A silk sericin-confined in-situ synthesis strategy: Fe7S8 inserted N,S co-doped carbon nano-aggregates for high-performance sodium storage
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NSTL
Elsevier
? 2022 Elsevier B.V.Owing to the low cost and renewability, biomass-derived hard carbons (B-HCs) are attractive anode candidates for sodium-ion batteries (SIBs). Although the specific capacity of B-HCs can be further improved by incorporating transition metal sulfides, it also brings out other issues, including the sluggish kinetics, “shuttle effect” of sodium polysulfides and voltage failure. Herein, a facile in-situ synthesis strategy for Fe7S8 inserted N,S co-doped carbon nano-aggregates (Fe7S8-NS/C) is developed. The strong adsorption of sericin to Fe3+ ensures the dispersive distribution of Fe7S8 nanoparticles in carbon matrix, contributing to fast Na+ transport kinetics. The first principles calculations demonstrate the self-doped pyridine N (3.45 at%) and pyrrolic N (7.91 at%) is conducive to Na adsorption, which promotes sodium storage. More importantly, the polar C-S and C-N bonds in the carbon matrix can effectively immobilize sodium polysulfides and inhibit abnormal voltage failure. As an anode material for SIBs, the elaborate Fe7S8-NS/C composite offers high reversible capacity (477 mAh g?1 at 1 A g?1 over 500 cycles) and excellent rate capability (326 mAh g?1 at 5 A g?1). The simple synthesis method and outstanding electrochemical performances make the Fe7S8-NS/C an attractive candidate for SIBs.
Fan R.、He T.、Ma J.、Fang S.、Jin D.、Gao J.、Cai Y.、Zhao C.
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The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education National Engineering Lab for Textile Fiber Materials and Processing Technology School of Materials Science and Engineering Zhejiang Sci-Tech University
NSTL
Elsevier
