Concurrent hetero-/homo-geneous electrocatalysts to bi-phasically mediate sulfur species for lithium–sulfur batteries
LingHu R.-B. Chen J.-X. Zhang J.-H. Li B.-Q. Fu Q.-S. Kalimuldina G. Sun G.-Z. Han Y. Kong L.
June 2024Elsevier B.V.
Journal of Energy Chemistry
2024#93663 - 668 pp.
Expediting redox kinetics of sulfur species on conductive scaffolds with limited charge accessible surface is considered as an imperative approach to realize energy-dense and power-intensive lithium-sulfur (Li–S) batteries. In this work, the concept of concurrent hetero-/homo-geneous electrocatalysts is proposed to simultaneously mediate liquid–solid conversion of lithium polysulfides (LiPSs) and solid lithium disulfide/sulfide (Li2S2/Li2S) propagation, the latter of which suffers from sluggish reduction kinetics due to buried conductive scaffold surface by extensive deposition of Li2S2/Li2S. The selected model material to verify this concept is a two-in-one catalyst: carbon nanotube (CNT) scaffold supported iron-cobalt (Fe-Co) alloy nanoparticles and partially carbonized selenium (C-Se) component. The Fe-Co alloy serves as a heterogeneous electrocatalyst to seed Li2S2/Li2S through sulphifilic active sites, while the C-Se sustainably releases soluble lithium polyselenides and functions as a homogeneous electrocatalyst to propagate Li2S2/Li2S via solution pathways. Such bi-phasic mediation of the sulfur species benefits reduction kinetics of LiPS conversion, especially for the massive Li2S2/Li2S growth scenario by affording an additional solution directed route in case of conductive surface being largely buried. This strategy endows the Li–S batteries with improved cycling stability (836 mA h g−1 after 180 cycles), rate capability (547 mA h g−1 at 4 C) and high sulfur loading superiority (2.96 mA h cm−2 at 2.4 mg cm−2). This work hopes to enlighten the employment of bi-phasic electrocatalysts to dictate liquid–solid transformation of intermediates for conversion chemistry batteries.
Electrocatalysis , Energy density , Lithium polysulfides , Lithium-sulfur batteries , Sulfur cathode
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Xian Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Shaanxi, Xian, 710129, China
Institute of Advanced Materials, Nanjing Tech University, Jiangsu, Nanjing, 211816, China
Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, China
Department of Mechanical and Aerospace Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Kabanbay Batyr Ave. 53, Astana, 010000, Kazakhstan
Xian Institute of Flexible Electronics (IFE)
Institute of Advanced Materials
Advanced Research Institute of Multidisciplinary Science
Department of Mechanical and Aerospace Engineering
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