Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries
Rechargeable aqueous Zn-ion batteries (ZIBs) have attracted considerable attention owing to their high theoretical capacity of 820 mA h g<sup>−1</sup>, low cost and intrinsic safety. However, the electrolyte leakage and the instability issues of Zn negative electrodes originating from si...
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MDPI AG
2023-08-01
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| Online Access: | https://www.mdpi.com/2313-0105/9/8/426 |
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| author | Kehuang Wang Mingliang Shangguan Yibo Zhao Haoran Tian Fu Wang Jinliang Yuan Lan Xia |
| author_facet | Kehuang Wang Mingliang Shangguan Yibo Zhao Haoran Tian Fu Wang Jinliang Yuan Lan Xia |
| author_sort | Kehuang Wang |
| collection | DOAJ |
| description | Rechargeable aqueous Zn-ion batteries (ZIBs) have attracted considerable attention owing to their high theoretical capacity of 820 mA h g<sup>−1</sup>, low cost and intrinsic safety. However, the electrolyte leakage and the instability issues of Zn negative electrodes originating from side reactions between the aqueous electrolyte and Zn negative electrode not only restrict the battery stability, but also result in the short circuit of aqueous ZIBs. Herein, we report a flexible and stable N-isopropylacrylamide/sodium alginate (N-SA) gel electrolyte, which possesses high mechanical strength and high ionic conductivity of 2.96 × 10<sup>−2</sup> S cm<sup>−1</sup>, and enables the Zn metal negative electrode and MnO<sub>2</sub> positive electrode to reversibly and stably cycle. Compared to the liquid electrolyte, the N-SA hydrogel electrolyte can effectively form a uniform Zn deposition and suppress the generation of irreversible by-products. The assembled symmetric Zn/Zn cells at a current density of 1 mA cm<sup>−2</sup> (capacity: 1 mAh cm<sup>−2</sup>) show a stable voltage profile, which maintains a low level of about 100 mV over 2600 h without an obvious short circuit or any overpotential increasing. Specially, the assembled Zn/N-SA/MnO<sub>2</sub> batteries can deliver a high specific capacity of 182 mAh g<sup>−1</sup> and maintain 98% capacity retention after 650 cycles at 0.5 A g<sup>−1</sup>. This work provides a simple method to fabricate high-performance SA-based hydrogel electrolytes, which illustrates their potential for flexible batteries for wearable electronics. |
| first_indexed | 2024-03-11T00:07:44Z |
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| last_indexed | 2024-03-11T00:07:44Z |
| publishDate | 2023-08-01 |
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| spelling | doaj.art-acd2df6158a94077862594c9e715dd132023-11-19T00:16:06ZengMDPI AGBatteries2313-01052023-08-019842610.3390/batteries9080426Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> BatteriesKehuang Wang0Mingliang Shangguan1Yibo Zhao2Haoran Tian3Fu Wang4Jinliang Yuan5Lan Xia6Ningbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaNingbo Innovation Team on New Energies and Marine Applications, Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, ChinaRechargeable aqueous Zn-ion batteries (ZIBs) have attracted considerable attention owing to their high theoretical capacity of 820 mA h g<sup>−1</sup>, low cost and intrinsic safety. However, the electrolyte leakage and the instability issues of Zn negative electrodes originating from side reactions between the aqueous electrolyte and Zn negative electrode not only restrict the battery stability, but also result in the short circuit of aqueous ZIBs. Herein, we report a flexible and stable N-isopropylacrylamide/sodium alginate (N-SA) gel electrolyte, which possesses high mechanical strength and high ionic conductivity of 2.96 × 10<sup>−2</sup> S cm<sup>−1</sup>, and enables the Zn metal negative electrode and MnO<sub>2</sub> positive electrode to reversibly and stably cycle. Compared to the liquid electrolyte, the N-SA hydrogel electrolyte can effectively form a uniform Zn deposition and suppress the generation of irreversible by-products. The assembled symmetric Zn/Zn cells at a current density of 1 mA cm<sup>−2</sup> (capacity: 1 mAh cm<sup>−2</sup>) show a stable voltage profile, which maintains a low level of about 100 mV over 2600 h without an obvious short circuit or any overpotential increasing. Specially, the assembled Zn/N-SA/MnO<sub>2</sub> batteries can deliver a high specific capacity of 182 mAh g<sup>−1</sup> and maintain 98% capacity retention after 650 cycles at 0.5 A g<sup>−1</sup>. This work provides a simple method to fabricate high-performance SA-based hydrogel electrolytes, which illustrates their potential for flexible batteries for wearable electronics.https://www.mdpi.com/2313-0105/9/8/426Zn ion batteryaqueoushydrogel gel electrolytesodium alginateN-isopropylacrylamide |
| spellingShingle | Kehuang Wang Mingliang Shangguan Yibo Zhao Haoran Tian Fu Wang Jinliang Yuan Lan Xia Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries Batteries Zn ion battery aqueous hydrogel gel electrolyte sodium alginate N-isopropylacrylamide |
| title | Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries |
| title_full | Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries |
| title_fullStr | Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries |
| title_full_unstemmed | Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries |
| title_short | Flexible and Stable N-Isopropylacrylamide/Sodium Alginate Gel Electrolytes for Aqueous Zn-MNO<sub>2</sub> Batteries |
| title_sort | flexible and stable n isopropylacrylamide sodium alginate gel electrolytes for aqueous zn mno sub 2 sub batteries |
| topic | Zn ion battery aqueous hydrogel gel electrolyte sodium alginate N-isopropylacrylamide |
| url | https://www.mdpi.com/2313-0105/9/8/426 |
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