Constructing Ion‐Selective Coating Layer with Lithium Ion Conductor LLZO and Binder Li‐Nafion for Separator Used in Lithium‐Sulfur Batteries

Abstract

In the study of lithium‐sulfur batteries, the shuttle effect of polysulfide ions is widely regarded as the most critical factor in the battery performance deterioration. In this article, with the strategy of ion‐selection, a method of preparing a coating layer with solid‐phase conduction for a separator was used to suppress such an effect. The coating layer was based on calcined ceramic Li7La3Zr2O12 (LLZO) and formed through a simple coating method to be thin but dense. The gap between particles was filled with lithiated Nafion (Li‐Nafion) which could block polysulfide ions through coulombic interactions of sulfonate groups and allowed the lithium ion conduction. The properties of compactness and the ion‐selection formed a double barrier effect, manifested as the fact that the estimated lithium ion transport number achieved 0.79. Correspondingly, the lithium‐sulfur batteries assembled with the ion‐selective conduction separators had better lithium deposition behavior and exhibit brilliant cycling performances and capacity retention.

Simultaneous Inhibition of Zn Dendrites and Polyiodide Ions Shuttle Effect by an Anion Concentrated Electrolyte Membrane for Long Lifespan Aqueous Zinc–Iodine Batteries

“…Cross-sectional SEM images and EDS mapping of the ACE-10 membrane show very compact and uniform morphology without obvious cracks (Figure S8), implying that water in the ACE-10 membrane tends to be bound to polymer chains but does not exist in pores. Simultaneously, the red shift of the sulfonate group in the infrared spectrum (Figure d,1705 cm –1 to 1650 cm –1 ) and the increase of the decomposition temperature of the sulfonate group in the thermogravimetric analysis (Figure S9, 295 to 383 °C) all indicate that Zn 2+ ions were successfully exchanged into the ACE-10 membrane. − Besides, the tensile strength of commercial GF/A and the synthesized ACE-10 membrane are tested by a tensile tester (Figure S10), and the mechanical performance of the ACE-10 membrane far exceeded that of GF/A. σ = F / s …”

All-solid-state lithium–sulfur batteries enabled by single-ion conducting binary nanoparticle electrolytes

“…The utilization of single-ion-conducting polymer binders in Li-S batteries has recently been investigated. [42][43][44] However, successful applications of single-ion polymers as solid-state electrolytes for Li-S batteries remain scarce. Previous studies mainly focused on using single-ion polymers as functional separators 43 or binders 44 for sulfur cathodes.…”

“…[42][43][44] However, successful applications of single-ion polymers as solid-state electrolytes for Li-S batteries remain scarce. Previous studies mainly focused on using single-ion polymers as functional separators 43 or binders 44 for sulfur cathodes. Alternatively, researchers have attempted to prepare membranes by blending single-ion polymers with conventional nonionic polymers, 45 such as poly(vinylidene fluoride-co-hexafluoropropylene).…”

Solid-State Electrolytes for Lithium–Sulfur Batteries: Challenges, Progress, and Strategies

“…Huang et al used Li–Nafion to coat the surface of LLZO with a dense ionic conductive layer to inhibit the shuttle effect. The Coulomb interaction between the conducting layer and the sulfonate group can effectively prevent LiPS shuttle and allows lithium-ion conduction, which improves the cycling performance of Li–sulfur batteries [ 60 ].…”