Accelerated polysulfide redox kinetics revealed by ternary sandwich-type S@Co/N-doped carbon nanosheet for high-performance lithium-sulfur batteries

Zhong, Mei-e; Guan, Jindiao; Feng, Quan; Wu, Xiongwei; Xiao, Zhubing; Zhang, Wei; Tong, Shuai; Zhou, Nan; Gong, Daoxin

doi:10.1016/j.carbon.2017.11.084

Cited by 118 publications

(43 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three characteristic peaks were located at 398.6, 400.8, and 401.3 eV, which corresponded to pyridinic, pyrrolic, and graphitic N species, respectively . Figure 2i shows two characteristic peaks located at 780.3 and 795.9 eV in the high‐resolution Co 2p spectrum, which are attributed to the metallic cobalt . Previous reports illustrate that a N‐doped carbon surface facilitates the oxidization of Li 2 S n ( n = 3–8) by enhancing the adsorption energy and, consequently, improves the sulfur utilization and cyclic performance …”

Section: Resultsmentioning

confidence: 84%

Highly Dispersed Cobalt Clusters in Nitrogen‐Doped Porous Carbon Enable Multiple Effects for High‐Performance Li–S Battery

Wang

Yang

Chen

et al. 2020

Advanced Energy Materials

221

146

View full text Add to dashboard Cite

The lithium–sulfur (Li–S) battery is considered a promising candidate for the next generation of energy storage system due to its high specific energy density and low cost of raw materials. However, the practical application of Li–S batteries is severely limited by several weaknesses such as the shuttle effect of polysulfides and the insulation of the electrochemical products of sulfur and Li2S/Li2S2. Here, by doping nitrogen and integrating highly dispersed cobalt catalysts, a porous carbon nanocage derived from glucose adsorbed metal–organic framework is developed as the host for a sulfur cathode. This host structure combines the reported positive effects, including high conductivity, high sulfur loading, effective stress release, fast lithium‐ion kinetics, fast interface charge transport, fast redox of Li2Sn, and strong physical/chemical absorption, achieving a long cycle life (86% of capacity retention at 1C within 500 cycles) and high rate performance (600 mAh g−1 at 5C) for a Li–S battery. By combining experiments and density functional theoretical calculations, it is demonstrated that the well‐dispersed cobalt clusters play an important role in greatly improving the diffusion dynamics of lithium, and enhance the absorption and conversion capability of polysulfides in the host structure.

show abstract

Section: Resultsmentioning

confidence: 84%

Highly Dispersed Cobalt Clusters in Nitrogen‐Doped Porous Carbon Enable Multiple Effects for High‐Performance Li–S Battery

Wang

Yang

Chen

et al. 2020

Advanced Energy Materials

221

146

View full text Add to dashboard Cite

show abstract

“…3 e, the Co-NC electrode delivers a higher K + diffusion coefficient than NC and graphite throughout the (de)potassiation process, which is in good agreement with the EIS results. These results further demonstrate that the presence of cobalt nanoparticles, nitrogen dopants, and Co–N bonds effectively enhances the electronic conductivity, generates active sites, and promotes the charge transfer behavior, synergistically endowing the Co-NC anode with a faster diffusion kinetics [ 52 , 53 ]. Moreover, the morphology and composition of the Co-NC electrode at fully discharged and charged states were characterized by TEM, HRTEM, and EDS, to confirm its structural evolution.…”

Section: Resultsmentioning

confidence: 92%

Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

Shi

Han

et al. 2020

Nano-Micro Lett.

View full text Add to dashboard Cite

Potassium-ion batteries (KIBs) have great potential for applications in large-scale energy storage devices. However, the larger radius of K+ leads to sluggish kinetics and inferior cycling performance, severely restricting its practical applicability. Herein, we propose a rational strategy involving a Prussian blue analogue-derived graphitized carbon anode with fast and durable potassium storage capability, which is constructed by encapsulating cobalt nanoparticles in nitrogen-doped graphitized carbon (Co-NC). Both experimental and theoretical results show that N-doping effectively promotes the uniform dispersion of cobalt nanoparticles in the carbon matrix through Co–N bonds. Moreover, the cobalt nanoparticles and strong Co–N bonds synergistically form a three-dimensional conductive network, increase the number of adsorption sites, and reduce the diffusion energy barrier, thereby facilitating the adsorption and the diffusion kinetics. These multiple effects lead to enhanced reversible capacities of 305 and 208.6 mAh g−1 after 100 and 300 cycles at 0.05 and 0.1 A g−1, respectively, demonstrating the applicability of the Co-NC anode for KIBs.

