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| Role of Process Parameters on Phase Purity of o-LiMnO2 and Synthesis of Li1.6Mn1.6O4 as Lithium Ion-Sieve |
| Author Name | Affiliation | E-mail | | FU Yu-Yao | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | YANG Xi-Yun | School of Metallurgy and Environment, Central South University, Changsha 410083, China | yxy7412@csu.edu.cn | | HUANG Hai-Qiang | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | WANG Yuan-Yuan | School of Metallurgy and Environment, Central South University, Changsha 410083, China | | | LI Ji-Shen | School of Metallurgy and Environment, Central South University, Changsha 410083, China | |
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| Abstract: Spinel Li1.6Mn1.6O4 was synthesized by hydrothermal oxidation of MnSO4 with KMnO4 to form LiMnO2 following solid-phase roasting. Acid pickling transforms Li1.6Mn1.6O4 to lithium ion-sieve. The effects of hydrothermal temperature, oxygen and molar ratio of MnO4- to Mn2+ (nMnO4-:nMn2+) on LiMnO2 composition and the dissolution percentage of manganese from Li1.6Mn1.6O4 during acid pickling were investigated. Open circuit potential measurement and chemical analysis indicate that oxygen in the air has involved in the hydrothermal reaction to produce LiMnO2 accompanied by formation of Li2MnO3 and LiMn2O4 impurities at a theoretical nMnO4-:nMn2+ of 1:4. Pure orthogonal LiMnO2 (o-LiMnO2) was obtained with a molar ratio of MnO4-to Mn2+ of 1:6 at 160℃. The Li+ adsorption capacity in salt lake brine was 42.87 mg·g-1. The lithium ion-sieve showed excellent adsorption selectivity toward Li+ in salt lake brine and followed a chemical adsorption process. The adsorption capacity remained at 37.21 mg·g-1 and the dissolution percentage of manganese decreased to 0.34% after 5 cycles. |
| Keywords: hydrothermal synthesis spinel phase ion-sieve Li1.6Mn1.6O4 Li adsorption |
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| FU Yu-Yao,YANG Xi-Yun,HUANG Hai-Qiang,WANG Yuan-Yuan,LI Ji-Shen.Role of Process Parameters on Phase Purity of o-LiMnO2 and Synthesis of Li1.6Mn1.6O4 as Lithium Ion-Sieve[J].Chinese Journal of Inorganic Chemistry,2020,36(3):536-546. |
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