Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Institute of Marine Biobased Materials, College of Environmental Science and Engineering , Qingdao University , Qingdao 266071 , P. R. China.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry , Chinese Academy of Sciences , Taiyuan 030001 , P. R. China.
ACS Appl Mater Interfaces. 2018 May 23;10(20):17175-17182. doi: 10.1021/acsami.8b03059. Epub 2018 May 8.
The nanostructured metal sulfides have been reported as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacities but have suffered from the unsatisfactory electronic conductivity and poor structural stability during a charge/discharge process, thus limiting their applications. Herein, the one-dimensional (1D) porous FeS/carbon fibers (FeS/CFs) micro/nanostructures are fabricated through facile pyrolysis of double-helix-structured Fe-carrageenan fibers. The FeS nanoparticles are in situ formed by interacting with sulfur-containing group of natural material ι-carrageenan and uniformly embedded in the unique 1D porous carbon fibrous matrix, significantly enhancing the sodium-ion storage performance. The obtained FeS/CFs with optimized sodium storage performance benefits from the appropriate carbon content (20.9 wt %). The composite exhibits high capacity and excellent cycling stability (283 mAh g at current density of 1 A g after 400 cycles) and rate performance (247 mAh g at 5 A g). This work provides a simple strategy to construct 1D porous FeS/CFs micro/nanostructures as high-performance anode materials for SIBs via a unique sustainable and environmentally friendly way.
纳米结构金属硫化物由于其高理论容量而被报道为钠离子电池（SIBs）的有前途的阳极材料，但在充电/放电过程中存在电子导电性差和结构稳定性差的问题，从而限制了其应用。在此，通过双螺旋结构的 Fe-卡拉胶纤维的简单热解制备了一维（1D）多孔 FeS/碳纤维（FeS/CFs）微/纳米结构。FeS 纳米颗粒通过与天然物质 ι-卡拉胶的含硫基团相互作用原位形成，并均匀嵌入独特的 1D 多孔碳纤维基质中，显著提高了钠离子存储性能。具有优化钠离子存储性能的所得 FeS/CFs 得益于适当的碳含量（20.9wt%）。该复合材料表现出高容量和优异的循环稳定性（400 次循环后在 1Ag 的电流密度下为 283mAhg）和倍率性能（在 5Ag 时为 247mAhg）。这项工作提供了一种通过独特的可持续和环保方式构建 1D 多孔 FeS/CFs 微/纳米结构作为高性能 SIBs 阳极材料的简单策略。
