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2222材料工程  2020, Vol. 48 Issue (1): 128-135    DOI: 10.11868/j.issn.1001-4381.2018.000310
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
AC+Li(NiCoMn)O2/Li4Ti5O12+MWCNTs混合型电容器
陈玮, 孙晓刚(), 胡浩, 王杰, 李旭, 梁国东, 黄雅盼, 魏成成
南昌大学 机电工程学院, 南昌 330031
AC+Li(NiCoMn)O2/Li4Ti5O12+MWCNTs hybrid capacitors
Wei CHEN, Xiao-gang SUN(), Hao HU, Jie WANG, Xu LI, Guo-dong LIANG, Ya-pan HUANG, Cheng-cheng WEI
College of Mechatronics Engineering, Nanchang University, Nanchang 330031, China
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摘要 

以钛酸锂(Li4Ti5O12)/多壁碳纳米管(MWCNTs)复合材料为负极、活性炭(AC)/镍钴锰酸锂(Li(NiCoMn)O2)复合材料为正极,组装成混合型电容器并研究其电化学性能。利用扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线衍射仪(XRD),拉曼光谱仪(Raman),热重分析仪(TGA)对电极材料进行分析,通过恒流充放电(GCD)和交流阻抗谱(EIS)研究混合型电容器的电化学性能。结果表明:掺杂适量MWCNTs和镍钴锰酸锂可提高电容器的电化学性能。当MWCNTs质量分数为5%时,在电流密度为0.1 A/g下恒流充放电时比容量达161.5 mAh/g。在0.1~1 A/g时,最大功率密度和最大能量密度分别为993.2 W/kg和52.2 Wh/kg。5000周次恒流充放电循环后,容量保持率在92.2%左右,库仑效率仍有99.1%,展现出较高的能量密度和功率密度,并具有优异的循环性能。

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陈玮
孙晓刚
胡浩
王杰
李旭
梁国东
黄雅盼
魏成成
关键词 多壁碳纳米管镍钴锰酸锂钛酸锂活性炭混合电容    
Abstract

The hybrid capacitors were assembled by using lithium titanate/multi-walled carbon nanotubes composite as anode and activated carbon/nickel cobalt manganese acid lithium composite as cathode. The electrode materials were analyzed by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffractomer (XRD), Raman spectrometer (Raman) and thermal gravimetric analyzer (TGA). The electrochemical performance of hybrid capacitors was tested by galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results indicate that the addition of multi-walled carbon nanotubes and lithium nickel cobalt manganese oxide can greatly improve the electrochemical performance of hybrid capacitors. The hybrid capacitors achieve a specific capacitance of 161.5 mAh/g at the current density of 0.1 A/g with an additive of 5% (mass fraction) multi-walled carbon nanotubes. The maximum power density and energy density reach 993.2 W/kg and 52.2 Wh/kg in the current range of 0.1-1 A/g, respectively. The continuous galvanostatic charge-discharge cycling tests reveal that the hybrid capacitors maintain capacitance rate retention of 92.2% and Coulomb efficiency of 99.1% after 5000 cycles. The hybrid capacitors show an excellent cycle performance with high energy and power density.

Key wordsmulti-walled carbon nanotubes    nickel cobalt manganese acid lithium    lithium titanate    activated carbon    hybrid capacitor
收稿日期: 2018-03-23      出版日期: 2020-01-09
中图分类号:  O646  
基金资助:江西省科技厅科研项目(20142BBE50071);江西省教育厅落地计划项目(KJD13006)
通讯作者: 孙晓刚     E-mail: xiaogangsun@163.com
作者简介: 孙晓刚(1957—), 男, 教授, 研究方向为碳纳米管及锂离子电池, 联系地址:江西省南昌市红谷滩新区南昌大学前湖校区机电工程学院(330031), E-mail:xiaogangsun@163.com
引用本文:   
陈玮, 孙晓刚, 胡浩, 王杰, 李旭, 梁国东, 黄雅盼, 魏成成. AC+Li(NiCoMn)O2/Li4Ti5O12+MWCNTs混合型电容器[J]. 材料工程, 2020, 48(1): 128-135.
Wei CHEN, Xiao-gang SUN, Hao HU, Jie WANG, Xu LI, Guo-dong LIANG, Ya-pan HUANG, Cheng-cheng WEI. AC+Li(NiCoMn)O2/Li4Ti5O12+MWCNTs hybrid capacitors. Journal of Materials Engineering, 2020, 48(1): 128-135.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000310      或      http://jme.biam.ac.cn/CN/Y2020/V48/I1/128
Fig.1  混合型电容器的内部结构图
Fig.2  镍钴锰酸锂(a)和钛酸锂(b)的XRD谱图
Fig.3  MWCNTs石墨化前后XRD谱图(a)和Raman谱图(b)
Fig.4  MWCNTs石墨化前后TGA曲线
Fig.5  正负极材料的微观形貌
(a)镍钴锰酸锂的SEM图;(b)钛酸锂的SEM图;(c)石墨化后MWCNTs的SEM图;(d)石墨化后MWCNTs的TEM图;(e)AC/NCM的SEM图;(f)Li4Ti5O12/MWCNTs的SEM图
Fig.6  不同组分电极材料的恒流充放电与倍率性能
(a)恒流充电;(b)恒流放电;(c)倍率性能
Fig.7  不同MWCNTs含量的混合型电容器在不同电流密度下的恒流充放电曲线,放电比容量图和Ragone图
(a)0%MWCNTs;(b)5%MWCNTs;(c)10%MWCNTs;(d)20%MWCNTs;(e)放电比容量图;(f)Ragone图
Fig.8  不同MWCNTs含量的混合型电容器的电化学交流阻抗谱图
Fig.9  不同MWCNTs含量的混合型电容器的充放电循环性能
(a)不同MWCNTs含量的容量保持率;(b)含5%MWCNTs的循环性能;(c)含5%MWCNTs的充放电曲线
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