▎ 摘 要
For lithium-sulfur (Li-S) batteries to be practically applicable in large scale, high mass loading and high S content are required for the sulfur (S) cathodes. Most reported S cathode preparation procedures, such as melt infiltration of S into carbon scaffolds followed by conventional solvent-based slurry casting, are time-consuming, costly, and lack control with respect to the electrode composition and quality. Here we report the use of a facile room-temperature procedure that is especially useful in the preparation of high density, high mass loading S cathodes with convenient control of S content and electrode architecture. The solvent-free and binder-free procedure is enabled by the use of holey graphene (hG) as a unique dry-pressable electrode scaffold host to effectively encapsulate S in the conductive matrix. The entire process can be completed within just a few minutes at room temperature, in comparison to much longer time required for most other methods. With effective S utilization, the high mass loadings and high densities of the dry-pressed hG-hosted S cathodes result in excellent areal (up to 20 mAh/cm(2)) and volumetric performance (1787 mAh/cm(3) is the highest reported to date), respectively. The hG-enabled dry-press method therefore offers an attractive processing option for S composite cathode fabrication toward practical applications.