Cobalt-decorated carbon nanotube bottlebrushes for boosting polysulfide conversion in lithium-sulfur batteries

Huang, Junlong; Leng, Kunyi; Cen, Zongheng; Liu, Ruliang; Zhu, Youlong; Liu, Shaohong; Fu, Ruowen; Wu, Dingcai

doi:10.1007/s40843-022-2303-0

Cited by 13 publications

(1 citation statement)

References 73 publications

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“…Wang et al proposed CoS 2 nanospheres anchored on a 3D nitrogen-doped carbon skeleton as lithium–sulfur batteries with efficient sulfur hosts, demonstrating that N-doped carbon nanofiber skeletons with polar CoS 2 can achieve synergistic physisorption/chemisorption and effective catalytic conversion of polysulfides, − which contributes to enhanced sulfur redox kinetics and effective suppression of shuttle effects. Huang et al utilized Co nanoparticles as catalytic sites to controllably graft hairy carbon nanotubes on the surface of hybrid carbon nanotube skeletons. This topology provided an effective surface/interface and highly conductive network, while the codecorated hybrid backbone promoted the reaction kinetics of sulfur redox transformation.…”

Section: Introductionmentioning

confidence: 99%

N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

Jin,

Liu,

Hong

et al. 2024

J. Phys. Chem. C

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Heterojunction structures as an advanced strategy may promote the synergistic effect of different component materials; the rational design of heterojunctions allows them to exhibit various advantages when applied to lithium–sulfur batteries. Hollow CoSn(OH)6 was used as a precursor, and polyacrylonitrile PAN and sulfur powder were used as raw materials. N-doped carbon nanofiber-encapsulated CoS2/SnS2 heterostructured materials CoS2/SnS2@CNFs were prepared by an electrostatic spinning technique and in situ vulcanization and applied to the lithium–sulfur battery cathode. A hollow cubic material with structural stability and a physical domain-limiting effect, that is, the CoS2/SnS2 heterostructure, was effectively constructed, and rapid charge transfer was realized by a built-in electric field induced to form by the heterogeneous interface. Meanwhile, the fiber-like network structure facilitates the wetting of the electrolyte and shortens the ion transfer path. The results show that a CoS2/SnS2@CNFs@S-based battery exhibits an excellent electrochemical performance. The initial discharge specific capacities were 1204.3 mAh g–1 at a current density of 0.1 C and 615.2 mAh g–1 at 4 C. The long-cycle performance showed that the cells only exhibited an ultralow decay rate of 0.067% per week on average after 1000 cycles at 2C. When the sulfur loading was increased to 5.3 mg cm–2 and the electrolyte/sulfur ratio was 6 μL mg–1, excellent cycling stability was still demonstrated after 250 weeks of cycling at 0.2C.

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Section: Introductionmentioning

confidence: 99%

N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

Jin,

Liu,

Hong

et al. 2024

J. Phys. Chem. C

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Unveiling the Role of Electric Double‐Layer in Sulfur Catalysis for Batteries

Geng,

Jiang,

Hong

et al. 2024

Advanced Materials

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The metal‐catalyzed sulfur reaction in lithium–sulfur (Li–S) batteries usually suffers from the strong binding of sulfur species to the catalyst surface, which destroys the electric double layer (EDL) region there. This causes rapid catalyst deactivation because it prevents the desorption of sulfur species and mass transport through the EDL is hindered. This work introduces a competitive adsorption factor (fsulfur) as a new indicator to quantify the competitive adsorption of sulfur species in the EDL and proposes an alloying method to change it by strengthening the p–d hybridization of alloying metals with electrolyte solvents. A cobalt–zinc alloy catalyst with a moderate fsulfur lowers the activation energy of the rate‐limiting step of the conversion of lithium polysulfides to lithium sulfide, giving a platform capacity proportion that is 96% of the theoretical value and has a greatly improved anti‐passivation ability, especially at high sulfur loadings and lean electrolyte conditions (a low E/S ratio of 5 µL mgS−1). A pouch cell using this approach has a high energy density of up to 464 Wh kg−1. Such a competitive adsorption indicator and alloying strategy offer a new guideline for catalyst design and a practical electrocatalysis solution for Li–S batteries.

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Densely Branched Carbon Nanotubes for Boosting the Electrochemical Performance of Li‐S Batteries

Zheng,

Gao,

Xia

et al. 2024

ChemSusChem

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To address the inherent limitations of conventional carbon nanotubes (CNTs), such as their tendency to agglomerate and scarcity of catalytic sites, the development of branched carbon nanotubes (BCNTs) with a unique hierarchical structure has emerged as a promising solution. Herein, gram scale quantities of densely branched and structurally consistent Ni‐Fe decorated branched CNTs (Ni‐Fe@BCNT) have been prepared. This uniform and densely branched architecture ensures excellent dispersibility and superior electrical conductivity. Additionally, each branched tip is equipped with Ni‐Fe particles, thereby providing numerous catalytic sites which endow them with exceptional catalytic activity for the conversion of polysulfides. The polypropylene (PP) separator modified with Ni‐Fe@BCNT interlayer is fabricated as a multifunctional barrier for Li–S batteries. The experimental results demonstrate that Ni‐Fe@BCNT interlayer can effectively suppress the shuttle effect of polysulfides and enhance their redox kinetics. The outstanding catalytic ability of Ni‐Fe@BCNT interlayer enables batteries with high specific capacities, outstanding rate performance, and remarkable cycling stability. This approach proposed in this work paves a new path for synthesizing BCNTs and shows great potential for scaling up the production of BCNTs to address more demanding applications.

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Cobalt-decorated carbon nanotube bottlebrushes for boosting polysulfide conversion in lithium-sulfur batteries

Cited by 13 publications

References 73 publications

N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

Unveiling the Role of Electric Double‐Layer in Sulfur Catalysis for Batteries

Densely Branched Carbon Nanotubes for Boosting the Electrochemical Performance of Li‐S Batteries

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Cobalt-decorated carbon nanotube bottlebrushes for boosting polysulfide conversion in lithium-sulfur batteries

Cited by 13 publications

References 73 publications

N-Doped Carbon Fiber-Encapsulated CoS2/SnS2 Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

N-Doped Carbon Fiber-Encapsulated CoS2/SnS2 Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

Unveiling the Role of Electric Double‐Layer in Sulfur Catalysis for Batteries

Densely Branched Carbon Nanotubes for Boosting the Electrochemical Performance of Li‐S Batteries

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N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries

N-Doped Carbon Fiber-Encapsulated CoS₂/SnS₂ Heterostructures Facilitate Polysulfide Conversion for Lithium–Sulfur Batteries