The Formation of Manganese Carboxylates from MnO and MnO2 and their Application in Lithium Manganate Precursors: X-Ray Crystal Structure of Manganese Lactate Trihydrate

Abstract

A series of manganese carboxylates were prepared by reacting aqueous solutions of glycolic, lactic, oxalic, malonic, malic, tartaric or citric acids with MnO or MnO ₂ at 50–70°C. A single-crystal X-ray structure of racemic manganese(II) lactate trihydrate is presented. Addition of aminoalcohols to the carboxylate complexes increased their solubilities by forming manganese complex anions. Polyesterification of citrate carboxylate groups with the aminoalcohol hydroxyl groups resulted in a hard, homogeneous resin thereby demonstrating the potential for a wet chemical ceramic precursor route. LiMn ₂ O ₄spinel was prepared using a chemical pyrolysis technique from such a manganate precursor resin. Products were characterized with assistance from X-ray powder diffraction (XRD) and elemental analyses.