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- Title
High-Performance Aqueous Zinc–Manganese Battery with Reversible Mn<sup>2+</sup>/Mn<sup>4+</sup> Double Redox Achieved by Carbon Coated MnO<sub>x</sub> Nanoparticles.
- Authors
Huang, Jingdong; Zeng, Jing; Zhu, Kunjie; Zhang, Ruizhi; Liu, Jun
- Abstract
Highlights: Aqueous zinc-manganese batteries with reversible Mn2+/Mn4+ double redox are achieved by carbon-coated MnOx nanoparticles. Combined with Mn2+-containing electrolyte, the MnOx cathode achieves an ultrahigh energy density with a peak of 845.1 Wh kg−1 and an ultralong lifespan of 1500 cycles. The electrode behaviors and reaction mechanism are systematically discussed by combining electrochemical measurements and material characterization. There is an urgent need for low-cost, high-energy-density, environmentally friendly energy storage devices to fulfill the rapidly increasing need for electrical energy storage. Multi-electron redox is considerably crucial for the development of high-energy-density cathodes. Here we present high-performance aqueous zinc–manganese batteries with reversible Mn2+/Mn4+ double redox. The active Mn4+ is generated in situ from the Mn2+-containing MnOx nanoparticles and electrolyte. Benefitting from the low crystallinity of the birnessite-type MnO2 as well as the electrolyte with Mn2+ additive, the MnOx cathode achieves an ultrahigh energy density with a peak of 845.1 Wh kg−1 and an ultralong lifespan of 1500 cycles. The combination of electrochemical measurements and material characterization reveals the reversible Mn2+/Mn4+ double redox (birnessite-type MnO2 ↔ monoclinic MnOOH and spinel ZnMn2O4 ↔ Mn2+ ions). The reversible Mn2+/Mn4+ double redox electrode reaction mechanism offers new opportunities for the design of low-cost, high-energy-density cathodes for advanced rechargeable aqueous batteries.
- Subjects
ELECTRICAL energy; ENERGY density; OXIDATION-reduction reaction; ELECTRODE reactions; ALKALINE batteries; ENERGY storage; ZINC electrodes; AQUEOUS electrolytes
- Publication
Nano-Micro Letters, 2020, Vol 12, Issue 1, pN.PAG
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-020-00445-x