▎ 摘　　要

Although lithium-sulfur batteries have the advantages of gravimetric energy density, it remains a challenge to achieve high volumetric energy density in lithium-sulfur batteries due to the employment of conductive porous carbon with low tap density and high porosity. To this context, we synthesized a horizontally aligned lamellar porous graphene/nickel composite (LPG-Ni) as a dense sulfur host material to increase the volumetric capacity of lithium-sulfur batteries while retaining high gravimetric capacity. The nickel decorated on the surface of the porous graphene serves as active sites, effectively adsorbing and catalytically converting polysulfides, thus improving the redox kinetics and reducing shuttle effect. More importantly, the abundant pores on the graphene sheet are considered as a shortcut for lithium-ion diffusion, which accelerates the ion transport through the whole electrode. Owing to the synergistic effect, the as-prepared sulfur cathode exhibits both excellent ionic and electronic conductivity, and has a dense-stacked structure. Thus, the LPG-Ni/S cathode provides high gravimetric and volumetric capacity (718.7 mA h g-(-1)(cathode) and 884.0 mA h cm(cathode)(-3) at 0.1C). Meanwhile, the battery exhibits superior rate capability (369.7 mA h cm(cathode)(-3) at 5C) and cycling performance (1000 cycles, 0.037% decay per cycle at 1C).