The lithium-oxygen battery has captured worldwide attention recently because of its energy levels approaching that of gasoline have been postulated. This intense investigation, however, has soon highlighted a series of issues that prevent a rapid development of the lithium-oxygen electrochemical system,such as large overpotential,poor cycling ability,low energy efficiency. Many factor limiting the performances of non-aqueous lithium-oxygen batteries, including the corrosion of the lithium metal, decomposition of the electrolyte,the structure of cathode material and the catalytic activity of catalysts for ORR/OER. This review covers the most recent and significant scientific progress made in the fields relevant to non-aqueous lithium-oxygen batteries, with emphasis on the cathode electrode. After a brief introduction to the different of catalysts and cathode microstructure design, a discussion of the effect of catalysts and cathode design on the performance of lithium-oxygen batteries is presented sequentially, and the final conclusion remarks on future challenges and perspectives.

Contents
1 Introduction
2 Lithium-oxygen batteries overview
2.1 The classification of lithium-oxygen batteries
2.2 The reaction mechanism of lithium-oxygen battery
2.3 Challenges facing the lithium-oxygen battery
3 Cathode materials for non-aqueous lithium-oxygen battery
3.1 Bifunctional catalyst/carbon composite material
3.2 Carbon-free composite materials
3.3 Cathode materials of microstructure design
4 Conclusion and outlook