Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors
The capacitance of Lithium-ion Capacitors (LiCs) highly depends on their terminal voltage. Previous research found that it varies in a nonlinear manner with respect to the voltage. However, none of them modeled the capacitance evolution while considering the physicochemical phenomena that happen in...
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doaj-ffec8e0ce71b478d869c49cce9f8fb2d2020-11-25T04:06:53ZengMDPI AGBatteries2313-01052020-11-016545410.3390/batteries6040054Development of a Capacitance versus Voltage Model for Lithium-Ion CapacitorsNagham El Ghossein0Ali Sari1Pascal Venet2Univ Lyon, University of Claude Bernard Lyon 1, Ecole Centrale de Lyon, INSA Lyon, CNRS, Ampère, F-69100 Villeurbanne, FranceUniv Lyon, University of Claude Bernard Lyon 1, Ecole Centrale de Lyon, INSA Lyon, CNRS, Ampère, F-69100 Villeurbanne, FranceUniv Lyon, University of Claude Bernard Lyon 1, Ecole Centrale de Lyon, INSA Lyon, CNRS, Ampère, F-69100 Villeurbanne, FranceThe capacitance of Lithium-ion Capacitors (LiCs) highly depends on their terminal voltage. Previous research found that it varies in a nonlinear manner with respect to the voltage. However, none of them modeled the capacitance evolution while considering the physicochemical phenomena that happen in a LiC cell. This paper focuses on developing a new capacitance model that is based on the Stern model of the electrochemical double layer capacitance. The model accounts for the asymmetric V-shape of the C(V) curve, which reflects the variation of the capacitance with respect to the voltage. The novelty of this study concerns the development of a model for LiCs that relies on the fundamental theory of Stern for the differential capacitance. The basic model of Stern is modified in order to account for the hybrid physicochemical structure of LiCs. Moreover, the model was applied to three aged cells to which accelerated calendar aging tests were applied at three voltage values: 2.2, 3 and 3.8 V. A drift of the voltage corresponding to the minimum capacitance was detected for the aged cells. This voltage is related to the neutral state of the positive electrode. The main cause of this phenomenon concerns the loss of lithium ions from the negative electrode of a LiC. In addition, capacitance values decreased after aging, showing an eventual blocking of the pores of the positive electrode. Therefore, the analysis of the C(V) curve was found to be an interesting tool for the interpretation of aging mechanisms.https://www.mdpi.com/2313-0105/6/4/54lithium-ion capacitorC(V) curvecapacitance evolutionstern modeldifferential capacitanceaging mechanisms |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nagham El Ghossein Ali Sari Pascal Venet |
spellingShingle |
Nagham El Ghossein Ali Sari Pascal Venet Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors Batteries lithium-ion capacitor C(V) curve capacitance evolution stern model differential capacitance aging mechanisms |
author_facet |
Nagham El Ghossein Ali Sari Pascal Venet |
author_sort |
Nagham El Ghossein |
title |
Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors |
title_short |
Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors |
title_full |
Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors |
title_fullStr |
Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors |
title_full_unstemmed |
Development of a Capacitance versus Voltage Model for Lithium-Ion Capacitors |
title_sort |
development of a capacitance versus voltage model for lithium-ion capacitors |
publisher |
MDPI AG |
series |
Batteries |
issn |
2313-0105 |
publishDate |
2020-11-01 |
description |
The capacitance of Lithium-ion Capacitors (LiCs) highly depends on their terminal voltage. Previous research found that it varies in a nonlinear manner with respect to the voltage. However, none of them modeled the capacitance evolution while considering the physicochemical phenomena that happen in a LiC cell. This paper focuses on developing a new capacitance model that is based on the Stern model of the electrochemical double layer capacitance. The model accounts for the asymmetric V-shape of the C(V) curve, which reflects the variation of the capacitance with respect to the voltage. The novelty of this study concerns the development of a model for LiCs that relies on the fundamental theory of Stern for the differential capacitance. The basic model of Stern is modified in order to account for the hybrid physicochemical structure of LiCs. Moreover, the model was applied to three aged cells to which accelerated calendar aging tests were applied at three voltage values: 2.2, 3 and 3.8 V. A drift of the voltage corresponding to the minimum capacitance was detected for the aged cells. This voltage is related to the neutral state of the positive electrode. The main cause of this phenomenon concerns the loss of lithium ions from the negative electrode of a LiC. In addition, capacitance values decreased after aging, showing an eventual blocking of the pores of the positive electrode. Therefore, the analysis of the C(V) curve was found to be an interesting tool for the interpretation of aging mechanisms. |
topic |
lithium-ion capacitor C(V) curve capacitance evolution stern model differential capacitance aging mechanisms |
url |
https://www.mdpi.com/2313-0105/6/4/54 |
work_keys_str_mv |
AT naghamelghossein developmentofacapacitanceversusvoltagemodelforlithiumioncapacitors AT alisari developmentofacapacitanceversusvoltagemodelforlithiumioncapacitors AT pascalvenet developmentofacapacitanceversusvoltagemodelforlithiumioncapacitors |
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