首页|Carbon dots-derived three-dimensional-ordered macroporous host with high penetrability and catalytic activity for LSBs under lean electrolyte
Carbon dots-derived three-dimensional-ordered macroporous host with high penetrability and catalytic activity for LSBs under lean electrolyte
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The practical energy density of lithium-sulfur batteries(LSBs)is seriously limited by the high elec-trolyte-to-sulfur ratios(E/S).The E/S can be reduced by employing hosts with easy-to-infiltrate structure that ensures the uniform distribution of a lean electrolyte and high catalytic activity that can suppress"shuttle effect"via accelerating the slow conversion of soluble polysulfides to insoluble sulfides.Among the easy-to-infiltrate structures,the three-dimensional-ordered macroporous(3DOM)structure is easier to scale preparation and more suitable for the existing industrial processes.However,it is difficult to obtain the 3 DOM with(1)high penetrability due to the high viscosity of frequently-used organic polymer precursors and(2)high catalytic activity due to the low confinement effect,meaning that uniformly dispersed small-sized catalytic materials are difficult to load on 3DOM.Herein,using carbon dots(CDs)with both organic and inorganic properties as a precursor and aggregation limiting agent,a 3DOM host with high penetrability and homodispersed Ni particles of small sizes(Ni-CDs-3DOM)was synthesized.In this host:(1)CDs precursor with suitable viscosity can improve the penetrability.(2)CDs can effectively inhibit the agglomeration of Ni particles.(3)Uniformly dispersed small-size Ni particles offer high-efficiency catalytic activity toward sulfur reactions.Con-sequently,the Ni-CDs-3DOM/sulfur cathode exhibits high sulfur utilization and stable cycling performance even under high sulfur loading(5.5 mg·cm-2)and low E/S(6.5 μl·mg-1).This work indicates the usefulness of CDs in constructing hosts for LSBs with high energy density.
Jiao-Zi Duan、Hua-Yu Pei、Quan Yang、Xue Li、Xin Ba、Xue Yong、Jun-Ling Guo、Si-Yu Lu
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Green Catalysis Center,College of Chemistry,Zhengzhou University,Zhengzhou 450001,China
Country State Center for International Cooperation On Designer Low-Carbon & Environmental Materials,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China
Hubei Institute of Quality Supervision Inspection,Wuhan 430061,China
Department of Chemistry,University of Sheffield,Sheffield S37HF,UK
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国家自然科学基金国家自然科学基金Fellowship of China Postdoctoral Science FoundationFellowship of China Postdoctoral Science Foundation
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