Electrochemical Properties of Carbon-Coated FeS2 as a Positive Electrode for Lithium Secondary Batteries

Chang Su Kim; Soon Ki Jeong

doi:10.4028/www.scientific.net/KEM.733.27

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Utilization Low Rank Coal Bottom Ash as TiO₂ Support for Oxidation Catalyst of Styrene with Hydrogen Peroxide Aqueous
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Comparison of Layer-Forming and Bromine-Doping Methods of Pentacene Layer in Solid-State Dye-Sensitized Solar Cell
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Recovery of Nickel from Waste Lithium Ion Secondary Battery and Fabrication of Nickel Nanopowder
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Electrochemical Properties of Carbon-Coated FeS₂ as a Positive Electrode for Lithium Secondary Batteries
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Beneficial Effects of Nano Hydrophobic Coatings for Solar Photovoltaic Modules in Dusty Environment
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An Experimental Analysis of Lactic Acid Esterification Process Using Langmuir-Hinshelwood Model
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Separation of Methane from Shuttle Tanker Vents Gases by Adsorption on a Polyurethane/Zeolite Membrane
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Neutronic Analysis of Thorium Nitride (Th, U233)N Fuel for 500MWth Gas Cooled Fast Reactor (GFR) Long Life without Refueling
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Electrochemical Properties of Carbon-Coated FeS₂ as a Positive Electrode for Lithium Secondary Batteries

Abstract:

The electrochemical properties of carbon-coated FeS₂ were investigated as a positive electrode material for lithium secondary batteries. The carbon-coated FeS₂ powders were synthesized by ball-milling using polyaniline as the carbon source. The particles in the carbon-coated FeS₂ samples were smaller than those in the pristine FeS₂ samples. The electrochemical performance, including capacity, of these batteries was improved by carbon-coating by ball-milling. However, the initial coulombic efficiency decreased because of the reduction of the oxidized products on FeS₂ surface. The reduction in particle size provides a larger contact area for the electrolyte. Larger quantities of oxidation products were formed by the reduction of FeS₂ in the presence of air and water after carbon-coating. Therefore, the poor initial coulombic efficiencies of carbon-coated FeS₂ electrodes were caused by the reduction of the oxidized products on the FeS₂ surface.