Performance of Pyrrole-Based Triazine Polymer Frameworks for Solid-Phase Conversion Sulfur Polymer Cathodes
Aiming at the serious shuttle effect of lithium-sulfur batteries,solid-phase conversion of sulfur can effectively eliminate the dissolution and diffusion of lithium polysulfide in the liquid phase.Conventional chain polymers represented by polyacrylonitrile can realize solid-phase conversion by covalently combining short-chain sulfur chemically,yet they are often limited by low sulfur contents and poor rate performance.Herein,a higher sulfur content of 47%can be achieved by constructing a pyrrole-based triazine polymer framework(P-CNPy)through the polymerization of cyanotrimerization and pyrrole radicals.The electrochemical testing results show that the sulfur-polymer cathode possesses excellent cycling stability and rate performance,with an average capacity decay of only 0.03%during 500 cycles at 0.2 C,and a reversible capacity of 580 mA∙h/g at 4 C.This method provides a guidance for the design and application of high-performance two-dimensional framework-based sulfur polymer cathodes.
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