Self‐Supporting Carbon Nanofibers with Ni‐Single‐Atoms and Uniformly Dispersed Ni‐Nanoparticles as Scalable Multifunctional Hosts for High Energy Density Lithium‐Sulfur Batteries

Pei, Huayu; Yang, Quan; Yu, Jingkun; Song, Haoqiang; Zhao, Siyuan; Waterhouse, Geoffrey I.N.; Lu, Siyu

doi:10.1002/smll.202202037

Cited by 29 publications

(28 citation statements)

References 68 publications

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“…Therefore, this strategy shows great potential for application. Figure b shows the comparison of the rate performance of this work and other works. − The adsorption energy and charge density of Li 2 S 6 on the Co/Mn-GC@N–C surface are calculated to further verify the adsorption effect of the material on lithium polysulfide. Figure c shows the charge density of the Co/Mn-GC@NC surface when combined with Li 2 S 6 , where the cyan part and yellow part represent electron loss and gain, respectively.…”

Section: Resultsmentioning

confidence: 89%

Boosted Polysulfide Conversion by Co, Mn Bimetallic-Modulated Nitrogen–Carbon Material for Advanced Lithium–Sulfur Batteries

Luo

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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Lithium–sulfur batteries (LSBs) are regarded as one of the most promising future generation rechargeable battery energy storage devices due to their high theoretical specific capacity and energy density. However, the development of LSBs is largely influenced by the shuttle effect and slow kinetics of lithium polysulfides, which seriously hinder their commercial applications. Based on this, we propose a bimetallic modulating strategy to synthesize carbon tube embedded with Co and Mn bimetals anchored on a nitrogen-doped carbon nanosheet (Co/Mn-GC@N–C) function separator to catalytic polysulfide conversion and enhance the electrochemical performance. Co/Mn-GC@N–C possesses high electrical conductivity and large specific surface area, which can offer a lot of active sites for anchoring polysulfides, stimulating their redox reaction and quickening the electrode reaction kinetics. The comprehensive test results show that the cell with Co/Mn-GC@N–C exhibits a specific discharge capacity of 1215 mAh g–1 at 0.5C and a high Coulombic efficiency of 99.4% after 300 cycles; even the Co/Mn-GC@N–C cell with a high sulfur loading of 6.6 mg cm–2 shows a high area capacity of 5 mAh cm–2. Therefore, this bimetallic modulating strategy provides an option for the design of advanced high-performance lithium–sulfur battery separator materials.

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Section: Resultsmentioning

confidence: 89%

Boosted Polysulfide Conversion by Co, Mn Bimetallic-Modulated Nitrogen–Carbon Material for Advanced Lithium–Sulfur Batteries

Luo

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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“…This phenomenon may be due to the dual-anchoring effect of g-C 3 N 4 and graphene oxide for Co 2+ ions in the preparation of a precursor, effectively preventing the aggregation of Co-species in the calcination process. These ultra-small Co-based species can significantly catalyze the polysulfide conversion due to their high surface energy and more active terminations [ 30 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, recent studies have demonstrated that tailoring metal compounds to an ultra-small size, such as nanocrystals, nanodots, and clusters, and even to the single-atomic scale could generate strong adsorption and excellent catalytic activity for polysulfides, owing to enhanced surface energy and more active terminations [ 16 , 29 , 30 , 31 ]. However, it is a great challenge to fabricate highly dispersed ultrafine metal compounds because the isolated ultra-small particles with high surface energy can susceptibly agglomerate into big particles in the synthesis process.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Co-Species Interspersed g-C3N4 Nanosheets and Graphene as an Efficient Polysulfide Barrier to Enable High Performance Li-S Batteries

2023

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Lithium-sulfur (Li-S) batteries are regarded as one of the promising advanced energy storage systems due to their ultrahigh capacity and energy density. However, their practical applications are still hindered by the serious shuttle effect and sluggish reaction kinetics of soluble lithium polysulfides. Herein, g-C3N4 nanosheets and graphene decorated with an ultrafine Co-species nanodot heterostructure (Co@g-C3N4/G) as separator coatings were designed following a facile approach. Such an interlayer can not only enable effective polysulfide affinity through the physical barrier and chemical binding but also simultaneously have a catalytic effect on polysulfide conversion. Because of these superior merits, the Li-S cells assembled with Co@g-C3N4/G-PP separators matched with the S/KB composites (up to ~70 wt% sulfur in the final cathode) exhibit excellent rate capability and good cyclic stability. A high specific capacity of ~860 mAh g−1 at 2.0 C as well as a capacity-fading rate of only ~0.035% per cycle over 350 cycles at 0.5 C can be achieved. This bifunctional separator can even endow a Li-S cell at a low current density to exhibit excellent cycling capability, with a capacity retention rate of ~88.4% at 0.2 C over 250 cycles. Furthermore, a Li-S cell with a Co@g-C3N4/G-PP separator possesses a stable specific capacity of 785 mAh g−1 at 0.2 C after 150 cycles and a superior capacity retention rate of ~84.6% with a high sulfur loading of ~3.0 mg cm−2. This effective polysulfide-confined separator holds good promise for promoting the further development of high-energy-density Li-S batteries.

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“…A representative structural model of graphene fibers (GFs) from macroscale to atomic scale is shown in Fig. 6(a) [74]. Various methods to prepare GFs mainly include electrospinning, hydrothermal self-assembly, CVD, and so on.…”

Section: D Fiber Structurementioning

confidence: 99%

A review in rational design of graphene toward advanced Li–S batteries

Shi

Wang

et al. 2023

Nano Research Energy

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For lithium-sulfur (Li-S) batteries, the problems of polysulfides shuttle effect, slow dynamics of sulfur species and growth of lithium dendrite during charge/discharge processes have greatly impeded its practical development. Of core importance to advance the performances of Li-S batteries lies in the selection and design of novel materials with strong polysulfides adsorption ability and enhanced redox electrocatalytic behavior. Graphene, affording high electrical conductivity, superior carrier mobility, and large surface area, has presented great potentials in improving the performances of Li-S cells. However, the properties of intrinsic graphene are far enough to achieve the multiple management toward electrochemical catalysis of energy storage systems. In addition, a general and objective understanding of its role in Li-S systems is still lacking. Along this line, we summarize the design routes from three aspects, including defect engineering, dimension adjustment, and heterostructure modulation, to perfect the graphene properties. Thus-synthesized graphene materials are explored as multifunctional electrocatalysts targeting high-efficiency and long-lifespan Li-S batteries, based on which the regulating role of graphene is comprehensively analyzed. This project provides a perspective on the effective engineering management of graphene materials to boost Li-S chemistry, meanwhile promote the practical application process for graphene materials.

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Self‐Supporting Carbon Nanofibers with Ni‐Single‐Atoms and Uniformly Dispersed Ni‐Nanoparticles as Scalable Multifunctional Hosts for High Energy Density Lithium‐Sulfur Batteries

Cited by 29 publications

References 68 publications

Boosted Polysulfide Conversion by Co, Mn Bimetallic-Modulated Nitrogen–Carbon Material for Advanced Lithium–Sulfur Batteries

Boosted Polysulfide Conversion by Co, Mn Bimetallic-Modulated Nitrogen–Carbon Material for Advanced Lithium–Sulfur Batteries

Ultrafine Co-Species Interspersed g-C3N4 Nanosheets and Graphene as an Efficient Polysulfide Barrier to Enable High Performance Li-S Batteries

A review in rational design of graphene toward advanced Li–S batteries

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