▎ 摘　　要

Rechargeable lithium-sulfur (Li-S) batteries are a promising energy storage device because of their high energy density, but the poor electrical conductivity of the sulfur cathode and the polysulfide-shuttle effect still hinder the application of Li-S batteries. Herein, with the aid of compositional and structural design and the use of a controllable one-pot hydrothermal method, a three-dimensional (3D) porous reduced graphene oxide@La2O3@S (r-GO@La2O3@S) composite is fabricated for use as the cathode material of Li-S batteries. In this 3D porous structure, the effective adsorption ability of the La2O3 microboards toward the polysulfides, based on strong chemical binding, and the conductivity of r-GO provide pathways to facilitate electron and ion transport while being able to accommodate the volume expansion/contraction of the sulfur cathode during the discharge-recharge processes. The r-GO@La2O3@S cathode delivers an initial reversible capacity of 1227.4 mAh g(-1) and remains 668.3 mAh g -1 at 0.2 C after 200 cycles. At a higher current of 1 C, the capacity retention remains higher than 73% of the initial capacity after 100 cycles, indicating the excellent electrochemical properties of the cathode. The exceptional performance is attributed to the synergistic effects of the conductive r-GO and La2O3 microboards with the active sulfur.