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Cubic spinel lithium manganese oxide (LiMn2O4) has been able to attract agreat deal of attention over the years as a promising cathode material forlarge scale lithium ion batteries. Here a facile hydrothermal route followed bysolid state reaction is developed using as grown ultrafine alpha-MnO2 nanorodsto prepare one dimensional LiMn2O4 with 10-50nm diameters. To enhance thecathodic property of these nanorods, a unique synthesis technique of heattreatment is developed to grow 2D graphene oxide sheet enveloping 1D LiMn2O4 asinterconnected framework. This nanocomposite 3D porous cathode exhibits a highspecific charge capacity of 130mAh/g at 0.05C rate and Coulombic efficiency ofabout 98% after 100 cycles in the potential window of 3.5 to 4.3V versus Li/Li+with promising initial charge capacity retention of about 87%, and outstandingstructural stability even after 100 cycles. Enhancement in the lithiation anddelithiation processes leading to improved performance is likely to have itsorigin in the 2D conducting graphene oxide sheets. It allows for decreasing theMn dissolution, improve the electron conductivity and reduce the Li-ion pathdiffusion inside the favourable morphology and crystallinity of the ultrafine1D LiMn2O4 nanorods, giving rise to a promising cathode nanocomposite.

applied surface science

Facile synthesis of 2D graphene oxide sheet enveloping ultrafine 1D  LiMn2O4 as interconnected framework to enhance cathodic property for Li-ion  battery