• 文献标题:   Ultrafine FeS2 nanocrystals/porous nitrogen-doped carbon hybrid nanospheres encapsulated in three-dimensional graphene for simultaneous efficient lithium and sodium ion storage
  • 文献类型:   Article
  • 作  者:   CHEN ZH, LI S, ZHAO Y, ALY ABOUD MF, SHAKIR I, XU YX
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Westlake Univ
  • 被引频次:   14
  • DOI:   10.1039/c9ta10184e
  • 出版年:   2019

▎ 摘  要

Exploring advanced electrode materials with simultaneous efficient lithium and sodium ion storage is highly desired but remains a considerable challenge mainly due to the significant difference of lithium and sodium ion sizes. Transition metal sulfides (TMSs) have shown great potential in lithium/sodium ion batteries (LIBs/SIBs), however, they still face the critical issues of poor electrical conductivity, sluggish ion diffusion, huge volume expansion and agglomeration of highly reactive nano-metal products. Herein, we deliberately design a multiple-scale nanostructured and flexible anode by a facile one-step sulfidation strategy, in which ultrafine metal sulfide nanocrystals are isolated and protected by porous nitrogen-doped carbon nanospheres (PNC) and then encapsulated into three-dimensional graphene microsheets (3DG). It can effectively eliminate the above issues of TMSs, which makes them a very promising candidate for both LIBs and SIBs for the first time. Thus, the resultant FeS2/PNC@3DG anode delivers ultrahigh reversible capacities (1208 mA h g(-1) for LIBs and 597 mA h g(-1) for SIBs at 0.2 A g(-1)), excellent rate capabilities (829 mA h g(-1) for LIBs and 316 mA h g(-1) for SIBs at 5 A g(-1)), and superior long-term cycling performance with a capacity retention of 94.2% for LIBs and 85.2% for SIBs, which has rarely been achieved in previously reported various anodes. Moreover, its highly efficient Li+/Na+ storage mechanisms are systematically investigated by reaction kinetics analysis and density functional theory calculations, which further provide important insights into the development of high-performance energy storage materials.