Metal-Coordinated Covalent Organic Frameworks as Advanced Bifunctional Hosts for Both Sulfur Cathodes and Lithium Anodes in Lithium–Sulfur Batteries

The shuttling of polysulfides on the cathode and the uncontrollable growth of lithium dendrites on the anode have restricted the practical application of lithium–sulfur (Li–S) batteries. In this study, a metal-coordinated 3D covalent organic framework (COF) with a homogeneous distribution of nickel–bis(dithiolene) and N-rich triazine centers (namely, NiS4-TAPT) was designed and synthesized, which can serve as bifunctional hosts for both sulfur cathodes and lithium anodes in Li–S batteries. The abundant Ni centers and N-sites in NiS4-TAPT can greatly enhance the adsorption and conversion of the polysulfides. Meanwhile, the presence of Ni–bis(dithiolene) centers enables uniform Li nucleation at the Li anode,…

• NN
  National Natural Science Foundation of China

  Awards: 22271141, 22022505, 21872069, 22275084
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20220765
• FR
  Fundamental Research Funds for the Central Universities

  Awards: 020514380272, 020514380274, 020514380266