Electrolytic manganese dioxide from low grade manganese residue precursor - Effect of sodium lauryl sulphate
Biswal, A., Tripathy, B.C. and Subbaiah, T. (2013) Electrolytic manganese dioxide from low grade manganese residue precursor - Effect of sodium lauryl sulphate. In: XIII International Seminar on Mineral Processing Technology (MPT-2013), 10 - 12 December, Bhubaneswar,Odisha, India
The effect of insitu addition of sodium lauryl sulphate (SLS) on the microstructure and the electrochemical properties of the electrolytic manganese dioxide (EMD) produced from low grade manganese residue has been discussed in the present study. X-ray diffraction (XRD), Thermogravimetry-differential thermal analysis (TG-DTA) and chemical analyses were used to determine the structural and chemical characteristics of the EMD samples. The charge–discharge profile was studied using a galvanostatic charge-discharge unit. All the samples were found to contain predominantly γ-phase MnO2, which is electrochemically active for energy storage applications. FESEM images showed that spindle-shaped nano-particles with porous surface and platy nano particles were obtained in the case of EMD with and without additive respectively. It was observed that addition of the surfactant at its optimum concentration greatly improved the cycle life of EMD cathode. EMD obtained in the presence of 50 ppm SLS showed superior cycle life by retaining about 46% (100 mAhg-1) of its initial discharge capacity after 20th cycle. However EMD in the absence of SLS and the EMD with 10 ppm of SLS retained about 7.5% (20 mAhg-1) and 16 % (32 mAhg-1) of its initial discharge capacity respectively after 20th cycle. Thermal studies showed loss of structural water and formation of lower manganese oxides indicating higher stability of the EMD samples.
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