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Preparation and Lithium Adsorption Properties of Low-dimensional Cubic Li4Mn5O12 Nanostructure

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Author(s): SUN Shu-Ying, ZHANG Qin-Hui, YU Jian-Guo

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 6;
Start page: 626;
Date: 2010;
Original page

Keywords: low-dimensional | ion-sieve | Li4Mn5O12 | adsorption | lithium

ABSTRACT
Pure β-MnO2 oxide was synthesized by hydrothermal synthesis of MnSO4H2O and (NH4)2S2O8. Spinel-type Li4Mn5O12 precursors were synthesized via low temperature solid-phase reaction. Furthermore, MnO2 ion-sieves with Li+ selective adsorption property were prepared by the acid treatment process to completely extract Li+ from the spinel Li4Mn5O12 precursor. The effects of hydrothermal and solid-phase reaction process on the nanostructure, chemical stability and ion-exchange property of the ion-sieve material were examined with XRD, HRTEM, SAED, and Li+ selective adsorption measurements. The results show that Li4Mn5O12 precursor and final MnO2 ion-sieve are effectively controlled within low-dimensional structure, indicating that low temperature solid-phase reaction is more favorable to control the nanocrystalline structure than traditional high-temperature calcination process. The Li+ selective adsorption capacity is improved remarkably to 6.6 mmol/g at equilibrium and about 5.0 mmol/g at the initial Li+ concentration of only 5.0 mmol/L, which is significant for lithium extraction from aqueous solutions with very low lithium content.

Tango Jona
Tangokurs Rapperswil-Jona

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