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锂硫电池凭借其高的理论能量密度(2600 W·h·kg~(-1))、丰富廉价的材料来源、且对环境友好等优势,而引起了人们的广泛关注.然而,锂硫电池活性物质导电性差、多硫化物易溶于有机电解液等问题所导致的硫正极倍率性能和循环稳定性差,仍然是困扰锂硫电池发展的挑战性难题.我们设计并以廉价易得的小分子化合物对苯二酚和甲醛为原料,通过缩聚反应、与氧化石墨烯原位复合、高温氮化制备了一类新型氮掺杂的碳纳米带固硫载体材料(NCNB-NG).通过NCNB-NG复合纳米硫进一步得到的碳-硫复合正极材料(S@NCNB-NG)表现出更优异的倍率性能和循环稳定性,这主要得益于该碳质载体独特的微结构以及改善的导电性.
Due to its high theoretical energy density (2600 W · h · kg -1), it is widely used in lithium-sulfur batteries because of its advantages of low-cost materials sources and environmental friendliness. However, lithium-sulfur batteries Poor conductivity of active substances, poor solubility of polysulfides in organic electrolyte and other problems caused by the positive rate of sulfur positive cycle and poor cycle stability is still plagued the development of lithium-sulfur battery challenges.We design and easy to get cheap small molecules A new type of nitrogen-doped carbon nanobelts sulfur-fixing carrier material (NCNB-NG) was prepared by polycondensation reaction, in-situ recombination with graphene oxide and high-temperature nitridation.Compared with NCNB- The further carbon-sulfur composite positive electrode material (NCNC-NG) obtained from NG composite nanosulfur showed more excellent rate capability and cycle stability, mainly due to the unique microstructure of the carbonaceous carrier and the improved conductivity .