Cluster-type lithium polysulfides regulator for high performance lithium-sulfur batteries

Wang, Zhihua; You, Yingying; Cai, Yingying; Ni, Junze; Liu, Yilin; Zhang, Hanping

doi:10.1016/j.electacta.2022.141539

“…Wang et al. [ 118 ] proposed to dissolve the cluster additive bipyridyl disulfide (DpyDS) in the electrolyte as an additive for Li–S battery, followed by in situ lithiation reaction to generate lithium pyridine‐2‐thiolate (LiPyS). The formed complex can suppress the “shuttle effect” of LiPSs through double Li⋅⋅⋅S bonds.…”

Section: Electrolytes Design Based On “Solid–liquid–solid” Conversionmentioning

confidence: 99%

“…The TTF additive also greatly suppresses the side reaction of the Li anode with LiPSs, thereby reducing the consumption of the electrolyte during cycling (Figure 9c). Wang et al [118] proposed to dissolve the cluster additive bipyridyl disulfide (DpyDS) in the electrolyte as an additive for Li-S battery, followed by in situ lithiation reaction to generate lithium pyridine-2-thiolate (LiPyS). The formed complex can suppress the "shuttle effect" of LiPSs through double Li⋅⋅⋅S bonds.…”

Section: Additives For Modulating Molecular Orbital Energy Level Of L...mentioning

confidence: 99%

Perspectives of High‐Performance Li–S Battery Electrolytes

Liu,

Zhou,

Yan

et al. 2023

Adv Funct Materials

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Lithium–sulfur batteries with high energy density are considered to be one of the most promising candidates for the next‐generation energy storage devices. Electrolyte as the medium for Li+ transportation between the electrodes, also plays a crucial role in inhibiting the dissolution and diffusion of lithium polysulfides in Li–S batteries. The working mechanism of Li–S batteries in different electrolytes is classified into “solid‐liquid‐solid” and “solid‐solid” conversions. Under the “solid‐liquid‐solid” conversion, Li–S batteries would inevitably face the challenges such as “shuttle effect” that lead to poor cycle performance, and under the “solid‐solid” conversion, they would face interface mismatch that limits the utilization of sulfur with low energy density, while both conversion mechanisms cause uncontrollable Li dendrites on anode. According to the conversion mechanism, electrolytes can be divided into ether‐based, ionic liquid‐based, gel polymer electrolytes, and polymer‐based solid‐state electrolytes with “solid‐liquid‐solid” conversion, as well as carbonate‐based electrolytes and oxide/sulfide‐based solid‐state electrolytes with “solid‐solid” conversion. Based on the conversion mechanism of active materials in different electrolytes, the current status on the strategies from multiple perspectives are summarized to improve the electrochemical performance, with the hope to provide a comprehensive guideline toward the development of suitable electrolytes for Li–S batteries.

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Fence‐Type Molecular Electrocatalysts for High‐Performance Lithium‐Sulfur Batteries

Wang,

Zhu,

Jiang

et al. 2024

Angewandte Chemie

1

0

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Improving the slow redox kinetics of sulfur species and shuttling issues of soluble intermediates induced from the multiphase sulfur redox reactions are crucial factors for developing the next‐generation high‐energy‐density lithium‐sulfur (Li‐S) batteries. In this study, we successfully constructed a novel molecular electrocatalyst through in situ polymerization of bis(3,4‐dibromobenzene)‐18‐crown‐6 (BD18C6) with polysulfide anions on the cathode interface. The crown ether (CE)‐based polymer acts as a spatial "fence" to precisely control the unique redox characteristics of sulfur species, which could confine sulfur substance within its interior and interact with lithium polysulfides (LiPSs) to optimize the reaction barrier of sulfur species. The "fence" structure and the double‐sided Li+ penetrability of the CE molecule may also prevent the CE catalytic sites from being covered by sulfur during cycling. This new fence‐type electrocatalyst mitigates the “shuttle effect”, enhances the redox activity of sulfur species, and promotes the formation of three‐dimensional stacked lithium sulfide (Li2S) simultaneously. It thus enables lithium‐sulfur batteries to exhibit superior rate performance and cycle stability, which may also inspire development facing analogous multiphase electrochemical energy‐efficient conversion process.

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Fence‐Type Molecular Electrocatalysts for High‐Performance Lithium‐Sulfur Batteries

Wang,

Zhu,

Jiang

et al. 2024

Angew Chem Int Ed

1

0

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Improving the slow redox kinetics of sulfur species and shuttling issues of soluble intermediates induced from the multiphase sulfur redox reactions are crucial factors for developing the next‐generation high‐energy‐density lithium‐sulfur (Li‐S) batteries. In this study, we successfully constructed a novel molecular electrocatalyst through in situ polymerization of bis(3,4‐dibromobenzene)‐18‐crown‐6 (BD18C6) with polysulfide anions on the cathode interface. The crown ether (CE)‐based polymer acts as a spatial "fence" to precisely control the unique redox characteristics of sulfur species, which could confine sulfur substance within its interior and interact with lithium polysulfides (LiPSs) to optimize the reaction barrier of sulfur species. The "fence" structure and the double‐sided Li+ penetrability of the CE molecule may also prevent the CE catalytic sites from being covered by sulfur during cycling. This new fence‐type electrocatalyst mitigates the “shuttle effect”, enhances the redox activity of sulfur species, and promotes the formation of three‐dimensional stacked lithium sulfide (Li2S) simultaneously. It thus enables lithium‐sulfur batteries to exhibit superior rate performance and cycle stability, which may also inspire development facing analogous multiphase electrochemical energy‐efficient conversion process.

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Cluster-type lithium polysulfides regulator for high performance lithium-sulfur batteries

Cited by 5 publications

References 42 publications

Perspectives of High‐Performance Li–S Battery Electrolytes

Perspectives of High‐Performance Li–S Battery Electrolytes

Fence‐Type Molecular Electrocatalysts for High‐Performance Lithium‐Sulfur Batteries

Fence‐Type Molecular Electrocatalysts for High‐Performance Lithium‐Sulfur Batteries

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