Design and Synthesis of Multi-Functional Polymeric Binders for High-Performance Lithium-Sulfur Batteries Based on Ring Opening Polymerization of Thiolactone

The application of high-performance lithium-sulfur(Li-S)batteries is severely influenced by the“shuttle effect”of polysulfides and the volume change of sulfur cathode.Herein,two different polymeric binders SOT-A and SOT-C with three-dimensional network structure containing polar groups(sulfhydryl groups,amide groups and amino groups)are synthesized by the nucleophilic ring-opening polymerization(ROP)of thiolactone with amino groups.The network structure formed by hydrogen bonds and functional groups can resist the volume change of the cathode.The sulfhydryl groups and the S-S bond formed by oxidative dehydrogenation of sulfhydryl group participate in the charge and discharge process of the battery as active materials,which improves the discharge specific capacity of the battery.Polar functional groups have strong chemisorption on polysulfides and effectively inhibit the“shuttle effect”.The electrochemical performances of Li-S batteries containing SOT-A and SOT-C binders are significantly enhanced.At 1 C rate,the batteries achieve initial discharge specific capacity of 871 and 837 mAh·g^(-1),respectively,and have 83.9%and 62.5%capacity retention after 500 cycles.

富氮唑类金属配合物的设计合成及应用

含能材料是一种特殊的能源材料,在国防和民用领域均具有特殊而重要的地位。富氮唑类含能金属配合物及其聚合物是含能材料的一个重要分支,它们在含能材料的起爆药、高能炸药、火箭推进剂和烟花等诸多领域均具有重要的研究价值和广阔的应用前景。本文从咪唑、吡唑、三唑、四唑和五唑等氮唑类含能金属配合物的理论设计、实验合成、性能评估和应用领域等方面近年来的研究进展进行了综述,梳理了用于结构调控、合成优化和性能提升等方面的先进策略,探讨了存在的问题,最后展望了在理论和实验研究上未来的发展方向。