Loading Fe3O4 nanoparticles on paper-derived carbon scaffold toward advanced lithium-sulfur batteries

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 1-11
• 页数: 11页
• 语种: 英文

摘要

Lithium-sulfur batteries(LSBs)are regarded as a competitive next-generation energy storage device.However,their practical performance is seriously restricted due to the undesired polysulfides shuttling.Herein,a multifunctional interlayer composed of paper-derived carbon(PC)scaffold,Fe3O4 nanoparticles,graphene,and graphite sheets is designed for applications in LSBs.The porous PC skeleton formed by the interweaving long-fibers not only facilitates fast transfer of Li ions and electrons but also provides a phys-ical barrier for the polysulfide shuttling.The secondary Fe3O4@graphene component can reduce the po-larization,boost the attachment of polysulfides,and promote the charging-discharging kinetics.The outer graphitic sheets layers benefit the interfacial electrochemistry and the utilization of S-containing species.The efficient obstruction of polysulfides diffusion is further witnessed via in situ ultraviolet-visible char-acterization and first-principles simulations.When 73％sulfur/commercial acetylene black is used as the cathode,the cell exhibits excellent capacity retention with high capacities at 0.5 C for 1000 cycles and even up to 10 C for 500 cycles,an ultrahigh rate capability up to 10 C(478 mAh g-1),and a high areal-sulfur loading of 8.05 mg cm-2.The strategy paves the way for developing multifunctional composites for LSBs with superior performance.