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Ultrafine FeS2 nanocrystals/porous nitrogen-doped carbon hybrid nanospheres encapsulated in three-dimensional graphene for simultaneous efficient lithium and sodium ion storage

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Abstract

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.

Graphical abstract: Ultrafine FeS2 nanocrystals/porous nitrogen-doped carbon hybrid nanospheres encapsulated in three-dimensional graphene for simultaneous efficient lithium and sodium ion storage

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Publication details

The article was received on 16 Sep 2019, accepted on 30 Oct 2019 and first published on 30 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA10184E
J. Mater. Chem. A, 2019, Advance Article

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    Ultrafine FeS2 nanocrystals/porous nitrogen-doped carbon hybrid nanospheres encapsulated in three-dimensional graphene for simultaneous efficient lithium and sodium ion storage

    Z. Chen, S. Li, Y. Zhao, M. F. Aly Aboud, I. Shakir and Y. Xu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA10184E

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