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Item SOL-GEL THERMOLYSIS SYNTHESIS OF LIMNPO4 FOR SUPERCAPACITOR ELECTRODES(CECRI, Karaikudi, 2016-12-08) N, Priyadharsini; R, Kalai SelvanAs a novel approach, LiMnPO4 has tried as a positive electrode material for the super capacitor system because of its large operating voltage, low cost and environmental friendliness. It is a promising cathode material for Li ion batteries due to its higher redox voltage, 4.1 V vs. Li/Li+, compared to other cathode materials [1-5]. In the present work, LiMnPO4 was synthesized via sol-gel thermolysis using lithium dihydrogen phosphate, manganese acetate were starting materials with citric acid as a fuel. Physical properties, structural and elemental analysis of electrode materials were studied by TEM, X-ray diffraction and EDAX measurements. Surface morphology of the sample shows a thin layer of carbon coating in the as-prepared sample which enhances the electronic conductivity in the charge carrier discharge. The electrochemical performance of the LiMnPO4 electrode materials were studied using cyclic voltammetry, galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy in a three electrode system at a potential range from -0.6 to 0.4 V vs Hg/HgO in 1 M LiOH electrolyte solution. The result exhibits a specific capacitance of 151 F/g at a scan rate of 5 mV s-1. The maximum specific capacitances of 123 F/g for total electrode at 1 A/g were achieved in 1M LiOH solution. These encouraging results promote interest in developing such electrode materials for super capacitor applications, including nontoxic and greener components compared with current organic based devices.Item COMBUSTION SYNTHESIS OF NOVEL CATHODE MATERIAL OF KMNPO4 FOR SUPERCAPACITORS(CSIR –National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 2014-02-19) N, Priyadharsini; R, Kalai SelvanKMnPO4 has prepared as a unique supercapacitor material because of the extensive electrochemical properties of LiMnPO4, which is proved as a one of the best cathode materials1. The compound was synthesized via combustion synthesis using potassium acetate, manganese acetate and ammonium dihydrogen phosphate as precursors with a fuel of citric acid. Structural, surface morphology were studied by XRD, FTIR and TEM analysis and the sample encompass the structure of triclinic having the space group of P (2). The electrochemical properties were observed using cyclic voltammetry, galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy in a three electrode system at a potential range from -0.6 to 0.6 V vs Hg/HgO. The variation in the electrochemical performance of the sample was studied in three different electrolytes such as 1M LiOH, 1M KOH and 1M NaOH. The result shows that KMnPO4 exhibits higher capacitance of 335 F/g at a scan rate of 2mVs-1 for 1M NaOH. This material shows good specific capacity; replace with all the available Li based Manganese pseudocapacitors which are already proved their recital.