▎ 摘　　要

Ru/graphene/carbon nanotube composites with three-dimensional network structure were prepared by physical impregnation and freeze drying. When the Ru content was 30%(mass fraction) and the heat treatment temperature was 500 degrees C, the catalytic performance of the composite was optimal. When the composite was used as a cathode catalyst for lithium oxygen batteries, it exhibited excellent battery performance. When the first charge and discharge were performed at a current density of 50 mA/g, the discharge capacity density was about 5800 mA.h/g, and when the discharge capacity density was within 4000 mA.h/g, the polarization voltage was only was 0.9 V; when a constant-capacitance(500 mA.h/g) charge-discharge cycle was performed at a current density of 50 mA/g, the battery was stable for 12 cycles even when the polarization voltage was lower than 1.1 V. The three-dimensional network structure not only provided a transmission channel for O-2 and Li+, but also increased the storage location of the discharge product Li2O2. The loading of the metal ruthenium nanoparticles not only increased the reactive site of the composite, but also promoted the decomposition of the discharge product Li2O2.