Abstract
Aqueous manganese ion batteries (AMIBs) have recently garnered attention due to the abundance of manganese and their intrinsic safety. However, the development of current AMIBs remains plagued by restrictive actual capacities. Herein, we propose an energetic Mn2+-S redox electrochemistry with a solid-liquid-solid redox pathway. Operando X-ray absorption fine spectroscopy and synchrotron X-ray diffraction unveil the Mn2+ storage mechanism of S8 ↔ MnS4 ↔ MnS2 ↔ MnS. A capacity of 1,242 mAh g−1 with a high sulfur utilization of 74.3 wt % can be achieved, surpassing the capacity limitations of previously reported AMIBs. As a proof of concept, a system intergrating the S/MnS and MnO2/Mn2+ redox couples delivers an energy density of 396 Wh kgS+MnO2−1 and cycles for 800 cycles stably at 4 A g−1. We have elucidated the mechanism underlying the redox of Mn2+-S and may open an avenue for the next high-energy AMIBs.
Original language | English |
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Article number | 101930 |
Journal | Joule |
DOIs | |
Publication status | Accepted/In press - 2025 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2025 Elsevier Inc.
ASJC Scopus Subject Areas
- General Energy
Keywords
- aqueous battery
- manganese ion battery
- Mn-S redox
- PVA membrane
- reaction kinetics
- sulfur-based aqueous battery