Decoration of MnO Nanocrystals on Flexible Freestanding Carbon Nanofibers for Lithium Ion Battery Anodes

We demonstrate the fabrication of freestanding and flexible MnO-decorated carbon nanofiber (CNF) composites as lithium-ion battery anode materials. They showed an initial capacity of 1131mAh·g−1 and a retention capacity of 923mAh·g−1 after 90 charge-discharge cycles under a current rate of 123mA·g−1...

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Bibliographic Details
Published in:Electrochimica acta 2017-03, Vol.231, p.582-589
Main Authors: Samuel, Edmund, Jo, Hong Seok, Joshi, Bhavana, An, Seongpil, Park, Hyun Goo, Il Kim, Yong, Yoon, Woo Young, Yoon, Sam S.
Format: Article
Language:English
Subjects:
Batteries
Carbon fibers
Carbon nanofiber
Decoration
Discharge
Electrospun nanofiber
Enhanced diffusion
Felxible
Freestanding
Lithium
Lithium battery anode
Lithium-ion batteries
MnO
Nanocomposites
Nanocrystals
Nanofibers
Raman spectra
Rechargeable batteries
Spectrum analysis
Storage capacity
Studies
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Summary:We demonstrate the fabrication of freestanding and flexible MnO-decorated carbon nanofiber (CNF) composites as lithium-ion battery anode materials. They showed an initial capacity of 1131mAh·g−1 and a retention capacity of 923mAh·g−1 after 90 charge-discharge cycles under a current rate of 123mA·g−1. Decoration of MnO nanocrystals on the CNFs enhanced the lithium storage capacity of the composites. The optimal concentration of MnO was identified by varying its weight percentage from 0 to 7%. When the concentration was increased, more reaction sites for lithium ions were formed, which in turn increased the overall specific capacity. The intensity of the D band in the Raman spectra of the decorated CNFs was higher than that of the G band, indicating the enhanced diffusion of lithium ions. The plateau region of the discharge curve observed in the cases of higher MnO concentrations indicated the active reduction of MnO; consequently, a higher reversible capacity was achieved. These flexible and freestanding MnO-CNF nanocomposites can be used in lightweight, portable, and flexible batteries.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.02.077