Yolk-Shell Structure and Spin-Polarized Surface Capacitance Enable FeS Stable and Fast Ion Transport in Sodium-Ion Batteries

Han, Meisheng1,2,3; Liu, Jie1,2,3; Deng, Chengfang1,2,3; Guo, Jincong1,2,3; Mu, Yongbiao1,2,3; Zou, Zhiyu1,2,3; Zheng, Kunxiong1,2,3; Yu, Fenghua1,2,3; Li, Qiang4; Wei, Lei1,2,3; Zeng, Lin1,2,3; Zhao, Tianshou1,2,3

2024-06-01

10.1002/aenm.202400246

ADVANCED ENERGY MATERIALS   影响因子和分区

1614-6832

1614-6840

["Iron sulfide (FeS) has been extensively studied as sodium-ion battery anodes due to its high theoretical capacity (609 mAh g-1), but its large volume expansion and low electrical conductivity result in unsatisfactory cycling life and poor rate performance. Moreover, the sodium ion storage mechanism of FeS at a voltage range of 0.01-1 V involving conversion reactions and subsequent ion storage process is unclear yet. Here, the study proposes a vapor-pressure induced synthesis route to fabricate FeS/C yolk-shell structure that ultrathin carbon layers coat on the surface of FeS nanosheets, which can accommodate volume expansion of FeS during sodiation observed via in situ transmission electron microscope and improve its electrical conductivity. Remarkably, an in situ magnetometry reveals that vast spin-polarized electrons can be injected into superparamagnetic Fe nanoparticles (approximate to 3 nm) formed during conversion reaction to induce evolution of electrode magnetization between 0.01 and 1 V, during which spin-polarized surface capacitance effect occurs at Fe/Na2S interfaces to increase extra ion storage and boost ion transport stably. Consequently, the FeS/C yolk-shell nanosheets deliver a high reversible capacity of 664.9 mAh g-1 at 0.1 A g-1, and 300.4 mAh g-1 after 10 000 cycles at 10 A g-1 with a capacity retention of 81.1%.","Here, a FeS/C yolk-shell structure is fabricated to alleviate volume expansion during sodiation and improve electrical conductivity of FeS, thus enhancing cycling and rate performances. Remarkably, in situ magnetometry confirms that superparamagnetic Fe conversion induces evolution of electrode magnetization between 0.01 and 1 V, during which spin-polarized surface capacitance effect occurs to increase extra ion storage and boost ion transport stably. image"]

FeS anode in situ magnetometry magnetization sodium-ion batteries spin-polarized surface capacitance

SCI ; EI

英语

第一 ; 通讯

Major Projects of theNational Natural Science Foundation of China[52293414] ; Research Grants Council of the Hong Kong Special Administrative Region, China[R6005-20] ; null[ZDSYS20220401141000001]

Chemistry ; Energy & Fuels ; Materials Science ; Physics

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001177783500001

WILEY-V C H VERLAG GMBH

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Energy Storage, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, SUSTech Energy Inst Carbon Neutral, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
4.Qingdao Univ, Weihai Innovat Res Inst, Inst Mat Energy & Environm, Coll Phys, Qingdao 266071, Peoples R China

Han, Meisheng,Liu, Jie,Deng, Chengfang,et al. Yolk-Shell Structure and Spin-Polarized Surface Capacitance Enable FeS Stable and Fast Ion Transport in Sodium-Ion Batteries[J]. ADVANCED ENERGY MATERIALS,2024,14(22).

Han, Meisheng.,Liu, Jie.,Deng, Chengfang.,Guo, Jincong.,Mu, Yongbiao.,...&Zhao, Tianshou.(2024).Yolk-Shell Structure and Spin-Polarized Surface Capacitance Enable FeS Stable and Fast Ion Transport in Sodium-Ion Batteries.ADVANCED ENERGY MATERIALS,14(22).

Han, Meisheng,et al."Yolk-Shell Structure and Spin-Polarized Surface Capacitance Enable FeS Stable and Fast Ion Transport in Sodium-Ion Batteries".ADVANCED ENERGY MATERIALS 14.22(2024).