Correlation between Li + adsorption capacity and the preparation conditions of spinel lithium manganese precursor

Abstract

Spinel lithium manganese oxides can be used as Li + adsorbent with topotactical extraction of lithium. In this paper, the solid state methods were introduced to prepare spinel lithium manganese precursors with Li 2CO 3 and LiOH·H 2O as different Li sources. The Li + uptake was studied to clarify the correction between Li + adsorption capacity and the preparation conditions of precursors, including different Li sources, Li/Mn mole ratios and heating time. The results indicated that the Li +-extracted materials prepared with LiOH·H 2O and MnCO 3 usually have higher Li + adsorption capacity than Li 2CO 3 and MnCO 3, and an ascending trend was found in Li + uptake with increasing Li/Mn mole ratio in the preparation of the precursor, but it is not proportional. The Mn 2O 3 impurities could be the primary reason for decreasing Li + adsorption capacity. Furthermore, it is concluded that the Li +-extracted materials obtained from spinel manganese oxides synthesized with Li/Mn = 1.0 can serve as selective Li + absorbents due to its high selectivity and large adsorption capacity.