文献类型：期刊文献

英文题名：Semi-wet synthesis of high-performance Li 1.6 Mn 1.6 O 4 for selective lithium extraction from Salt Lakes Brine

作者：Bao, Lu-Ri[1];Tang, Wei-Ping[2];Sun, Shu-Ying[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Chinese Acad Sci, Key Lab Green & High End Utilizat Salt Lake Resour, Shanghai 200245, Peoples R China

年份：2024

卷号：584

外文期刊名：DESALINATION

收录：;EI(收录号：20242116112469);WOS:【SCI-EXPANDED(收录号:WOS:001243433600001)】；

基金：Acknowledgments The research was supported by NSFC (U20A20142) and sponsored by Shanghai Pujiang Program (2019PJD011) .

语种：英文

外文关键词：Lithium adsorption selectivity; OrthorhombicLiMnO2; Control of oxidation environment; Ion-sieve; Structural stability

摘要：Among the manganese -based lithium -ion sieves, Li 1.6 Mn 1.6 O 4 has a high theoretical lithium adsorption capacity as a spinel ion sieve material. Small particle size orthogonal phase purity LiMnO 2 powders were prepared by a semi -wet method and calcined in air at 400 degrees C to obtain Li 1.6 Mn 1.6 O 4 a lithium -ion sieve precursor. The synergistic effects of oxygen atmosphere, heat treatment conditions and lithium/manganese molar ratio on the crystal structure of LiMnO 2 and the lithium adsorption/desorption characteristics of Li 1.6 Mn 1.6 O 4 were comprehensively investigated with XRD, SEM, TEM, XPS, Raman, DTA-TG and capacity retention study. Notably, when the initial lithium/manganese molar ratio was set at 1.1, and the sample underwent a calcination at 120 degrees C for 48 h under carefully controlled deoxygenation conditions, we observed the exclusive presence of the desired orthorhombic phase in the LiMnO 2 sample. In contrast, when the synthesis conditions deviated from the optimized parameters led to the presence of the monoclinic phase of Li 2 MnO 3 . This highlights the sensitivity of Li 1.6 Mn 1.6 O 4 properties to the synthesis conditions. The results of adsorption -desorption cycles show that the ion sieve Li 1.6 Mn 1.6 O 4 prepared by heat treatment of ordered o-LiMnO 2 is more stable, the structural stability of Li 1.6 Mn 1.6 O 4 were characterized by high -temperature in -situ XRD experiments during heating from 30 to 800 degrees C. The equilibrium adsorption capacity was 34 mg g -1 in Qarhan Salt Lake brine at 10th cycle, and a remarkably low Mn dissolution loss rate of 0.6 %. The results have significant potential to advance the development of highperformance adsorbent in the Li-Mn-O system and contribute to the advances in lithium separation technology.