Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries
Redox polymers are a class of high-capacity, low-cost electrode materials for electrochemical energy storage, but the mechanisms governing their cycling stability are not well understood. Here we investigate the effect of anions on the longevity of a p-dopable polymer through comparing two aqueous z...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2022-01-01
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| Series: | eScience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667141722000027 |
| _version_ | 1828165572701978624 |
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| author | Ye Zhang Lihong Zhao Yanliang Liang Xiaojun Wang Yan Yao |
| author_facet | Ye Zhang Lihong Zhao Yanliang Liang Xiaojun Wang Yan Yao |
| author_sort | Ye Zhang |
| collection | DOAJ |
| description | Redox polymers are a class of high-capacity, low-cost electrode materials for electrochemical energy storage, but the mechanisms governing their cycling stability are not well understood. Here we investigate the effect of anions on the longevity of a p-dopable polymer through comparing two aqueous zinc-based electrolytes. Galvanostatic cycling studies reveal the polymer has better capacity retention in the presence of triflate anions than that with sulfate anions. Based on electrode microstructural analysis and evolution profiles of the cell stacking pressure, the origin of capacity decay is ascribed to mechanical fractures induced by volume change of the polymer active materials during repeated cycling. The volume change of the polymer with the triflate anion is 61% less than that with the sulfate anion, resulting in fewer cracks in the electrodes. The difference is related to the different anion solvation structures—the triflate anion has fewer solvated water molecules compared with the sulfate anion, leading to smaller volume expansion. This work highlights that anions with low solvation degree are preferable for long-term cycling. |
| first_indexed | 2024-04-12T01:47:15Z |
| format | Article |
| id | doaj.art-4fcf73a60aa348ab990538e19bf01b14 |
| institution | Directory Open Access Journal |
| issn | 2667-1417 |
| language | English |
| last_indexed | 2024-04-12T01:47:15Z |
| publishDate | 2022-01-01 |
| publisher | KeAi Communications Co. Ltd. |
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| series | eScience |
| spelling | doaj.art-4fcf73a60aa348ab990538e19bf01b142022-12-22T03:53:03ZengKeAi Communications Co. Ltd.eScience2667-14172022-01-0121110115Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteriesYe Zhang0Lihong Zhao1Yanliang Liang2Xiaojun Wang3Yan Yao4Department of Electrical and Computer Engineering, Materials Science and Engineering Program, University of Houston, Houston, TX, 77204, USA; Texas Center for Superconductivity at the University of Houston, Houston, TX, 77204, USADepartment of Electrical and Computer Engineering, Materials Science and Engineering Program, University of Houston, Houston, TX, 77204, USA; Texas Center for Superconductivity at the University of Houston, Houston, TX, 77204, USADepartment of Electrical and Computer Engineering, Materials Science and Engineering Program, University of Houston, Houston, TX, 77204, USA; Texas Center for Superconductivity at the University of Houston, Houston, TX, 77204, USADepartment of Electrical and Computer Engineering, Materials Science and Engineering Program, University of Houston, Houston, TX, 77204, USA; Texas Center for Superconductivity at the University of Houston, Houston, TX, 77204, USADepartment of Electrical and Computer Engineering, Materials Science and Engineering Program, University of Houston, Houston, TX, 77204, USA; Texas Center for Superconductivity at the University of Houston, Houston, TX, 77204, USA; Corresponding author.Redox polymers are a class of high-capacity, low-cost electrode materials for electrochemical energy storage, but the mechanisms governing their cycling stability are not well understood. Here we investigate the effect of anions on the longevity of a p-dopable polymer through comparing two aqueous zinc-based electrolytes. Galvanostatic cycling studies reveal the polymer has better capacity retention in the presence of triflate anions than that with sulfate anions. Based on electrode microstructural analysis and evolution profiles of the cell stacking pressure, the origin of capacity decay is ascribed to mechanical fractures induced by volume change of the polymer active materials during repeated cycling. The volume change of the polymer with the triflate anion is 61% less than that with the sulfate anion, resulting in fewer cracks in the electrodes. The difference is related to the different anion solvation structures—the triflate anion has fewer solvated water molecules compared with the sulfate anion, leading to smaller volume expansion. This work highlights that anions with low solvation degree are preferable for long-term cycling.http://www.sciencedirect.com/science/article/pii/S2667141722000027Aqueous batteriesPolymer electrodeAnionsVolume change |
| spellingShingle | Ye Zhang Lihong Zhao Yanliang Liang Xiaojun Wang Yan Yao Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries eScience Aqueous batteries Polymer electrode Anions Volume change |
| title | Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| title_full | Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| title_fullStr | Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| title_full_unstemmed | Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| title_short | Effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| title_sort | effect of electrolyte anions on the cycle life of a polymer electrode in aqueous batteries |
| topic | Aqueous batteries Polymer electrode Anions Volume change |
| url | http://www.sciencedirect.com/science/article/pii/S2667141722000027 |
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