SYNTHESIS AND CHARACTERIZATION OF NANOSTRUCTURED MnO2 AND LiCoO2 FOR ELECTROCHEMICAL APPLICATION

H.I. Adegoke, F. A. Adekola, A. A. Abdulrahman, A. B. Alabi

Abstract


Manganese oxide (MnO2) and lithiated cobalt oxide nanostructured materials (LiCoO2) were synthesized using hydrothermal and sol-gel methods respectively. The MnO2 was prepared using hydrated manganese sulphate with oxidant and reductant while lithiated cobalt oxide was prepared using hydrated cobalt nitrate, hydrated lithium hydroxide and malonic acid. The nanostructured materials were characterized by spectroscopic techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray fluorescence (XRF), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and BET (Brunauer-Emmett-Teller) to determine crystallinity, phase composition, morphology and surface area. The XRD patterns confirmed the phase composition of the prepared nanostructured MnO2 and LiCoO2 to be tetragonal and layered crystal face respectively. The FTIR absorption peaks of 528 cm-1 (Co-O) and 598 cm-1 (Mn-O) were confirmed. The BET surface area gives 920 and 970 m2/g for MnO2 and LiCoO2 respectively while the SEM shows agglomeration of particles which allow easy intercalation or de-intercalation of ions for faradaic interaction. The electrochemical effectiveness was around 0.19V for both MnO2 and LiCoO2 with a discharge capacity of 4440 and 2959 Cg-1mol respectively. 

Keywords: Nanostructured, manganese oxide, lithiated cobalt oxide, synthesis, spectroscopic techniques.


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Chemical Society of Nigeria