Morphological reduction of Fe3O4 by single step hydrothermal synthesis using 1D MnO2 as a template and its supercapacitive behaviour

Nanomaterials have attracted wide attention due to its promising characteristics in contrast to its bulk counterpart. However, its synthesis techniques need to be explored further for its employability in the...

Synthesis and Surface Coating of LiMn₂O₄ Nanorods for the Cathode of the Lithium-Ion Battery

MnO₂ nanorods are prepared using a hydrothermal method, and used as precursors for the synthesis of LiMn₂O₄ nanorod-based active material for the cathode of lithium-ion batteries. The effects of additives, pressure, reactant concentration in the solution, and reaction time during the hydrothermal synthesis on the morphology of MnO₂ are examined. For the synthesis of the LiMn₂O₄ nanorods, two synthetic methods, hydrothermal processing of the MnO₂ precursor in a Li-containing solution, and the solid-state reaction of the precursor with LiOH·H₂O powder are tested. The morphological and electrochemical properties of the resulting materials are then analyzed. The rate and cycle performances of the LiMn₂O₄ nanorods are considerably improved by a composite coating of Li-ion-conductive Li₂O-2B₂O₃ and electrically conductive carbon. Because the conductive properties of these coating materials can be obtained with low crystallinity of them, superior coating performance is attainable with relatively low-temperature of after heating, which is advantageous in preserving the morphology of LiMn₂O₄ nanorods.

La3+:Ni–Cl oxyhydroxide gels with enhanced electroactivity as positive materials for hybrid supercapacitors

Novel poorly crystalline La³⁺:Ni–Cl oxyhydroxide gels with sufficient electroactive sites and atomically homogeneous distribution of Ni²⁺, La³⁺, and Cl⁻ ions were synthesized.