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The beneficial effect of nanocrystalline and amorphous nature on the anode performance of manganese oxide for lithium ion batteries

Title
The beneficial effect of nanocrystalline and amorphous nature on the anode performance of manganese oxide for lithium ion batteries
Authors
Oh, Seung MiKim, In YoungAdpakpang, KanyapornHwang, Seong-Ju
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2015
Journal Title
ELECTROCHIMICA ACTA
ISSN
0013-4686JCR Link1873-3859JCR Link
Citation
vol. 174, pp. 391 - 399
Keywords
NanocrystalsAmorphous materialAnodeLithium ion batteriesEnergy storage
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The effect of the amorphous structure and nanocrystalline nature of metal oxide on its anode performance in lithium ion batteries is investigated with two nanocrystalline and one well-crystallized layered manganese oxides. X-ray amorphous manganese oxide nanocrystals are synthesized by soft-chemical redox reactions using reducing agents of KBH4 and LiI at room temperature, whereas well-crystallized layered manganese oxide is obtained by solid state reaction at elevated temperature. Although both of the amorphous manganese oxides lack a long-range structural order, they are crystallized with a layered MnO2-type local structure, which is nearly identical to the crystal structure of the well-crystallized K0.45MnO2. In comparison with the well-crystallized K0.45MnO2, both the amorphous manganese oxides commonly possess smaller particle sizes with larger surface areas and better homogeneity of composite structure. The amorphous manganese oxide nanocrystals show better anode performance with greater discharge capacity for lithium ion batteries than does the well-crystallized K0.45MnO2, which is attributable to the greater surface area, higher structural and electrochemical stability, more homogeneous composite structure, and better charge-transfer characteristics of the amorphous materials. This result highlights the merit of the nanocrystalline and amorphous nature for optimizing the electrode performance of manganese oxide. The present solution-based redox reaction can provide a facile, economic, and scalable route for synthesizing efficient manganese-based anode materials for lithium ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.electacta.2015.06.014
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자연과학대학 > 화학·나노과학전공 > Journal papers
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