Vertically rooting multifunctional tentacles on carbon scaffold as efficient polysulfide barrier toward superior lithium-sulfur batteries

Zhang, Junfan; Li, Gaoran; Zhang, Yongguang; Zhang, Wen; Wang, Xin; Zhao, Yan; Li, Jingde

doi:10.1016/j.nanoen.2019.103905

Cited by 124 publications

(56 citation statements)

References 40 publications

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“…As shown in the inset of Figure 3d, after soaking CNTs/HNC‐800 in the Li 2 S 6 electrolyte solution for several hours, the yellowish color of Li 2 S 6 completely diminishes, while it only slightly fades for CNTs sample. Consistent results are also observed in the UV‐vis absorption spectra, as evidenced by the disappearance of the strong absorbance peak of Li 2 S 6 solution centered at about 420 nm [42–44] after the addition of CNTs/HNC‐800. These observations confirm that CNTs/HNC‐800 shows a strong adsorption ability towards polysulfides, which is beneficial to enhancing the operation stability of Li‐S batteries.…”

Section: Resultssupporting

confidence: 80%

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

et al. 2020

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Effectively confining lithium polysulfides inside porous material matrix with a high electrical conductivity represents a judicious way to extend lifespan and enhance rate performance of lithium‐sulfur (Li‐S) batteries. Herein, nitrogen‐doped hollow carbon polyhedrons with a thin CNTs conductive surface layer (CNTs/HNC) were prepared by directly pyrolyzing the CNTs coated ZIF‐8 polyhedrons crystallite precursors, and subsequently served as sulfur hosts in Li‐S batteries. The resulted product CNTs/HNC‐800 comprises a nitrogen content of 4.94 at.% as well as a high electrical conductivity of 8.43×10−1 S cm−1, which help to effectively adsorb/confine lithium polysulfides and substantially improve the rate capacity of Li‐S batteries. With a sulfur loading of 1.60 mg cm−2, the S@CNTs/HNC based cathode shows a discharge capacity of 870.7 mAh g−1 at 1.0 C, and can maintain 76.4 % of its initial capacity after 500 charge‐discharge cycles, corresponding to a capacity fade rate of only 0.047 % per cycle. While with a higher sulfur loading of 2.46 mg cm−2, a discharge capacity of 649.7 mAh g−1 can be achieved at 0.5 C, along with a capacity fade rate of merely 0.044 % per cycle during 200 cycles. When sulfur loading is further increased to 5.39 mg cm−2, it can also maintain a considerable initial discharge capacity of 812 mAh g−1 at 0.1 C. This work enriches the ways to prepare complicate nano structured sulfur hosts for long‐life and high‐rate Li‐S batteries.

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Section: Resultssupporting

confidence: 80%

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

et al. 2020

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“…Generally, combining with the chemical vapor deposition (CVD), LDHs are enriched in nitrogen element by the pyrolysis of ZIF which helps to absorb lithium polysulfides. Applying this method, Zhang et al [34] prepared hollow polyhedral NiCoZn LDHs through ZIF-67 tightly and uniformly embedded on carbon nanofibers (CNFs). The structure offered a favorable mechanical robustness and 3D long-range conductivity for sulfur electrochemical reactions.…”

Section: Polyhedron and Core-shell Structurementioning

confidence: 99%

Advances in preparation methods and mechanism analysis of layered double hydroxide for lithium-ion batteries and lithium-sulfur batteries

Deng

Cheng

et al. 2021

Journal of Energy Chemistry

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“…Since "polysulfide catalysis" is a relatively new concept, the exploration of more catalyst candidates with high activity and low cost, as well as a more efficient catalytic polysulfide conversion is a priority area of research. Currently, various transition metals are widely used to speed up the electrochemical reaction rates, according to results from Li-S battery [19][20][21][22][23]. For instance, wang's group reported that monodisperse cobalt atoms embedded in grapheme can trigger the surface-mediated reaction of Li polysulfides since the Co-N-C coordination center serves as a bifunctional electrocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalytic Conversion of Polysulfides by Biomimetic Design of “Branch-Leaf” Electrode for High-Energy Sodium–Sulfur Batteries

Shen

et al. 2021

Nano-Micro Lett.

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Rechargeable room temperature sodium–sulfur (RT Na–S) batteries are seriously limited by low sulfur utilization and sluggish electrochemical reaction activity of polysulfide intermediates. Herein, a 3D “branch-leaf” biomimetic design proposed for high performance Na–S batteries, where the leaves constructed from Co nanoparticles on carbon nanofibers (CNF) are fully to expose the active sites of Co. The CNF network acts as conductive “branches” to ensure adequate electron and electrolyte supply for the Co leaves. As an effective electrocatalytic battery system, the 3D “branch-leaf” conductive network with abundant active sites and voids can effectively trap polysulfides and provide plentiful electron/ions pathways for electrochemical reaction. DFT calculation reveals that the Co nanoparticles can induce the formation of a unique Co–S–Na molecular layer on the Co surface, which can enable a fast reduction reaction of the polysulfides. Therefore, the prepared “branch-leaf” CNF-L@Co/S electrode exhibits a high initial specific capacity of 1201 mAh g−1 at 0.1 C and superior rate performance.

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Vertically rooting multifunctional tentacles on carbon scaffold as efficient polysulfide barrier toward superior lithium-sulfur batteries

Cited by 124 publications

References 40 publications

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Nitrogen‐Doped Hollow Carbon Polyhedrons with Carbon Nanotubes Surface Layers as Effective Sulfur Hosts for High‐Rate, Long‐Lifespan Lithium–Sulfur Batteries

Advances in preparation methods and mechanism analysis of layered double hydroxide for lithium-ion batteries and lithium-sulfur batteries

Efficient Catalytic Conversion of Polysulfides by Biomimetic Design of “Branch-Leaf” Electrode for High-Energy Sodium–Sulfur Batteries

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