Ultrahigh-Volumetric-Energy-Density Lithium–Sulfur Batteries with Lean Electrolyte Enabled by Cobalt-Doped MoSe2/Ti3C2Tx MXene Bifunctional Catalyst
- 12 July 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 15 (7), 11619-11633
- https://doi.org/10.1021/acsnano.1c02047
Abstract
It is a significant challenge to design a dense high-sulfur-loaded cathode and meanwhile to acquire fast sulfur redox kinetics and suppress the heavy shuttling in the lean electrolyte, thus to acquire a high volumetric energy density without sacrificing gravimetric performance for realistic Li–S batteries (LSBs). Herein, we develop a cation-doping strategy to tailor the electronic structure and catalytic activity of MoSe2 that in situ hybridized with conductive Ti3C2Tx MXene, thus obtaining a Co-MoSe2/MXene bifunctional catalyst as a high-efficient sulfur host. Combining a smart design of the dense sulfur structure, the as-fabricated highly dense S/Co-MoSe2/MXene monolith cathode (density: 1.88 g cm–3, conductivity: 230 S m–1) achieves a high reversible specific capacity of 1454 mAh g–1 and an ultrahigh volumetric energy density of 3659 Wh L–1 at a routine electrolyte and a high areal capacity of ∼8.0 mAh cm–2 under an extremely lean electrolyte of 3.5 μL mgs–1 at 0.1 C. Experimental and DFT theoretical results uncover that introducing Co element into the MoSe2 plane can form a shorter Co–Se bond, impel the Mo 3d band to approach the Fermi level, and provide strong interactions between polysulfides and Co-MoSe2, thereby enhancing its intrinsic electronic conductivity and catalytic activity for fast redox kinetics and uniform Li2S nucleation in a dense high-sulfur-loaded cathode. This deep work provides a good strategy for constructing high-volumetric-energy-density, high-areal-capacity LSBs with lean electrolytes.Keywords
Funding Information
- National Natural Science Foundation of China (21805297, 51972066)
- Natural Science Foundation of Guangdong Province (2021A1515011718)
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2017)
This publication has 64 references indexed in Scilit:
- High-performance transition metal–doped Pt 3 Ni octahedra for oxygen reduction reactionScience, 2015
- Metallic 1T phase MoS2 nanosheets as supercapacitor electrode materialsNature Nanotechnology, 2015
- Sulfur Cathodes Based on Conductive MXene Nanosheets for High‐Performance Lithium–Sulfur BatteriesAngewandte Chemie, 2015
- Sulfur Cathodes Based on Conductive MXene Nanosheets for High‐Performance Lithium–Sulfur BatteriesAngewandte Chemie, 2015
- The chemistry of two-dimensional layered transition metal dichalcogenide nanosheetsNature Chemistry, 2013
- Two-Dimensional Transition Metal CarbidesACS Nano, 2012
- Electrical Energy Storage for the Grid: A Battery of ChoicesScience, 2011
- Single‐Layer Semiconducting Nanosheets: High‐Yield Preparation and Device FabricationAngewandte Chemie, 2011
- Single‐Layer Semiconducting Nanosheets: High‐Yield Preparation and Device FabricationAngewandte Chemie, 2011
- Biomimetic Hydrogen Evolution: MoS2Nanoparticles as Catalyst for Hydrogen EvolutionJournal of the American Chemical Society, 2005