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由固相法合成了不同Sb/Mn摩尔比的系列Li-Sb-Mn复合氧化物,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和原子吸收分光光度计(AAS)分别表征了其结构、形貌和锂离子脱出/吸附性能。XRD和SEM分析表明,Li-Sb-Mn复合氧化物随着Sb/Mn摩尔比从0.05提高到1.00,晶型由尖晶石型转变为正交相。Li+脱出/吸附实验表明,不同Sb/Mn配比的复合氧化物都可以作为锂无机吸附剂。其中,酸浸改型后的尖晶石锂锑锰复合氧化物(n(Sb)/n(Mn)=0.05)在含锂溶液中具有较高的锂离子吸附容量,达到33.23mg/g。Sb/Mn摩尔比是决定该复合氧化物的结构和脱Li+/吸Li+性能的主要因素。
A series of Li-Sb-Mn composite oxides with different molar ratios of Sb / Mn were synthesized by solid state reaction. Their structures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic absorption spectrophotometer Its structure, morphology and lithium ion extraction / adsorption properties. XRD and SEM analysis showed that the Li-Sb-Mn composite oxide transformed from spinel to orthorhombic phase as the Sb / Mn molar ratio increased from 0.05 to 1.00. Li + desorption / adsorption experiments show that different Sb / Mn composite oxide can be used as a lithium inorganic adsorbent. Among them, acid-modified modified spinel lithium antimony-manganese composite oxide (n (Sb) / n (Mn) = 0.05) had higher lithium ion adsorption capacity in the lithium-containing solution, reaching 33.23mg / g. The Sb / Mn molar ratio is a major factor that determines the structure of the composite oxide and de-Li + / Li + absorption properties.