Triple-Layered Carbon-SiO<sub>2</sub> Composite Membrane for High Energy Density and Long Cycling Li–S Batteries

Kou, Wei; Li, Xiangcun; Liu, Yang; Zhang, Xiaopeng; Yang, Shaoran; Jiang, Xiaobin; He, Gaohong; Dai, Yan; Zheng, Wenji; Yu, Guihua

doi:10.1021/acsnano.9b01703

Cited by 94 publications

(75 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the following anodic scan, the two characteristic peaks (≈2.32 and 2.38 V) are attributed to the reverse oxidation process from short‐chain sulfides to S 8 . Meanwhile, the fifth‐cycle CV curve is highly similar to the second cycle curves, suggesting a high reversibility and stability of MC‐NS/S electrode …”

Section: Methodsmentioning

confidence: 99%

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

Chen

et al. 2019

Advanced Energy Materials

101

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

Section: Methodsmentioning

confidence: 99%

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

Chen

et al. 2019

Advanced Energy Materials

101

View full text Add to dashboard Cite

show abstract

“…Lithium–sulfur (Li–S) batteries are regarded as one of the most prospective candidates for next‐generation energy storage devices due to their ultrahigh theoretical energy density . The electrical energy storage of a typical Li–S battery is achieved via the electrochemical reaction of 16Li + S 8 → 8Li 2 S . In the cathode side, the sulfur was first reduced by the transferred Li + to long‐chain lithium polysulfide species (Li 2 S x , 4 ≤ x ≤ 8) and then to insoluble short‐chain sulfide species (Li 2 S 2 /Li 2 S) during the discharging process .…”

mentioning

confidence: 99%

Designing a Multifunctional Separator for High‐Performance Li–S Batteries at Elevated Temperature

et al. 2019

Small

View full text Add to dashboard Cite

The practical applications of lithium–sulfur (Li–S) batteries are seriously limited by the undesirable polysulfide shuttling and lithium dendrite growth. Herein, a multifunctional membrane is designed and prepared by coating a lithiated Nafion (Li@Nafion) layer and an Al2O3 layer on the two sides of a routine polymer membrane (polypropylene/polyethylene/polypropylene, PEP). The Li@Nafion layer faced to the sulfur cathode builds a “polysulfide‐phobic” surface to restrain the shuttle effect via Coulomb repulsion, while the Al2O3 layer with a uniform porous structure aids in regulating homogeneous Li+ fluxes to achieve stable Li electrodeposition. As a result, the Li//Li symmetric cell with a Li@Nafion/PEP/Al2O3 (LNPA) separator realizes stable Li plating/striping even after 1000 h at a high current density (5 mA cm−2). Moreover, the Li–S batteries incorporating LNPA separators not only can achieve excellent outstanding cyclic stability at an ultrahigh sulfur loading (7.6 mg cm−2), but also exhibit impressive electrochemical performance at an elevated temperature (60 °C). The rational design of the LNPA separator presents new insights to develop high‐performance Li–S batteries.

show abstract

“…Additional references cited with the Supporting Information. [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80]…”

Section: Supporting Informationmentioning

confidence: 99%

A Synergistic Strategy with 3D Highly Conductive Carbon Matrix‐Decorated with Low Loading of CdS Quantum Dots as a Sulfur Host for Advanced Li−S Batteries

et al. 2021

ChemElectroChem

View full text Add to dashboard Cite

Lithium-sulfur batteries (LSBs) have become one of the most competitive candidates for next generation energy storage systems due to the high theoretical energy density, nevertheless, the severe shuttle effect, volume expansion, and poor electrical conductivity restrict their practical application. Herein, we report a synergistic combination of 3D carbon matrix (CdS@NG-CNT) composed of low-defect carbon nanotubes (CNTs) and nitrogen-doped graphene (NG) decorated with low loading of cadmium sulfide quantum dots as sulfur host and carbon black (CB) as separator layer to collectively solve these issues. Specifically, the developed host material possesses abundant macropores and mesopores and high electrical conductivity, which endow the carbon matrix multifaceted structural properties for polysulfides immobilization, electrons/ Li + transfer, and Li 2 S formation, as well as buffering the volume expansion during cycling. The CB-modified separator can help to enhance the interconversion of intercepted polysulfides. Benefiting from these aspects, the cell equipped with CdS@NG-CNT/S//CB-PP exhibits a superior rate capacity of 1493.6 mA h/g at 0.2 C (1 st ), and maintains a capacity of 479.7 mA h/g after 1050 cycles with an ultralow capacity decay rate of 0.051 % at 1.0 C. This work provides a useful strategy to solve issues of the current LSBs, which may practically be used in the high-energy density.

show abstract

Triple-Layered Carbon-SiO₂ Composite Membrane for High Energy Density and Long Cycling Li–S Batteries

Cited by 94 publications

References 55 publications

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

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

Designing a Multifunctional Separator for High‐Performance Li–S Batteries at Elevated Temperature

A Synergistic Strategy with 3D Highly Conductive Carbon Matrix‐Decorated with Low Loading of CdS Quantum Dots as a Sulfur Host for Advanced Li−S Batteries

Contact Info

Product

Resources

About

Triple-Layered Carbon-SiO2 Composite Membrane for High Energy Density and Long Cycling Li–S Batteries

Cited by 94 publications

References 55 publications

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

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

Designing a Multifunctional Separator for High‐Performance Li–S Batteries at Elevated Temperature

A Synergistic Strategy with 3D Highly Conductive Carbon Matrix‐Decorated with Low Loading of CdS Quantum Dots as a Sulfur Host for Advanced Li−S Batteries

Contact Info

Product

Resources

About

Triple-Layered Carbon-SiO₂ Composite Membrane for High Energy Density and Long Cycling Li–S Batteries