Preparation and Selective Lithium Extraction from Li2Mn1-xTixO4 (x.LEQ.0.5) in an H2SO4 Solution
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概要
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A series of Li<SUB>2</SUB>Mn<SUB>1-x</SUB>Ti<SUB>x</SUB>O<SUB>4</SUB> (x≤0.5) samples was prepared by solid-state region at 850°C. Selective lithium extraction from Li<SUB>2</SUB>Mn<SUB>0.5</SUB>Ti<SUB>0.5</SUB>O<SUB>4</SUB> was studied by chemical analysis and XRD and TG-DTA measurements. The lithium exaction from Li<SUB>2</SUB>Mn<SUB>0.5</SUB>Ti<SUB>0.5</SUB>O<SUB>4</SUB> was carried out in H<SUB>2</SUB>SO<SUB>4</SUB> solutions with different mole ratios of H<SUP>+</SUP> in the solution to Li<SUP>+</SUP> in the solid ( [H<SUP>+</SUP>] <SUB>l</SUB>/ [Li<SUP>+</SUP>] <SUB>s</SUB>) at 50°C. The lithium extraction was found to proceed through a mechanism of Li<SUP>+</SUP>/H<SUP>+</SUP> ion exchange when ( [H<SUP>+</SUP>] <SUB>l</SUB>/ [Li<SUP>+</SUP>] <SUB>s</SUB>) ≤0.2, accompanied by a lithium dissolution process when ( [H<SUP>+</SUP>] <SUB>l</SUB>/ [Li<SUP>+</SUP>] <SUB>s</SUB>) ≥0.4. The lithium-extracted product retains the monoclinic structure of Li<SUB>2</SUB>Mn<SUB>0.5</SUB>Ti<SUB>0.5</SUB>O<SUB>4</SUB>.
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