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Synthesis and Properties of Lithium Ion-sieve Precursor Li4Mn5O12

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Author(s): XU Hui, CHEN Chang-Guo, SONG Ying-Hua

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 7;
Start page: 720;
Date: 2013;
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Keywords: ion-sieve; Li4Mn5O12; precursor; adsorption

ABSTRACT
Adsorption method is the most promising method for extraction of lithium from salt lakes. A new kind of MnO2 ion-sieves with high Li+ selective adsorption property were synthesized. Spinel-type Li4Mn5O12 precursors were synthesized by EDTA-citrate complexing method using LiNO3 and Mn(NO3)2·4H2O as starting materials. MnO2 ion-sieves with Li+ selective adsorption property were prepared by the acid treatment process to extract Li+ from the spinel Li4Mn5O12 precursors. As-prepared samples were characterized by thermo gravimetric, XRD, SEM, FT-IR and Li+ selective adsorption measurements, respectively. The results show that calcination time has a considerable effect on the structure and composition of precursors. The precursor calcined at 400¡æ for 24 h has a pure phase of Li4Mn5O12. Final MnO2 ion-sieve and Li4Mn5O12 precursor are about 200 nm spherical pellets and have the same structure of spinel. The maximum adsorption capacity of ion-sieve is about 43.1 mg/g and has the good selection for Li+.
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