopy, surface area and pore size testing, X line photoelectron spectroscopy, cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. According to the study, when the scan rate is 20 mV/s, asymmetric capacitor potential window can be increased to 1.3 V and its volume specific capacity is 1.80 F/cm³.When the power density is 14.08 mW/cm³, the energy density can reach up to 0.423 mWh/cm³.

Key words： polyimide carbon cloth carbon nanotube manganese dioxide asymmetric supercapacitor

收稿日期: 2020-08-05 出版日期: 2021-09-17

中图分类号:

TQ152

通讯作者: 黄培 E-mail: phuang@njut.edu.cn

作者简介: 黄培(1967-), 男, 教授, 博士, 主要从事功能材料的合成及应用研究, 联系地址: 江苏省南京市浦口区浦珠南路30号南京工业大学先进聚合物研究所(211800), E-mail: phuang@njut.edu.cn

引用本文:

王瑶, 么贺祥, 俞娟, 王晓东, 黄培. 碳布负载的PI-MWCNTs柔性电极材料的合成及其电容性能[J]. 材料工程, 2021, 49(9): 51-59.
Yao WANG, He-xiang YAO, Juan YU, Xiao-dong WANG, Pei HUANG. Synthesis of PI-MWCNTs flexible electrode material loaded on carbon cloth and its capacitive performance. Journal of Materials Engineering, 2021, 49(9): 51-59.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000733 或 http://jme.biam.ac.cn/CN/Y2021/V49/I9/51

Fig.1 电化学沉积制备MnO₂-CC(a)，非对称超级电容器的组装(b)和前驱体溶液PAA/MWCNTs的制备(c)

Fig.2 电极材料的SEM图
(a)，(b)纯碳布；(c)，(d)PI-MWCNTs-CC；(e)，(f)MnO₂-CC

Fig.3 PI-MWCNTs-CC的EDS能谱元素分析图
(a)C; (b)N; (c)O; (d)元素能谱图

Fig.4 CC, PI-MWCNTs-CC的拉曼图谱(a)及生长在碳布上的MnO₂-CC电极材料的XRD图谱(b)

Fig.5 吸脱附曲线和孔径分布图
(a)碳布; (b)PI-MWCNTs-CC; (c)MnO₂-CC

Fig.6 PI-MWCNTs-CC电极的电化学性能测试分析图
(a)CC和PI-MWCNTs-CC的CV曲线对比图; (b)PI-MWCNTs-CC在不同扫描速率下的CV曲线图；(c)CC和PI-MWCNTs-CC的GCD曲线对比图；(d)PI-MWCNTs-CC在不同电流密度下的GCD曲线图；(e)PI-MWCNTs-CC质量比电容图；(f)PI-MWCNTs-CC的EIS谱图

Fig.7 MnO₂-CC电极的电化学性能测试分析图
(a)不同扫描速率下的CV曲线图；(b)不同电流密度下的GCD曲线图；(c)不同电流密度下质量比电容图；(d)EIS谱图

Fig.8 非对称柔性超级电容器的电化学性能测试分析图
(a)不同电压下的CV曲线图; (b)不同扫描速率下的CV曲线图; (c)不同电流密度下的GCD曲线图; (d)体积比电容图; (e)EIS谱图; (f)Ragone图

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