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

• Published in: Applied surface science Vol. 463; pp. 132 - 140
• Main Authors: Kumar, Niraj, Rodriguez, Jassiel R., Pol, Vilas G., Sen, Arijit
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2019
• Subjects: Cathode; Graphene oxide; Hydrothermal; Li-ion battery; Nanorods; Ultrafine; Graphene oxide; Cathode; Hydrothermal; Li-ion battery; Nanorods; Ultrafine
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.08.210

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•1D α-MnO2 was effectively utilized to grow ultrafine 1D LiMn2O4.•LiMn2O4/Graphene Oxide nanocomposite was prepared at 750 °C.•2D Graphene Oxide framework enhances the cathodic property of 1D LiMn2O4.
Cubic spinel lithium manganese oxide (LiMn2O4) has been able to attract a great deal of attention over the years as a promising cathode material for large-scale lithium-ion batteries. Here a facile hydrothermal route followed by solid state reaction is developed using as grown ultrafine α-MnO2 nanorods to prepare 1D LiMn2O4 with 10–50 nm diameters. To enhance the cathodic property of these nanorods, a unique synthesis technique of heat treatment is developed to grow 2D graphene oxide sheet enveloping 1D LiMn2O4 as interconnected framework. This nanocomposite 3D porous cathode exhibits a high specific charge capacity of 130 mAh g−1 at 0.05 C rate and Coulombic efficiency of ∼98% after 100 cycles in the potential window of 3.5 to 4.3 V vs Li/Li+ with promising initial charge capacity retention of ∼87%, and outstanding structural stability even after 100 cycles. Enhancement in the lithiation and de-lithiation processes leading to improved performance is likely to have its origin in the 2D conducting graphene oxide sheets. It allows for decreasing the Mn dissolution, improve the electron conductivity and reduce the Li-ion path diffusion inside the favourable morphology and crystallinity of the ultrafine 1D LiMn2O4 nanorods, giving rise to a promising cathode nanocomposite.