Ultra-thin 2D MoO2 nanosheets coupled with CNTs as efficient separator coating materials to promote the catalytic conversion of lithium polysulfides for advanced lithium-sulfur batteries

doi:10.1016/S1872-5805(21)60080-X

New Carbon Materials

Volume 36, Issue 4, August 2021, Pages 810-820

https://doi.org/10.1016/S1872-5805(21)60080-X Get rights and content

Abstract

The severe shuttle effect and slow kinetics of lithium polysulfide (LiPS) conversion are two major obstacles to the practical application of lithium sulfur batteries. Ultra-thin 2D MoO₂ nanosheets (MoO₂ NSs) have been synthesized by chemical vapor deposition and then mixed with carbon nanotubes (CNTs) using as coating materials of the Celgard 2400 polypropylene separator to solve these problems. The 2D character of MoO₂ NSs produced high surface/volume ratios and abundant active binding sites for anchoring LiPSs. In addition, the partial reduction of MoO₂ NSs in a H₂/Ar mixture introduced oxygen vacancies in their surface, which acted as catalytic sites for LiPS conversion, while the CNT network ensured rapid electron transfer for LiPS conversion reactions. Symmetric dummy cell tests showed that a 30wt%MoO₂/CNT coated separator reduced the energy barrier for Li₂S nucleation, and first-principles calculations verified its strong binding energy to entrap LiPSs and increase Li₂S precipitation. Because of these features, a cell with a 30wt%MoO₂/CNT coated separator had an improved specific capacity of 738 mAh·g⁻¹ at 1 C with a slow decay rate of 0.053% for 800 cycles.

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RESEARCH PAPERUltra-thin 2D MoO2 nanosheets coupled with CNTs as efficient separator coating materials to promote the catalytic conversion of lithium polysulfides for advanced lithium-sulfur batteries

Abstract

Joule

Joule

Applied Surface Science

Nano Energy

Energy Storage Materials

Lithium-sulfur batteries: progress and prospects [J]

Advanced Materials

Enhanced electrochemical kinetics on conductive polar mediators for lithium-sulfur batteries [J]

Angewandte Chemie International Edition

3D Porous carbon sheets with multidirectional ion pathways for fast and durable lithium-sulfur batteries [J]

Advanced Energy Materials

Revisiting the role of polysulfides in lithium-sulfur batteries [J]

Advanced Materials

Systematic study of effect on enhancing specific capacity and electrochemical behaviors of lithium-sulfur batteries [J]

Advanced Energy Materials

Facile synthesis of crumpled nitrogen-doped Mxene nanosheets as a new sulfur host for lithium-sulfur batteries [J]

Advanced Energy Materials

Dendrite-free lithium anodes with ultra-deep stripping and plating properties based on vertically oriented lithium-copper-lithium arrays [J]

Advanced Materials

Highly solvating electrolytes for lithium-sulfur batteries [J]

Advanced Energy Materials

Lithium bond chemistry in lithium-sulfur batteries [J]

Angewandte Chemie International Edition

Recent advances in separators to mitigate technical challenges associated with re-chargeable lithium sulfur batteries [J]

Journal of Materials Chemistry A

Synergistic electrocatalysis of polysulfides by a nanostructured VS4-carbon nanofiber functional separator for high-performance lithium-sulfur batteries [J]

Journal of Materials Chemistry A

Entrapping polysulfides by using ultrathin hollow carbon sphere-functionalized separators in high-rate lithium-sulfur batteries [J]

Journal of Materials Chemistry A

Multifunctional separator coatings for high-performance lithium-sulfur batteries [J]

Advanced Materials Interfaces

RESEARCH PAPER
Ultra-thin 2D MoO₂ nanosheets coupled with CNTs as efficient separator coating materials to promote the catalytic conversion of lithium polysulfides for advanced lithium-sulfur batteries

Synergistic electrocatalysis of polysulfides by a nanostructured VS₄-carbon nanofiber functional separator for high-performance lithium-sulfur batteries [J]