A study about γ-MnOOH nanowires as anode materials for rechargeable Li-ion batteries

► Manganite nanowires were tested as the anode materials for Li-ion batteries. ► The OH– ions present in γ-MnOOH do not interfere with the lithium uptake and extraction. ► The capacity of this material stabilizes at about 400mAhg−1 after 20 cycles. ► The working mechanism for the first discharge may...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-02, Vol.550, p.185-189
Main Authors: Lou, Xiaoming, Wu, Xiaozhen, Zhang, Youxiang
Format: Article
Language:English
Subjects:
Amorphous materials
Anode electrode
Anodes
Applied sciences
Chemistry
Conversion reaction
Discharge
Electrochemistry
Electrodes
Electrodes: preparations and properties
Energy
Energy. Thermal use of fuels
Exact sciences and technology
General and physical chemistry
Lithium-ion batteries
Manganese
Manganite
Manganites
Nanowires
Transport and storage of energy
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Summary:► Manganite nanowires were tested as the anode materials for Li-ion batteries. ► The OH– ions present in γ-MnOOH do not interfere with the lithium uptake and extraction. ► The capacity of this material stabilizes at about 400mAhg−1 after 20 cycles. ► The working mechanism for the first discharge may be: γ-MnOOH+3Li++3e-→Mn+Li2O+LiOH. ► The working mechanism for the following cycles may be: Li2O+3/4Mn↔2Li++1/4Mn3O4+2e-. Manganite (γ-MnOOH) nanowires have been synthesized using a hydrothermal method and their electrochemical properties as the anode materials for rechargeable Li-ion batteries have been measured. The results show that the hydroxide ions present in γ-MnOOH do not interfere with the lithium uptake and extraction, making the manganite nanowires able to reversibly react with large amount of Li. The working mechanism of γ-MnOOH as the anode active material for rechargeable Li-ion batteries is examined by TEM and the corresponding SAEDs, and is confirmed to be conversion reactions: during the first discharge, the γ-MnOOH nanowires are reduced into clusters of metallic Mn embedded in an amorphous matrix of Li2O and LiOH; the subsequent cycles are reversible redox reactions between metallic Mn and Mn3O4 nanoparticles. The discharge capacity is 1660mAhg−1 for the first cycle and can stabilize at about 400mAhg−1 after 20 cycles, which implies that this material can also be a candidate for the anode electrodes for Li-ion batteries.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2012.09.124