H$_$O $_$-Aided One-Pot Hydrothermal Synthesis of Nanocrystalline LiMn$_$O$_$ Cathode for Lithium Batteries


A simple and H2O2-aided hydrothermal (HDT) method has been deployed to synthesize nanocrystalline LiMn2O4 at 140°C using an in-house-made hydrothermal reaction vessel. Phase pure, highly crystalline, and uniformly distributed nanorods of 100 nm length are obtained from the H2O2 aided exothermic oxidation of precursor mix, especially when an excess amount of lithium (Li: Mn as 2:1) is used. The crystalline nature of LiMn2O4 and the growth of nanorods along (111) crystallographic direction are understood from powder x-ray diffraction (PXRD) and selective area electron diffraction (SAED) analysis, respectively. The synthesized cathode exhibited an initial capacity of 118 mAh g-1 with a slightly higher initial capacity fade (9%) and a progressively stabilized (<; 3% capacity fade) specific capacity behavior upon cycling. An equivalent circuit model is proposed to fit with the observed impedance behavior of LiMn2O4 cathode. The exploitation of low temperature assisted one-pot hydrothermal synthesis to prepare nanocrystalline LiMn2O4 compound and the suitability of the same to exhibit better lithium intercalation behavior are demonstrated in this communication.

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