Abstract
Al-doped LiAlxMn2-xO4 ion-sieves were optimally synthesized with improved structural stability for Li+ adsorption through hydrothermal synthesis method. Firstly, several parameters including the Al3+ doping content x, hydrothermal temperature, hydrothermal treatment time and calcination temperature were investigated to optimize the synthesis of LiAlxMn2-xO4 ion-sieves for selecting unique spinel structure with low dissolution loss (R) for Li+ adsorption. Then, the pristine LiMn2O4 (LMO) and optimized LiAl0.1Mn1.9O4 (LAMO) ion-sieves were comparatively investigated from their microstructure and chemical state to Li+ adsorption performance. The desorption ratio of Li+, adsorption capacity (Q) and the dissolution losses (RMn2+ and RAl3+) of the ion-sieves were evaluated by adsorption-desorption experiments. It was found that the maximum equilibrium adsorption capacity QLAMO was 27.66 mg g−1 and the desorption ratio of Li+ could reach 81.2% after 120 min. Meanwhile, RMn2+ and RAl3+ of LAMO ion-sieve were very low in the desorption process. Moreover, LAMO ion-sieve also shows excellent stability and repeatability that the LAMO could still maintain a high adsorption capacity (19.5 mg g−1) with very low RMn2+ (3.71%) and negligible RAl3+ after repeating 5 times adsoprtion-desorption operation.
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