METAL OXIDE-BASED NANOMATERIALS FOR LITHIUM-OXYGEN BATTERIES APPLICATION

ZHANG JIAN

Publication

METAL OXIDE-BASED NANOMATERIALS FOR LITHIUM-OXYGEN BATTERIES APPLICATION

ZHANG JIAN

Abstract

RECHARGEABLE LI?O2 BATTERIES WITH REMARKABLY HIGH THEORETICAL ENERGY DENSITY HAVE ATTRACTED EXTENSIVE ATTENTION. HOWEVER, TO ENABLE LI?O2 BATTERIES FOR PRACTICAL APPLICATIONS, NUMEROUS CHALLENGES NEED TO BE OVERCOME, E.G. HIGH OVERPOTENTIAL, LOW RATE CAPABILITY, AND POOR CYCLING STABILITY. THE KEY FACTOR TO TACKLE THESE ISSUES IS TO DEVELOP HIGHLY-EFFICIENT CATHODE CATALYSTS. MOREOVER, THE CATHODE CATALYSTS WITH POROUS STRUCTURE AND LARGE SURFACE AREA ARE FAVORABLE IN LI-O2 BATTERIES, WHICH CAN FACILITATE THE DIFFUSION OF OXYGEN AND ELECTROLYTE, AS WELL AS PROVIDING SUFFICIENT CATALYTIC ACTIVE SITES FOR ORR/OER. IN THIS STUDY, POROUS PEROVSKITE LANIO3 NANOCUBES, SPINEL-TYPE POROUS CO?MN?O NANOCUBES, HIERARCHICAL POROUS D-MNO2 NANOBOXES AND POROUS CO3O4 NANOBOXES HAVE BEEN DEVELOPED AND EMPLOYED AS THE CATHODE CATALYSTS FOR LI-O2 BATTERIES. THE SYNERGISTIC EFFECTS OF LARGE SPECIFIC SURFACE AREA, POROUS OR HOLLOW STRUCTURE, AND HIGH ELECTROCATALYTIC ACTIVITY OF THESE CATALYSTS ENDOW THE