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| Pàgina inicial > Articles > Articles publicats > Improved Mn4+/Mn2+ Contribution in High-Voltage Zn-MnO2 Batteries Enabled by an Al3+-Ion Electrolyte |
(Institut de Recerca en Energia de Catalunya) (Institut de Recerca en Energia de Catalunya) (Institut de Recerca en Energia de Catalunya) (Institut Català de Nanociència i Nanotecnologia) (Chinese Academy of Sciences. Shenzhen Institute of Advanced Technology) (China Jiliang University. College of Metrology Measurement and Instrument) (Chengdu University. Institute for Advanced Study) (Chinese Academy of Sciences. Shenzhen Institute of Advanced Technology) (Institut de Recerca en Energia de Catalunya) (Institut Català de Nanociència i Nanotecnologia) (Institut de Recerca en Energia de Catalunya)
| Data: | 2024 |
| Resum: | Rechargeable aqueous Zn-MnO2 batteries are attracting attention as a cost-effective and safe energy storage solution, but their commercialization faces challenges due to limited stability, output voltage, and energy density. Herein, a hybrid-ion Zn-MnO2 system with enhanced Mn4+/Mn2+ electrochemical contribution is introduced using an Al3+-based electrolyte. Compared with conventional Zn2+ electrolytes, the hybrid Al3+/Zn2+ cell offers higher output voltage of 1. 75 V, capacities up to 469 mAh g−1, and outstanding energy densities up to ≈730 Wh kg−1 at 0. 3 A g−1. Besides, the Al3+-enabled Zn-MnO2 battery shows 100% capacity and energy density retention after 10,000 cycles at 2 A g−1. Even at a high mass-loading of 6. 2 mg cm−2, a capacity of ≈200 mAh g−1 is maintained for over 100 cycles. This outstanding performance is related to the contribution of different intercalation and reaction mechanisms, as proved by the combination of electrochemical analysis and ex-situ x-ray diffraction characterization of the cells at different discharge stages. Al3+ ions, as Lewis strong acid, contribute to capacity in two significant ways: through a highly reversible intercalation/de-intercalation that substantially boosts capacitance at low current rates, and promoting the Mn4+/Mn2+ reaction aided by H+ that dominates the capacitance at higher current rates. Overall, this work demonstrates a practical Zn-MnO2 battery with a high potential for low-cost stationary energy storage habilitated by multiple ion co-intercalation. |
| Ajuts: | Agencia Estatal de Investigación PID2022-136883OB-C22 European Commission 964524 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-01581 Agencia Estatal de Investigación PID2020-116093RB-C43 Agencia Estatal de Investigación CEX2021-001214-S |
| Nota: | Altres ajuts: CERCA Programme/Generalitat de Catalunya; This study is part of the Advanced Materials programme and was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) |
| Drets: | Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió acceptada per publicar |
| Matèria: | Al-ion ; Mn4+/Mn2+ reaction ; Hybrid ions ; Zn-MnO2 battery ; Zn-ion battery ; MnO2 |
| Publicat a: | Advanced Energy Materials, Vol. 14, Issue 48 (December 2024) , art. 2402584, ISSN 1614-6840 |
Postprint |
