Oxygen-incorporated crystalline/amorphous heterophase cobalt vanadium selenide nanoplates with dense interfacial sites for robust lithium–sulfur batteries

Tan, Pengcheng; Yin, Yuan; Cai, Daoping; Fei, Ban; Zhang, Chaoqi; Chen, Qidi; Zhan, Hongbing

doi:10.1039/d3ta07189h

Cited by 6 publications

(1 citation statement)

References 67 publications

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“…The doping of nitrogen atoms brings abundant active sites and improves the carbon conductivity to realize more practical lithium-sulfur batteries with excellent performance at low temperatures. [42] In 2016, Shaoyin et al [43] used nitrogen-enriched carbon and carbon/sulfur composite as raw materials to prepare the proper carbonization with the good low-temperature electrochemical performance. The electrochemical evaluation of the nitrogenenriched carbon/sulfur composite cathode indicated that a reversible capacity of 368 mAh g À 1 (0.5 C) over 100 cycles was achieved at À 20 °C.…”

Section: Improved Cathodementioning

confidence: 99%

Design of Wide‐Temperature Lithium‐Sulfur Batteries

Yang,

Zhao,

et al. 2024

Batteries & Supercaps

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In electrochemical energy storage (EES), lithium‐sulfur (Li‐S) batteries have recently gained recognition for their exceptional theoretical specific capacity, making them stand out among a wide range of cutting‐edge energy storage technologies. While Li‐S batteries demonstrate a long cycle life under regular conditions, expanding their application scenarios is crucial for their future development. Specifically, ensuring stable battery operation in extreme temperature environments, such as below 0°C and above 60°C, becomes paramount. Thus, this review aims to summarize the recent progress of Li‐S batteries in extreme temperature ranges and analyze the processability of critical materials within these batteries at extreme temperatures. Ultimately, this review presents insights and potential prospects for Li‐S battery systems operating within a wide temperature range, contributing to advancing energy storage devices capable of functioning across various temperatures.

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Section: Improved Cathodementioning

confidence: 99%

Design of Wide‐Temperature Lithium‐Sulfur Batteries

Yang,

Zhao,

et al. 2024

Batteries & Supercaps

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Pristine MOF Materials for Separator Application in Lithium–Sulfur Battery

Cheng,

Lian,

Zhang

et al. 2024

Advanced Science

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Lithium–sulfur (Li–S) batteries have attracted significant attention in the realm of electronic energy storage and conversion owing to their remarkable theoretical energy density and cost‐effectiveness. However, Li–S batteries continue to face significant challenges, primarily the severe polysulfides shuttle effect and sluggish sulfur redox kinetics, which are inherent obstacles to their practical application. Metal‐organic frameworks (MOFs), known for their porous structure, high adsorption capacity, structural flexibility, and easy synthesis, have emerged as ideal materials for separator modification. Efficient polysulfides interception/conversion ability and rapid lithium‐ion conduction enabled by MOFs modified layers are demonstrated in Li–S batteries. In this perspective, the objective is to present an overview of recent advancements in utilizing pristine MOF materials as modification layers for separators in Li–S batteries. The mechanisms behind the enhanced electrochemical performance resulting from each design strategy are explained. The viewpoints and crucial challenges requiring resolution are also concluded for pristine MOFs separator in Li–S batteries. Moreover, some promising materials and concepts based on MOFs are proposed to enhance electrochemical performance and investigate polysulfides adsorption/conversion mechanisms. These efforts are expected to contribute to the future advancement of MOFs in advanced Li–S batteries.

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Direct Observation of Hybridization Between Co 3d and S 2p Electronic Orbits: Moderating Sulfur Covalency to Pre‐Activate Sulfur‐Redox in Lithium–Sulfur Batteries

Wang,

Jia,

Jin

et al. 2024

Advanced Science

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Lithium–sulfur batteries (LSBs) offer high energy density and environmental benefits hampered by the shuttle effect related to sluggish redox reactions of long‐chain lithium polysulfides (LiPSs). However, the fashion modification of the d‐band center in separators is still ineffective, wherein the mechanism understanding always relies on theoretical calculations. This study visibly probed the evolution of the Co 3d‐band center during charge and discharge using advanced inverse photoemission spectroscopy/ultraviolet photoemission spectroscopy (IPES/UPS), which offers reliable evidence and are consistent well with theoretical calculations. This, coupled with in situ Raman and X‐ray diffraction (XRD) and electrochemical data, co‐evidences a novel pre‐activating S redox mechanism in LSBs: LiPSs desert/insert in C‐N matrixes within a series of Co@NCNT‐based separators. The insight of the S redox pre‐activation is discovered that the Co 3d‐band center downshifts to hybridized with S 2p orbitals in LiPSs, giving rise to a more pronounced S covalency and thus accelerating the conversion of LiPSs to S₈. Benefiting from these advantages, the optimized LSB possesses a minimal decay rate of 0.0058% after 200 cycles at a high discharge rate of 10 C. This study provides new insights into LSB mechanisms and supports conventional theoretical models of the d‐band center's impact on LSB performance.

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Oxygen-incorporated crystalline/amorphous heterophase cobalt vanadium selenide nanoplates with dense interfacial sites for robust lithium–sulfur batteries

Abstract: The practical applications of lithium-sulfur (Li-S) batteries are severely impeded by the shuttle effect of soluble lithium polysulfides (LiPSs), sluggish redox reaction kinetics, and insulating nature of sulfur and its...

Cited by 6 publications

References 67 publications

Design of Wide‐Temperature Lithium‐Sulfur Batteries

Design of Wide‐Temperature Lithium‐Sulfur Batteries

Pristine MOF Materials for Separator Application in Lithium–Sulfur Battery

Direct Observation of Hybridization Between Co 3d and S 2p Electronic Orbits: Moderating Sulfur Covalency to Pre‐Activate Sulfur‐Redox in Lithium–Sulfur Batteries

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