Microwave assisted synthesis for ϵ-MnO2 nanostructures on Ni foam as for rechargeable Li–O2 battery applications

Lithium-air batteries exhibits high practical energy densities ranging from 1000 to 4000 Wh Kg−1, rendering them appealing for applications in portable electronic devices and electric vehicles. Nevertheless, they grapple with challenges like low charge–discharge efficiency, limited stability over mu...

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Bibliographic Details
Published in:Nano express 2023-12, Vol.4 (4), p.045004
Main Authors: Rao, R Prasada, Ramasubramanian, B, Saritha, R, Ramakrishna, S
Format: Article
Language:English
Subjects:
Additives
battery
cathode catalysts
Charge efficiency
diffusion
Discharge
Electric vehicles
Electrochemical analysis
Electrodes
Energy storage
Lithium
Manganese dioxide
Metal air batteries
Metal foams
MnO2/Ni electrode
Nanostructure
Portable equipment
Rechargeable batteries
Stability
Synthesis
volume defects
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Summary:Lithium-air batteries exhibits high practical energy densities ranging from 1000 to 4000 Wh Kg−1, rendering them appealing for applications in portable electronic devices and electric vehicles. Nevertheless, they grapple with challenges like low charge–discharge efficiency, limited stability over multiple cycles, and electrode degradation stemming from undesirable side reactions, thus impeding their commercial market. In this study, ϵ-MnO2 petal-like nanostructures were synthesized on Ni foam via simple, microwave-assisted synthesis approach. The resulting ϵ-MnO2/Ni electrode demonstrated storage capacities (1982 mAh g−1 discharge capacity at 200 mA g−1) alongside enhanced cyclability and stability over 100 cycles, independent of discharge depth. This electrochemical performance can be attributed to its 3D morphology, oxygen defects, and the absence of side reactions from carbon-based additives. Overall, ϵ-MnO2/Ni electrode catalysts hold potential for realizing cost-effective Li-O2 based energy storage technologies.
ISSN:2632-959X
DOI:10.1088/2632-959X/acfe26