Lithium-sulfur (Li-S) batteries have emerged as a leading candidate for next-generation energy storage systems due to their exceptional theoretical energy density of up to 2600 Wh kg⁻¹ and low material cost. Despite these advantages, practical implementation remains hindered by persistent challenges such as the polysulfide shuttle effect and sluggish redox kinetics during charge-discharge cycles. This study presents a novel phosphorus-doped cobalt sulfide (P-CoS₂) nanobox architecture derived from cobalt-based metal-organic frameworks (Co-MOFs), which demonstrates remarkable improvements in both polysulfide adsorption and catalytic conversion.2996998-09-3 References The hollow porous structure of P-CoS₂ not only facilitates rapid ion and electron transport but also accommodates the significant volume expansion of sulfur during cycling.75747-14-7 Biological Activity Phosphorus doping introduces abundant Co-O-P-like species on the surface, which significantly enhances chemical binding with polysulfides through the formation of Li-P, P-S, and strengthened Co-S bonds. Additionally, the electron-rich environment created by phosphorus promotes the cleavage of S-S bonds in adsorbed polysulfides, accelerating their conversion into insoluble Li₂S₂/Li₂S.PMID:30521183 A modified separator was fabricated by coating a hybrid layer of P-CoS₂ and carbon nanotubes (CNTs) onto a commercial Celgard 2500 membrane, designated as P-CoS₂/CNTs@Celgard. Electrochemical evaluations reveal that cells equipped with this functional separator exhibit a high reversible capacity of 1643 mAh g⁻¹ at 0.1 C and maintain 802.6 mAh g⁻¹ even at 5.0 C. After 580 cycles at 2.0 C, the capacity retention remains at 635.5 mAh g⁻¹ with a minimal degradation rate of 0.066% per cycle and a Coulombic efficiency exceeding 98%. Notably, under high sulfur loading conditions (4.8 mg cm⁻²), the areal capacity stabilizes at 4.5 mAh cm⁻² after 100 cycles at 0.2 C. These results highlight the effectiveness of phosphorus doping in tailoring the surface chemistry of transition-metal sulfides, enabling stronger interfacial interactions with polysulfides and significantly improving redox kinetics. The work provides strong evidence that anion doping strategies can be effectively leveraged to engineer polar surfaces in metal compounds, offering new insights into designing advanced functional materials for high-performance Li-S batteries.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
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