Enhanced chemical trapping and catalytic conversion of polysulfides by diatomite/MXene hybrid interlayer for stable Li-S batteries

Fan, Zehui; Zhang, Chen; Hua, Wuxing; Li, Huan; Jiao, Yan; Xia, Jun; Geng, Chuannan; Meng, Rongwei; Liu, Yingxin; Tang, Quanjun; Lu, Ziyang; Shang, Tongxin; Ling, Guowei; Yang, Quan‐Hong

doi:10.1016/j.jechem.2021.04.038

Cited by 52 publications

(22 citation statements)

References 54 publications

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“…The obvious charge transfer from Li in Li 2 S 4 to O in montmorillonite can be observed. 43 These theoretical calculation results demonstrate the strong anchoring of polysulfides on montmorillonite due to the interaction between Li and O. [44][45][46] Based on the above findings, the functional CoS 2 @montmorillonite can be employed as an efficient polysulfide barrier with excellent Li + transfer performance for improving the cycling stability and rate performance of Li-S batteries.…”

Section: Resultsmentioning

confidence: 66%

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CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

Zhao

Dai

et al. 2022

Inorg. Chem. Front.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 78%

CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

Zhao

Dai

et al. 2022

Inorg. Chem. Front.

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“…Similarly, the Co 2p 1/2 peaks at 793.1 and 796.8 eV also shift by 1.2 and 0.8 eV, respectively, toward higher binding energies after capturing Li 2 S 6 (Figure b) . In the corresponding Li 1s spectra in Figure S6, a new peak located at 55.8 eV is observed, which is ascribed to the Li–N binding after the adsorption of Li 2 S 6 . , Density functional theory (DFT) calculation was also performed to disclose the interfacial interaction between CC@CoSNC and LiPSs at the atomic level. As shown in Figure c, the binding energy of Li 2 S 6 on the surface of CoS 1.097 with optimized adsorption configuration is −4.30 eV, much higher than those of pure carbon (−0.53 eV) and nitrogen-doped carbon (−0.87 eV) in previous literature, convincingly demonstrating the CoS 1.097 NCs in CC@CoSNC are the main polysulfide-anchoring sites .…”

Section: Resultsmentioning

confidence: 99%

“Dual Mediator System” Enables Efficient and Persistent Regulation toward Sulfur Redox Conversion in Lithium–Sulfur Batteries

et al. 2022

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Li–S batteries present great potential to realize high-energy-density storage, but their practical implementation is severely hampered by the notorious polysulfide shuttling and the sluggish redox kinetics. While rationally designed redox mediators can optimize polysulfide conversion, the efficiency and stability of such a mediation process still remain formidable challenges. Herein, a strategy of constructing a “dual mediator system” is proposed for achieving efficient and durable modulation of polysulfide conversion kinetics by coupling well-selected solid and electrolyte-soluble mediators. Theoretical prediction and detailed electrochemical analysis reveal the structure–activity relationships of the two mediators in synergistically optimizing the redox conversions of sulfur species, thus achieving a deeper mechanistic understanding of a function-supporting mediator system design toward sulfur electrochemistry promotion. Specifically, such a dual mediator system realizes the bridging of full-range “electrochemical catalysis” and strengthened “chemical reduction” processes of sulfur species as well as greatly suppressed mediator deactivation/loss due to the beneficial interactions between each mediator component. Attributed to these advantageous features, the Li–S batteries enable a slow capacity decay of 0.026% per cycle over 1200 cycles and a desirable capacity of 8.8 mAh cm–2 with 8.2 mg cm–2 sulfur loading and lean electrolyte condition. This work not only proposes an effective mediator system design strategy for promoting Li–S battery performance but also inspires its potential utilization facing other analogous sophisticated electrochemical conversion processes.

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“…MSBs mainly have problems such as low charging efficiency, high self‐discharge rate, short cycle life, and poor safety 10,15‐17 . These problems are related to the dissolution of polysulfides in liquid electrolytes 18‐20 . Therefore, at this stage, MSBs represented by Li‐S batteries need framework materials that can support ultra‐high S loading, ultra‐high activity, and ultra‐high conductivity 21‐23 …”

Section: Introductionmentioning

confidence: 99%

Atomic surface modification strategy ofMXenematerials forhigh‐performancemetal sulfur batteries

Wang

Zhang

et al. 2022

Intl J of Energy Research

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Improved MXenes based on heteroatom doping endow them with various new or optimized physicochemical, optical and structural properties. This greatly expands the library of MXenes materials and their potential for a range of applications. In this article, we comprehensively and critically discuss the synthesis and performance of the growing heteroatom doping and its family of composite MXenes materials in metal-sulfur batteries. We first summarize the heteroatom doping and its composite strategy of high-performance MXenes and analyze and summarize the mechanism of atomic element doping from three aspects: structure optimization, functional substitution and interface modification, aiming to provide clues for the development of new controllable synthetic routes. Emerging synthesis and optimization mechanisms related to metal-sulfur batteries are highlighted. Finally, we propose future opportunities and challenges for multifunctional high-performance MXenes research and metal-sulfur batteries. This work could open up new prospects for the development of high-performance MXenes in metal-sulfur batteries.

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Enhanced chemical trapping and catalytic conversion of polysulfides by diatomite/MXene hybrid interlayer for stable Li-S batteries

Cited by 52 publications

References 54 publications

CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

“Dual Mediator System” Enables Efficient and Persistent Regulation toward Sulfur Redox Conversion in Lithium–Sulfur Batteries

Atomic surface modification strategy ofMXenematerials forhigh‐performancemetal sulfur batteries

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Enhanced chemical trapping and catalytic conversion of polysulfides by diatomite/MXene hybrid interlayer for stable Li-S batteries

Cited by 52 publications

References 54 publications

CoS2@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

CoS2@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

“Dual Mediator System” Enables Efficient and Persistent Regulation toward Sulfur Redox Conversion in Lithium–Sulfur Batteries

Atomic surface modification strategy ofMXenematerials forhigh‐performancemetal sulfur batteries

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CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries

CoS₂@montmorillonite as an efficient separator coating for high-performance lithium–sulfur batteries