物理化学学报 >> 2017, Vol. 33 >> Issue (12): 2510-2516.doi: 10.3866/PKU.WHXB201705311

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基于三维花状五氧化二铌及活性炭的锂离子混合电容器

贾朝阳1,2,刘美男2,*(),赵新洛3,王贤树2,潘争辉2,张跃钢2,4,*()   

  1. 1 上海大学化学系,上海200444
    2 中国科学院苏州纳米技术与纳米仿生研究所,江苏苏州215123
    3 上海大学物理系,上海200444
    4 清华大学物理系,北京100084
  • 收稿日期:2017-05-08 发布日期:2017-09-05
  • 通讯作者: 刘美男,张跃钢 E-mail:mnliu2013@sinano.ac.cn;ygzhang2012@sinano.ac.cn
  • 基金资助:
    国家自然科学基金(51402345)

Lithium Ion Hybrid Supercapacitor Based on Three-Dimensional Flower-Like Nb2O5 and Activated Carbon Electrode Materials

Zhao-Yang JIA1,2,Mei-Nan LIU2,*(),Xin-Luo ZHAO3,Xian-Shu WANG2,Zheng-Hui PAN2,Yue-Gang ZHANG2,4,*()   

  1. 1 Department of Chemistry, Shanghai University, Shanghai 200444, P. R. China
    2 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu Province, P. R. China
    3 Department of Physics, Shanghai University, Shanghai 200444, P. R. China
    4 Department of Physics, Tsinghua University, Beijing 100084, P. R. China
  • Received:2017-05-08 Published:2017-09-05
  • Contact: Mei-Nan LIU,Yue-Gang ZHANG E-mail:mnliu2013@sinano.ac.cn;ygzhang2012@sinano.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(51402345)

摘要:

锂离子混合电容器由于兼备锂离子电池和超级电容器的优势,即较高的能量密度和功率密度,而成为当前能量存储体系的研究热点。本工作合成了具有三维花状微纳结构的正交相五氧化二铌(T-Nb2O5),并将其与活性炭(AC)相匹配,设计出一种新型的T-Nb2O5/AC锂离子混合电容器。循环伏安和恒电流充放电的测试结果表明该锂离子混合电容器具有较好的电化学性能,如在碳酸酯类的有机电解液中,工作电压可达到3.0 V;在100 mA·g-1的电流密度下,电容器的比能量和比功率密度可达到53.79 Wh·kg-1和294 W·kg-1;在200 mA·g-1的电流密度下,经过1000次充放电循环后,该电容器的比能量保持率为73%。由此可见,本工作开发的T-Nb2O5/AC锂离子混合电容器将在高功率的储能设备中有很好地应用前景。

关键词: 锂离子混合电容器, 三维花状结构, 正交相五氧化二铌, 有机电解液, 活性炭

Abstract:

A lithium ion hybrid supercapacitor system with battery and supercapacitor characteristics has the potential to meet the increasing demand for an energy storage device with both high energy and power densities. In this work, orthorhombic Nb2O5 (T-Nb2O5) with three-dimensional (3D) flower-like structures was synthesized by a facile hydrothermal reaction and an annealing process. A lithium ion hybrid supercapacitor was constructed by using T-Nb2O5 as an anode and commercial activated carbon (AC) as a cathode. The electrochemical performance of these T-Nb2O5/AC hybrid capacitors was measured by cyclic voltammetry and galvanostatic charge/discharge tests. The results showed that the working voltage of the hybrid supercapacitor could reach 3.0 V in the organic carbonate electrolyte system. The as-assembled device showed impressive power density of 294 W·kg-1 and energy density of 53.79 W·h·kg-1 at a current density of 100 mA·g-1 with a voltage range of 0.5-3.5 V. Moreover, it also showed excellent cycling stability with a retention of 73% after 1000 cycles at 200 mA·g-1. These results demonstrate that this novel lithium ion hybrid supercapacitor based on T-Nb2O5 with 3D flower-like structures and AC is a promising candidate for high power density energy storage applications.

Key words: Lithium ion hybrid supercapacitor, Three-dimensional flower-like structure, Orthorhombic Nb2O5, Organic electrolyte, Activate carbon

MSC2000: 

  • O646