A bi-functional Li-O2 battery cathode composed of perovskite oxide La0.8Sr0.22Co0.8Fe0.2O3 (LSCF8282) and N-doped reduced graphene oxide (N-rGO) was prepared by a sol-gel method and hydrothermal treatment. LSCF nanoparticles were dispersed homogeneously on the surface of N-rGO and the composite cathode was investigated for Li-O2 batteries. The results confirmed that Li-O2 batteries with the LSCF@N-rGO cathode exhibited better cycle stability than both LSCF-SP (Super P) and pure N-rGO cathodes. Furthermore batteries with the LSCF@N-rGO cathode showed higher capacity coulombic efficiency and lower overpotential compared with those with the pure N-rGO cathode. EIS study and morphology evolution of products revealed that LSCF can remold the shape of Li2O2 and catalyze the decomposition of i2O2 which is crucial for oxygen reduction reaction and oxygen evolution reaction processes.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry