Lithium/Sulfide All‐Solid‐State Batteries using Sulfide Electrolytes

Abstract

All‐solid‐state lithium batteries (ASSLBs) are considered as the next generation electrochemical energy storage devices because of their high safety and energy density, simple packaging, and wide operable temperature range. The critical component in ASSLBs is the solid‐state electrolyte. Among all solid‐state electrolytes, the sulfide electrolytes have the highest ionic conductivity and favorable interface compatibility with sulfur‐based cathodes. The ionic conductivity of sulfide electrolytes is comparable with or even higher than that of the commercial organic liquid electrolytes. However, several critical challenges for sulfide electrolytes still remain to be solved, including their narrow electrochemical stability window, the unstable interface between the electrolyte and the electrodes, as well as lithium dendrite formation in the electrolytes. Herein, the emerging sulfide electrolytes and preparation methods are reviewed. In particular, the required properties of the sulfide electrolytes, such as the electrochemical stabilities of the electrolytes and the compatible electrode/electrolyte interfaces are highlighted. The opportunities for sulfide‐based ASSLBs are also discussed.

Sn-O dual-doped Li-argyrodite electrolytes with enhanced electrochemical performance

“…For example, LiI incorporation in sulfides improves critical current density and compatibility of the electroltye toward Li metal [17,18]. It has also been reported that O doping enhances the interfacial stability of sulfide electrolyte toward oxide cathode material and Li metal [19][20][21][22], because O doping may suppress the side reaction between cathode and electrolyte by optimizing the space-charge layer, lowering the interfacial resistance, and mitigating the degradation of sulfide [23][24][25][26][27]. Additionally, by replacing the weak PÀS bonds with the stable PÀO bonds, O doping obviously improves the moisture stability of sulfides [28][29][30] On the other hand, Sn with good lithiophilicity is favorable for uniform Li nucleation and even lithium plating and stripping [31].…”

All-Solid-State Lithium-Ion Batteries with Oxide/Sulfide Composite Electrolytes

“…However, the semicircle (bulk and grain-boundary resistances) of the composite electrolyte samples decreased significantly as the LPSC ratio increased, suggesting that the relative density of the composite electrolyte was enhanced by the addition of LPSC particles. LPSC is softer than LLZO and exhibits plastic deformation, which makes it easy to fabricate a densely packed composite electrolyte by cold pressing [24,25].…”

Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

“…[1][2][3] However, battery failure generally occurs due to parasitic reactions and anode pulverization, wherein liquid electrolytes (LEs) continuously react with Li metal. [4,5] The uncontrolled Li dendrites formed during electrochemical Li plating/stripping in LEs can also lead to battery short-circuit, impeding the practical application of Li metal anode in lithium batteries. [6,7,34] To address these issues, solid-state electrolytes are considered as particularly ideal replacements for the flammable LEs because of their inherent safety characteristics and potential to prevent dendritic deposition and structural damage of Li anode.…”