508
Home
Dr.Wu
Research
Member
Publications
News
Contact
Publications
 
All
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2007
2006
   
Electrochemical impedance spectroscopy study of lithium-ion capacitors: Modeling and capacity fading mechanism
Posted:2021-01-13 09:03    Column:2021

X.H. Zhang, X. Zhang*, X.Z. Sun, Y.B. An, S. Song, C. Li, K. Wang, F.Y. Su, C.-M. Chen, F.Y. Liu, Z.-S. Wu, Y.W. Ma

Journal of Power Sources, 2021, 488, 229454.

DOI:10.1016/j.jpowsour.2021.229454[PDF]

As important electrochemical power storage technology, lithium-ion capacitors (LICs) combine the advantages of both electric double layer capacitors (EDLCs) and lithium-ion batteries (LIBs). The impedance performances of LICs have been analyzed using electrochemical impedance spectroscopy (EIS), and the impedance equivalent circuit model (ECM) of LICs is established. Based on the EIS results, the ECM is established to describe the impedance behavior of LICs. The impedance characteristic variations (the ohmic resistance, charge transfer resistance and porous diffusion resistance) of LICs are analyzed with various open circuit voltage and different cycle numbers. The charging-discharging cut-off voltage and the cycle numbers greatly influence the LICs impedance and thus the capacity retention rate. It is shown that the capacity retention ratio is 73.8% after 80,000 cycle numbers when charging-discharging cut-off voltage is set to 2.0–4.0 V. When charging-discharging cut-off voltage is set to 2.2–3.8 V, the capacity retention ratio is 94.5% of the initial value after 200,000 cycle numbers. It provides useful guidance for setting the charging-discharging cut-off voltage of LICs.

Dalian Institute of Chemical Physics, CAS
457 Zhongshan Road Dalian, China 116023
E-mail: wuzs@dicp.ac.cn

Copyright © 2D Materials Chemistry & Energy Applications Group. All Rights Reserved.

Home / Dr.Wu / Research / Member / Publications / News / Contact