NDLI: Direct conversion of electrodeposited nanocrystalline ε-MnO2 into LiMn2O4 by microwave calcination

Content Provider	Springer Nature Link
Author	Davoglio, Rogério Aparecido Irikura, Kallyni Biaggio, Sonia R. Bocchi, Nerilso Rocha Filho, Romeu C.
Copyright Year	2016
Abstract	Firstly, ε-MnO2 films with good adhesion and high surface area were electrolytically deposited on platinum plates. After being soaked for 48 h in a 0.1 mol L−1 LiOH aqueous solution, these oxide films were directly converted to the LiMn2O4 spinel by microwave calcination using very short irradiation times (t ir) of 3, 4, or 5 min. As inferred from XRD data, clearly the crystalline LiMn2O4 spinel in a single phase can be obtained even at t ir = 3 min. The voltammetric profiles for all obtained Pt/LiMn2O4 electrodes presented the characteristic peaks for the lithium-ion insertion-extraction processes in the spinel structure. For the LiMn2O4 spinel obtained using t ir = 3 min, the diffusion coefficient associated to those processes was estimated as equal to 1.1 × 10−11 cm s−1. From the charge-discharge tests, the specific capacity for this material was about 80 mA h g−1 at C/10. Therefore, the proposed methodology made possible to directly produce Pt/LiMn2O4 electrodes, without the need of using conductivity enhancers or binders for the attachment of the oxide film to the current collector.
Starting Page	2019
Ending Page	2027
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	20
Issue Number	7
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-04-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LiMn2O4 preparation Microwave conversion Electrolytic ε-MnO2 Microwave-assisted solid-state reaction Lithium-ion batteries Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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