Synthesis of high-purity LiMn2O4 with enhanced electrical properties from electrolytic manganese dioxide treated by sulfuric acid-assisted hydrothermal method

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DOIResolve DOI: http://doi.org/10.1007/s10008-013-2199-8
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TypeArticle
Journal titleJournal of Solid State Electrochemistry
ISSN1432-8488
Volume17
Issue11
Pages28492856; # of pages: 8
SubjectCath-ode materials; Electrochemical reactions; Electrolytic manganese dioxides; High-temperature solid-phase; Lithium-ion battery; Lithium-ion battery cathodes; Spinel lithium manganese oxides; Sulfuric acid-assisted hydrothermal; Cathodes; Crystal impurities; Cyclic voltammetry; Diffusion; Electric properties; Electrochemical impedance spectroscopy; Lithium; Lithium alloys; Lithium batteries; Lithium compounds; Oxides; Scanning electron microscopy; Sulfuric acid; X ray diffraction; Manganese oxide
AbstractUsing sulfuric acid-assisted hydrothermal treatment, β-MnO2 particles were obtained from the electrolytic manganese dioxide (EMD). Via high-temperature solid-phase reactions, spinel lithium manganese oxides (LiMn2O4) were produced using the obtained β-MnO 2 particles as precursor mixed with LiOH·H2O for the lithium-ion battery cathodes. Atomic absorption (AAS) shows that after the hydrothermal treatment, the contents of impurity ions, such as Na+, K+, Ca2+, and Mg2+, caused by the limitation of preparation technology of EMD are greatly reduced. X-ray diffraction and scanning electron microscopy show that β-MnO2 is highly alloyed consisting of nano sticks. Spinel lithium manganese (LiMn2O 4) synthesized by the β-MnO2 precursor has high crystallinity with a well 111 face grow and presents a regular and micron-sized octagonal crystal. When used as cathode materials for lithium-ion batteries, LiMn2O4 synthesized by the β-MnO2 precursor has greater discharge capacity, better cycle performance, and better high-rate capability when compared with LiMn2O4 synthesized by the EMD precursor. Cyclic voltammetry and electrochemical impedance spectroscopy indicate that LiMn2O4 synthesized by the β-MnO2 precursor has better electrochemical reaction reversibility, greater peak current, higher lithium-ion diffusion coefficient, and lower electrochemical impedance. © 2013 Springer-Verlag Berlin Heidelberg.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270619
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Record identifier4f9cfbbf-04a8-415e-b9a5-295ce21816fc
Record created2014-02-17
Record modified2016-05-09
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