show abstract

“…The high‐resolution Co 2p 3/2 spectrum illustrated in Figure S4c (Supporting Information) is deconvoluted into two characteristic peaks centers on 778.6 and 780.4 eV, which confirms the existence of metallic cobalt and CoN bond. According to previous literature reports, CoNC structure plays an effective role in the catalytic conversion of polysulfides …”

Section: Methodsmentioning

confidence: 87%

“…[33,34] The N 1s spectrum exhibits three obviously peaks at a binding energy of 398.8 eV (Pyridinic-N), 401.3 eV (Pyrrolic-N), and 401.3 eV (Graphitic-N), respectively ( Figure S4b, Supporting Information). [35][36][37] Adv. According to previous literature reports, CoNC structure plays an effective role in the catalytic conversion of polysulfides.…”

mentioning

confidence: 99%

Polysulfide Confinement and Highly Efficient Conversion on Hierarchical Mesoporous Carbon Nanosheets for Li–S Batteries

Chen

et al. 2019

Advanced Energy Materials

105

View full text Add to dashboard Cite

performance of Li-S batteries is still restricted by poor conductivity of sulfur itself and discharge products (Li 2 S/Li 2 S 2 ), which makes hard conversion of sulfur. Additionally, the common shuttle effect of intermediate polysulfide also leads to an obvious capacity loss during charging and discharging. [10][11][12][13][14][15] Thus, new strategies are urgent in addressing the problems of high-capacity sulfur cathodes for Li-S batteries.To design high-performance cathode, dispersing nanostructured sulfur particles on carbon materials have attracted particular interests, which not only stabilize sulfur and intermediates but also promotes electron transfer during charging/ discharging. [16][17][18][19][20][21] Although carbon materials have been the first choice to disperse sulfur particles, the nonpolar carbon suffers a weak binding force to the intermediate product, which results in serious shuttle effect and making it difficult to reuse the polysulfide (Scheme 1a). To address these issues, plenty of work has begun to focus on the modification of nonpolar carbon by introducing heteroatoms (B, N, O, or S). [22][23][24][25] This is because the lone pair of electrons on the heteroatoms forms an electrostatic attraction (Li bond) with the polysulfide, which can effectively prevent shuttle of polysulfides. [26,27] However, the high loading and the easy aggregation of sulfur are hard to be balanced, since sulfur are getting easier to migrate and aggregate at surface of carbon supports, which lead to the low concentration loading or limited sulfur utilization. Therefore, sulfur confinement and simultaneous highly efficient conversion remains a challenge for the next-generation Li-S batteries.Herein, we develop honeycomb-like mesoporous carbon nanosheets (MC-NS) with abundant defects and Co-N-C catalytic site as efficient host for simultaneously confinement and efficient conversion of polysulfides, which shows significantly enhanced performance for Li-S batteries cathode (Scheme 1b). The as-prepared MC-NS exhibits an excellent 2D conductive network with a high specific surface area of 335.4 m 2 g −1 and abundant mesopores that provide high storage space and expansion space for sulfur. Moreover, the density functional theory (DFT) calculation and experiments manifest that the presence of abundant defects on the carbon skeleton MC-Ns Lithium-sulfur (Li-S) batteries have attracted increasing attention due to their extremely high theoretical specific capacity and a promising power density. However, practical applications of Li-S batteries are still limited by the relatively low performance, owing to poor conductivity of sulfur itself and discharge products (Li 2 S/Li 2 S 2 ) as well as the shuttle effect of the intermediate polysulfide. Herein, honeycomb-like mesoporous Co, N-doped carbon nanosheets (MC-NS) with a high specific surface area and abundant defects are developed which, simultaneously enable polysulfide confinement and highly efficient conversion. Moreover, density functional theory calculations and experime...

show abstract

Accelerated polysulfide redox kinetics revealed by ternary sandwich-type S@Co/N-doped carbon nanosheet for high-performance lithium-sulfur batteries

Cited by 118 publications

References 56 publications

Highly Dispersed Cobalt Clusters in Nitrogen‐Doped Porous Carbon Enable Multiple Effects for High‐Performance Li–S Battery

Highly Dispersed Cobalt Clusters in Nitrogen‐Doped Porous Carbon Enable Multiple Effects for High‐Performance Li–S Battery

Highly Dispersed Cobalt Nanoparticles Embedded in Nitrogen-Doped Graphitized Carbon for Fast and Durable Potassium Storage

Polysulfide Confinement and Highly Efficient Conversion on Hierarchical Mesoporous Carbon Nanosheets for Li–S Batteries

Contact Info

Product

Resources

About