Effect of PEDOT:PSS coating on manganese oxide nanowires for lithium ion battery anodes

Abstract

Transition metal oxides have been considered as promising lithium storage materials that undergo a conversion reaction, exhibiting high specific capacity. However, capacity fading during cycling is the most serious obstacle for their commercialization. In order to overcome this, we have added PEDOT: PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) to Mn2O3 nanowires. PEDOT: PSS was successfully coated onto Mn2O3 nanowires while maintaining the structure of Mn2O3. The coating of PEDOT: PSS reduced the resistance of the surface and protected the surface electron channels from the pulverization effect of the charge-discharge operation. alpha-Mn2O3/PEDOT: PSS showed excellent cyclability with a reversible capacity of 1450 mAh g (1) after 200 cycles at a current density of 100 mA g (1). An increase in capacity was observed with continuous cycling, which may be attributed to further oxidation of the manganese species and a reversible reaction of the gel-like polymer on the manganese surface. The results demonstrate that PEDOT: PSS enhances the electrochemical activity by providing electron channels and prevents pulverization caused by the charge and discharge process.