Min Yan

Abstract: Lithium–sulfur (Li–S) batteries are one of the most promising next‐generation battery types for their high energy density and low cost. On the other hand, safety issues and poor cyclability strongly limit practical application. Solid‐state electrolytes (SSEs) can present as high ionic conductivity as aprotic electrolytes and eventually avoid the shuttle effect, which provides an ultimate solution for safe Li–S batteries with good cyclability. In this review, the recent achievements in all‐solid‐state Li–S batteries based on inorganic SSEs are summarized. Furthermore, the main attentions are paid to the interfaces, including metallic lithium|SSEs, SSEs|SSEs, and composite sulfur cathode|SSEs. The potential approaches to deal with these interfacial issues are proposed as well, such as composite SSEs with an asymmetric structure to enhance their compatibility with lithium anodes and sulfur cathodes, adding Li2O or LiF and increasing the densification to reduce the grain boundary resistance, and nanomaterials used to improve the kinetic process in cathode.

TL;DR: In this paper, a review of the interfacial issues in Li-S batteries with traditional liquid electrolytes and the latest research trend including gel polymer electrolytes, solid polymer electrolyte, solid inorganic electrolyte and hybrid electrolytes is presented.

TL;DR: The amorphous CEI integrates the bifunctionality to provide an excellent cycling stability, high Coulombic efficiency and favourable rate capability in high-voltage Li-metal batteries, innovating the design philosophy of functional CEI strategy for future high-energy-density batteries.

TL;DR: In this paper, a dual-interface amorphous cathode electrolyte interphase/solid electrolyte Interphase CEI/SEI protection (DACP) strategy is proposed to conquer the main challenges of electrochemical side reactions and Li dendrites in hybrid solid-liquid batteries without sacrificing energy density via LiDFOB and LiBF4 in situ synergistic conversion.