| 摘要 |
PURPOSE: A positive electrode active material for a lithium-sulfur battery and a method for preparing the positive electrode active material composition for a lithium-sulfur battery are provided, to improve the charge voltage and the capacity. CONSTITUTION: The positive electrode active material comprises a sulfur compound; a conductive material adhered to the sulfur compound; and a binder which is placed between the sulfur compound and the conductive material and contains at least one polymer which adheres the conductive material to the sulfur compound. Preferably the sulfur compound is at least one selected from the group consisting of an inorganic sulfur (S8), Li2Sn (n>=1), an organic sulfur compound and a carbon-sulfur polymer ((C2Sx)n, x=2.5-50, n>=2). The method comprises the steps of mixing a sulfur compound, a conductive material and at least one primary binder in a primary organic solvent; drying the mixture to prepare a positive electrode active material; and mixing the positive electrode active material with a secondary binder in a secondary organic solvent. |
