Solution‐Based Chemical Process for Synthesis of Highly Active Li2S/Carbon Nanocomposite for Lithium‐Sulfur Batteries

Abstract A novel method for the preparation of Li2S integrated into porous carbon black as host material by using a facile solution‐based chemical process is described. Li2S was synthesized by disproportionation of a Li2S6 polysulfide solution. The combination of a homogeneous Li2S distribution with small Li2S particle size and good contact with the carbon surface leads to ideal properties for the application in high‐energy‐density long‐cycle‐life lithium‐sulfur batteries. An initial discharge capacity of 1259 mA h g−1sulfur with good cycle stability as well as low polarization are achieved, rendering the novel method particularly suitable for application in full cells with silicon‐ or carbon‐based anodes, which are used to overcome the main limitations observed using metallic lithium as anode in lithium‐sulfur batteries.