| 摘要 |
The present invention relates to a positive electrode catalyst which contains a sea urchin-shaped α-MnO_2 in which platinum (Pt), ruthenium (Ru), iridium (Ir), gold (Au), or palladium (Pd) nanoparticles are dipped, a method for manufacturing the same, and the lithium-air battery using the same. The method for manufacturing the positive electrode catalyst which contains the sea urchin-shaped α-MnO_2 according to the present invention includes: a first step in which sea urchin-shaped α-MnO_2 powder is formed by adding a first reaction activating agent to a manganese (Mn) precursor; a second step in which a mixture is manufactured by adding a second reaction activating agent used to dip one or more types of nanoparticle precursors which is selected form a group consisting of platinum (Pt), ruthenium (Ru), iridium (Ir), gold (Au), and palladium (Pd), and a reducing agent to the α-MnO_2 powder formed in the first step; a third step in which the mixture manufactured in the second step is mixed with the α-MnO_2 powder; and a fourth step in which the mixture manufactured in the third step is reduced. According to the lithium-air battery which adopts the positive electrode catalyst which is manufactured by the manufacturing method of the present invention, an oxygen reaction is accelerated in a positive electrode of the lithium-air battery so that charge and discharge overvoltage can be lowered and energy efficiency can be improved. |
