文献类型：期刊文献

英文题名：Lithium extraction/insertion process on cubic Li-Mn-O precursors with different Li/Mn ratio and morphology

作者：Sun, Shu-Ying[1];Song, Xingfu[1];Zhang, Qin-Hui[1];Wang, Jin[1];Yu, Jian-Guo[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：17

期号：5

起止页码：881

外文期刊名：ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY

收录：;EI(收录号：20113814342851);WOS:【SCI-EXPANDED(收录号:WOS:000294811600014)】；

基金：This work is supported by NSFC (20906022).

语种：英文

外文关键词：Lithium; Spinel Li-Mn-O precursor; Adsorption; Ion-sieve; Morphology

摘要：The cubic phase LiMn(2)O(4) precursors are prepared by high-temperature calcinations (1003 K) of LiOHa <...H(2)O and MnO(2) mixture with Li/Mn molar ratio = 0.55. The Li(4)Mn(5)O(12) precursors are synthesized via low-temperature solid-phase reaction (673 K) of LiNO(3) and MnO(2) mixture with Li/Mn molar ratio = 1.0. The ion-sieves counterparts (named SMO-H and SMO-L, respectively) are obtained by the acid treatment of Li-Mn-O precursors. The structure, chemical stability, morphology, ion-exchange property and mechanism of Li-Mn-O precursors and MnO(2) ion-sieve were systematically examined via X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), Infrared Spectroscopy (IR), X-ray photoelectron spectroscopy (XPS) and lithium ion selective adsorption measurements. The result shows the more compact Mn-O lattice makes the Li(4)Mn(5)O(12) spinel more stable after the Li(+) is extracted. The results of IR and XPS show adsorption process of SMO-H exists ion-exchange between the Li(+) and protons, and redox reaction, but only exists ion-exchange between the Li(+) and protons in SMO-L. Agglomeration is well-improved by low calcination temperature and the morphology of the Li(4)Mn(5)O(12) precursor and final MnO(2) ion-sieve are effectively controlled within low-dimensional structure. The maximum pH titration capacity of SMO-L for Li(+) is 6.76 mmola <...g(-1), but only 3.47 mmola <...g(-1) for SMO-H. The ion-sieve obtained from Li(4)Mn(5)O(12) precursor is promising in the lithium extraction from brine or seawater.