A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes
Abstract The transition to Ni‐based battery cathodes enhances the energy density and reduces the cost of batteries. However, this comes at the expense of losing energy efficiency which could be a consequence of charge–discharge hysteresis. Here, a thermodynamic model is developed to understand the e...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2023-04-01
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| Series: | ChemElectroChem |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/celc.202201118 |
| _version_ | 1797807384691736576 |
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| author | Keyvan Malaie Fritz Scholz Uwe Schröder |
| author_facet | Keyvan Malaie Fritz Scholz Uwe Schröder |
| author_sort | Keyvan Malaie |
| collection | DOAJ |
| description | Abstract The transition to Ni‐based battery cathodes enhances the energy density and reduces the cost of batteries. However, this comes at the expense of losing energy efficiency which could be a consequence of charge–discharge hysteresis. Here, a thermodynamic model is developed to understand the extent and origin of charge–discharge hysteresis in battery cathodes based on their cyclic voltammograms (CVs). This was possible by defining a Gibbs energy function that weights random ion insertion/expulsion, i. e., a solid solution pathway, against selective ion insertion/expulsion, i. e., a phase separation route. The model was verified experimentally by the CVs of CoOOH and Ni(OH)2 as solid‐solution and phase‐separating cathodes, respectively. Finally, a microscopic view reveals that phase separation and hysteresis are a consequence of large ionic radii difference of the reduced and oxidized central metal atoms. |
| first_indexed | 2024-03-13T06:21:41Z |
| format | Article |
| id | doaj.art-6590a2fa6cb04f338cd6af00a10046bf |
| institution | Directory Open Access Journal |
| issn | 2196-0216 |
| language | English |
| last_indexed | 2024-03-13T06:21:41Z |
| publishDate | 2023-04-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | ChemElectroChem |
| spelling | doaj.art-6590a2fa6cb04f338cd6af00a10046bf2023-06-09T18:22:04ZengWiley-VCHChemElectroChem2196-02162023-04-01107n/an/a10.1002/celc.202201118A Thermodynamic Model for the Insertion Electrochemistry of Battery CathodesKeyvan Malaie0Fritz Scholz1Uwe Schröder2Institute of Biochemistry University of Greifswald Felix-Hausdorff-Str. 4 17487 Greifswald GermanyInstitute of Biochemistry University of Greifswald Felix-Hausdorff-Str. 4 17487 Greifswald GermanyInstitute of Biochemistry University of Greifswald Felix-Hausdorff-Str. 4 17487 Greifswald GermanyAbstract The transition to Ni‐based battery cathodes enhances the energy density and reduces the cost of batteries. However, this comes at the expense of losing energy efficiency which could be a consequence of charge–discharge hysteresis. Here, a thermodynamic model is developed to understand the extent and origin of charge–discharge hysteresis in battery cathodes based on their cyclic voltammograms (CVs). This was possible by defining a Gibbs energy function that weights random ion insertion/expulsion, i. e., a solid solution pathway, against selective ion insertion/expulsion, i. e., a phase separation route. The model was verified experimentally by the CVs of CoOOH and Ni(OH)2 as solid‐solution and phase‐separating cathodes, respectively. Finally, a microscopic view reveals that phase separation and hysteresis are a consequence of large ionic radii difference of the reduced and oxidized central metal atoms.https://doi.org/10.1002/celc.202201118CobaltHysteresisIon insertionNickelPhase transition |
| spellingShingle | Keyvan Malaie Fritz Scholz Uwe Schröder A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes ChemElectroChem Cobalt Hysteresis Ion insertion Nickel Phase transition |
| title | A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes |
| title_full | A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes |
| title_fullStr | A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes |
| title_full_unstemmed | A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes |
| title_short | A Thermodynamic Model for the Insertion Electrochemistry of Battery Cathodes |
| title_sort | thermodynamic model for the insertion electrochemistry of battery cathodes |
| topic | Cobalt Hysteresis Ion insertion Nickel Phase transition |
| url | https://doi.org/10.1002/celc.202201118 |
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