Simultaneous Suppression of the Dendrite Formation and Shuttle Effect in a Lithium–Sulfur Battery by Bilateral Solid Electrolyte Interface

Abstract

Although the reversible and inexpensive energy storage characteristics of the lithium–sulfur (Li‐S) battery have made it a promising candidate for electrical energy storage, the dendrite growth (anode) and shuttle effect (cathode) hinder its practical application. Here, it is shown that new electrolytes for Li‐S batteries promote the simultaneous formation of bilateral solid electrolyte interfaces on the sulfur‐host cathode and lithium anode, thus effectively suppressing the shuttle effect and dendrite growth. These high‐capacity Li‐S batteries with new electrolytes exhibit a long‐term cycling stability, ultrafast‐charge/slow‐discharge rates, super‐low self‐discharge performance, and a capacity retention of 94.9% even after a 130 d long storage. Importantly, the long cycle stability of these industrial grade high‐capacity Li‐S pouch cells with new electrolytes will provide the basis for creating robust energy dense Li‐S batteries with an extensive life cycle.

Single Atom Array Mimic on Ultrathin MOF Nanosheets Boosts the Safety and Life of Lithium–Sulfur Batteries

“…So far, most of the study has focused on either suppressing polysulfide diffusion or preventing growth of Li dendrites. There are a few reports demonstrating simultaneous enhancements on both sulfur cathode and Li metal anode in a same Li–S cell . As an indispensable component in a battery system, the routine separator can avoid the internal short circuit of cathode and anode while providing channels for ion transport.…”

Recent progress in fluorinated electrolytes for improving the performance of Li–S batteries

“…Although a single SEI on either the sulfur cathode or lithium anode has been reported to be vital for the cycle life of Li-S batteries, it is still not sufficient to restrain dendrite growth and the shuttle effect simultaneously. Lu et al developed three types of ether-carbonate mixed electrolyte for Li-S/PAN batteries by adjusting the volume ratio of various solvents and lithium salts [128] . Interestingly, the Li diffusion coefficient of mixed electrolytes was remarkably higher than that of traditional electrolyte.…”

Effect of Crystal Structures on Electrochemical Performance of Hierarchically Porous CoSe2 Spheres as Anodes for Sodium‐Ion Batteries

“…Nevertheless, as similar as other MXs, the application of the CoSe 2 is impeded by its poor ion‐diffusion efficiency and large volume expansion during electrochemical reaction process. To address the above issues, the frequently‐used strategies are concentrated on constructing nanostructured materials and incorporating conductive materials, which not only provide large specific surface area and shorten Na + diffusion length, but improve electrical conductivity and alleviate large volume expansions during discharge‐charge process . At present, many nanostructured CoSe 2 materials including urchin‐like, nanorods, hollow polyhedrons, microboxes, and Cobblestone‐Like have been reported and they have exhibited good electrochemical performance as anode materials for the SIBs.…”

“…To address the above issues, the frequently-used strategies are concentrated on constructing nanostructured materials and incorporating conductive materials, which not only provide large specific surface area and shorten Na + diffusion length, but improve electrical conductivity and alleviate large volume expansions during dischargecharge process. [23][24][25][26][27] At present, many nanostructured CoSe 2 materials including urchin-like, [28] nanorods, [29] hollow polyhedrons, [30] microboxes, [31] and Cobblestone-Like [32] have been reported and they have exhibited good electrochemical performance as anode materials for the SIBs. Zhang et al prepared urchin-like CoSe 2 assembled by nanorod as an anode for SIBs via simple solvothermal method and it exhibited a large specific capacity of 410 mAh g À 1 and ultralong cycle-life of 1800 cycles at 1 A g À 1 .…”