首页|Concurrent hetero-/homo-geneous electrocatalysts to bi-phasically mediate sulfur species for lithium-sulfur batteries

Concurrent hetero-/homo-geneous electrocatalysts to bi-phasically mediate sulfur species for lithium-sulfur batteries

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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 pro-posed 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.

Lithium-sulfur batteriesElectrocatalysisLithium polysulfidesSulfur cathodeEnergy density

Rui-Bo LingHu、Jin-Xiu Chen、Jin-Hao Zhang、Bo-Quan Li、Qing-Shan Fu、Gulnur Kalimuldina、Geng-Zhi Sun、Yunhu Han、Long Kong

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Xi'an Institute of Flexible Electronics(IFE),Northwestern Polytechnical University,Xi'an 710129,Shaanxi,China

Institute of Advanced Materials,Nanjing Tech University,Nanjing 211816,Jiangsu,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

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National Natural Science Foundation of ChinaShenzhen Foundation Research ProgramFundamental Research Funds for the Central UniversitiesZhejiang Province Key Laboratory of Flexible Electronics Open Fund

22379121JCYJ20220530112812028G2022KY06062023FE005

2024

10.1016/j.jechem.2024.01.072

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
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