Gradient Mn-La-Pt catalysts with three-layered structure for Li-O2 BATTERY

Abstract

Gradient Mn-La-Pt catalysts with three-layered structure of manganese dioxide (MnO2), lanthanum oxide (La2O3), and Platinum (Pt) for Li-O2battery are prepared in this study. The mass ratio of the catalysts is respectively 5:2:3, 4:2:4, and 3:2:5 (MnO2: La2O3: Pt) which is start from the side of the electrolyte. The relationship between morphology structure and electrochemical performance of gradient catalyst is investigated by energy dispersive spectrometry and constant current charge/discharge test. The Li-O2battery based on gradient Mn-La-Pt catalysts shows high discharge specific capacity (2707 mAh g -1), specific energy density (8400 Wh kg -1) and long cycle life (56 cycles). The improvement of the Li-O2battery discharge capacity is attributed to the gradient distribution of MnO2and Pt and the involvement of La2O3that can improve the energy density of the battery. More important, this work will also provide new ideas and methods for the research of other metal-air battery.