All‐Solid‐State, Foldable, and Rechargeable Zn‐Air Batteries Based on Manganese Oxide Grown on Graphene‐Coated Carbon Cloth Air Cathode

Pliable, safe, and inexpensive energy storage devices are in demand to power modern flexible electronics. In this work, a foldable battery based on a solid‐state and rechargeable Zn‐air battery is introduced. The air cathode is prepared by coating graphene flakes on pretreated carbon cloth to form a...

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Bibliographic Details
Published in:Advanced energy materials 2017-10, Vol.7 (20), p.n/a
Main Authors: Sumboja, Afriyanti, Lübke, Mechthild, Wang, Yong, An, Tao, Zong, Yun, Liu, Zhaolin
Format: Article
Language:English
Subjects:
bifunctional catalysts
Carbon
Cathodes
Cathodic polarization
Cloth
Cycles
Energy storage
Flakes
flexible batteries
Graphene
Manganese oxides
Metal air batteries
Oxide coatings
Rechargeable batteries
Solid state
solid‐state batteries
Zinc-oxygen batteries
Zn‐air batteries
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Summary:Pliable, safe, and inexpensive energy storage devices are in demand to power modern flexible electronics. In this work, a foldable battery based on a solid‐state and rechargeable Zn‐air battery is introduced. The air cathode is prepared by coating graphene flakes on pretreated carbon cloth to form a dense, interconnected, and conducting carbon network. Manganese oxide hierarchical nanostructures are subsequently grown on the large surface area carbon network, leading to high loading of active catalyst per unit volume while maintaining the mechanical and electrical integrity of the air cathode. Solid‐state and rechargeable Zn‐air battery with such air cathode exhibits similar polarization curve and resistance at its flat and folded states. The folded battery is able to deliver a power density as high as ≈32 mW cm−2 and good cycling stability of up to 110 cycles. In addition, the flat battery shows similar discharge/charge curve and stable cycling performance after 100 times of repeated folding and unfolding, indicating its high mechanical robustness. Foldable Zn‐air batteries based on MnOx grown on graphene‐coated carbon cloth air cathode have low charge voltage and high discharge voltage. Random coating of graphene flakes provides more active sites to grow MnOx, as well as conducting network and mechanical support for air cathode. The batteries survive over 100 times of continuously folding and unfolding with minimal performance degradation.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201700927