Citation: Zheng Junsheng, Qin Nan, Jin Liming, Guo Xin, Shen Chao, Wu Qiang, Zheng Jim P.. Constructing an unbalanced structure toward high working voltage for improving energy density of non-aqueous carbon-based electrochemical capacitors[J]. Chinese Chemical Letters, ;2020, 31(3): 903-908. doi: 10.1016/j.cclet.2019.09.048 shu

Constructing an unbalanced structure toward high working voltage for improving energy density of non-aqueous carbon-based electrochemical capacitors

Zheng Junsheng ^a,b,*, ,
Qin Nan ^a,b ,
Jin Liming ^a,b,c ,
Guo Xin ^a,b ,
Shen Chao ^c ,
Wu Qiang ^c ,
Zheng Jim P. ^b,c

a.
Clean Energy Automotive Engineering Center, Tongji University(Jiading Campus), Shanghai 201804, China
b.
School of Automotive Studies, Tongji University(Jiading Campus), Shanghai 201804, China
c.
Department of Electrical and Computer Engineering, Florida A & M University-Florida State University College of Engineering, FL 32304, United States

jszheng@tongji.edu.cn

Received Date: 20 July 2019
Revised Date: 21 August 2019
Accepted Date: 25 September 2019
Available Online: 25 September 2019

Figures(4)

The energy density of non-aqueous carbon-based electrochemical capacitors (cEC) is mainly determined by the specific capacitance and operational voltage range. In this study, we propose to construct an unbalanced structure to make full use of stable voltage range for improving energy density. The stable voltage range is firstly carefully explored using cyclic voltammetry. Then an unbalanced carbon-based electrochemical capacitor (ucEC) is constructed with an optimized positive electrode to negative electrode weight ratio and voltage range. Its electrochemical performance is comprehensively investigated, including energy density, power density as well as cycle life. The ucEC is capable to deliver an improved energy density up to 64.9 Wh/kg (1.4 times as high as a general cEC) without sacrificing the power density and cycle life. The electrode properties after cycling are also analyzed, illustrating the change of electrode potential caused by unbalanced structure. The proposed structure demonstrates a great potential for improving the energy density at little cost of electrode design and cell configuration.
- Unbalanced electrochemical capacitor,
- Non-aqueous electrolyte,
- High working voltage,
- Practical application,
- High energy density
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