Performances of lithium manganese oxide prepared by hydrothermal process

Abstract

A simple hydrothermal process followed by heat treatment was applied to the preparation of spinel Li_1.05Mn_1.95O₄. In this process, electrolytic manganese dioxide (EMD) and LiOH·H₂O were used as starting materials. The physiochemical properties of the synthesized samples were investigated by thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffractometry (XRD), and scanning electronic microscopy (SEM). The results show that the hydrothermally synthesized precursor is an essential amorphous. The precursor can be easily transferred to spinel powders with a homogeneous structure and a regularly-shaped morphology by heat treatment. Li_1.05Mn_1.95O₄ powder obtained by heat treating the precursor at 430 °C for 12 h and then calcining at 800 °C for 12 h shows an excellent cycling performance with an initial charge capacity of 118.2 mA·h·g⁻¹ obtained at 0.5C rate and 93.8% of its original value retained after 100 cycles.

Keywords

lithium ion batteries / LiMn₂O₄ / hydrothermal method / heat treatment

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