Nano-sized FeSe2 anchored on reduced graphene oxide as a promising anode material for lithium-ion and sodium-ion batteries

Kong, Fanjun; Lv, Linze; Gu, Ying; Tao, Shi; Jiang, Xuefan; Qian, Bin; Gao, Lei

doi:10.1007/s10853-018-3143-1

Cited by 86 publications

(34 citation statements)

References 39 publications

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“…The phase and crystal structure of FeSe 2 /C and FeSe 2 /C@NGS were characterized by XRD and shown in Figure (a). The diffraction peaks of FeSe 2 /C and FeSe 2 /C@NGS perfectly match with the standard data of FeSe 2 (JCPDS: 65‐2570) with orthorhombic structure . The broad diffraction peak at low degree of FeSe 2 /C@NGS is ascribed to the structure of N‐doping graphene sheets (NGS).…”

Section: Resultssupporting

confidence: 73%

“…While FeSe 2 /C@NGS presents excellent cycling stability with a reversible specific capacity of 757.0 mAh g −1 . The capacity fluctuation of FeSe 2 /C@NGS in the discharge/charge process may be attributed to that kinetically activated electrolyte degradation leads to the reversible growth of a polymeric gel‐like film, and this phenomenon is observed in some iron‐based anode material …”

Section: Resultsmentioning

confidence: 99%

“…The diffraction peaks of FeSe 2 /C and FeSe 2 /C@NGS perfectly match with the standard data of FeSe 2 (JCPDS: 65-2570) with orthorhombic structure. [47] The broad diffraction peak at low degree of FeSe 2 /C@NGS is ascribed to the structure of N-doping graphene sheets (NGS). Figure 1 [48] Compared to FeSe 2 /C, the weight increase at lower temperature for FeSe 2 /C@NGS is ascribed to the partial metal iron in the composite under the reduction of NGS with heat treat.…”

Section: Resultsmentioning

confidence: 99%

“…The capacity fluctuation of FeSe 2 / C@NGS in the discharge/charge process may be attributed to that kinetically activated electrolyte degradation leads to the reversible growth of a polymeric gel-like film, and this phenomenon is observed in some iron-based anode material. [47,58,59] Besides, the rate capability of FeSe 2 /C and FeSe 2 /C@NGS was also characterized and presented in Figure 4 (c). The FeSe 2 / C@NGS displays higher capacities than FeSe 2 /C at various current densities from 0.1 to 5.0 A g À 1 .…”

Section: Resultsmentioning

confidence: 99%

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Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

et al. 2019

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Metal selenides have been widely studied as anodes for lithium‐ion batteries, owing to the excellent electrochemical performance. However, the large volume change and poor conductivity may lead to unsatisfactory cycling stability and rate capability. Herein, the FeSe2/carbon matrix nanoparticles embedded into N‐doped graphene sheets (NGS) are designed and synthesized through a two‐step method. When employed as anodes for lithium‐ion batteries, the FeSe2/C@NGS composites exhibit high reversible specific capacities and excellent cycling stabilities of 757.0 mAh g−1 after 100 cycles at 100 mA g−1 and 593.8 mAh g−1 after 1000 cycles at 2000 mA g−1. The carbon matrix and NGS construct binary conductive networks, which not only improve the inner conductivity of FeSe2 and conductivity between FeSe2/C nanoparticles, but also provide elastic buffer space to sustain the structural strain and accommodate the volume expansion and contraction of electrodes during the discharge and charge process. Furthermore, the reversible redox reaction of FeSe2 involves the formation of Fe and Li2Se during the cycling process. This work may open a new avenue for electrode material synthesis methodologies using metal‐organic frameworks as a template and to explore the lithium storage mechanisms of metal selenides for next‐generation batteries.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

et al. 2019

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“…However, the high cost of cobalt sources limits its further application [21][22][23] . For FeSe2, a reversible capacity of 372 mA•h/g over 2000 cycles at 1000 mA/g is obtained [24,25] . Compared with cobalt selenide, iron selenide is cheaper, and the electrochemical stability is better [26] .…”

Section: Introductionmentioning

confidence: 99%

Hexagonal FeNi2Se4@C Nanoflakes as High Performance Anode Materials for Sodium-ion Batteries

Qiu

Bao

et al. 2021

Chem. Res. Chin. Univ.

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etal selenides have drawn significant attention as promising anode materials for sodium-ion batteries(SIBs) owing to their high electronic conductivity and reversible capacity. Herein, hexagonal FeNi 2 Se 4 @C nanoflakes were synthesized via a facile one-step hydrothermal method. They deliver a reversible capacity of 480.7 mA•h/g at 500 mA/g and a high initial Coulombic efficiency of 87.8 %. Furthermore, a discharge capacity of 444.8 mA•h/g can be achieved at 1000 mA/g after 180 cycles. The sodium storage mechanism of FeNi 2 Se 4 @C is uncovered. In the discharge process, Fe and Ni nanoparticles are generated and distributed in Na 2 Se matrix homogeneously. In the charge process, FeNi 2 Se 4 phase is formed reversibly. The reversible phase conversion of FeNi 2 Se 4 @C during cycling is responsible for the excellent electrochemical performance and enables FeNi 2 Se 4 @C nanoflakes promising anode materials for SIBs.

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Revealing the Valence Evolution of Metal Element in Heterostructures for Ultra‐High Power Li‐Ion Capacitors

Tao

Cai

Cao

et al. 2023

Advanced Energy Materials

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The difficulty in matching cathode and anode kinetics due to slow ion transport in anodes constrains the development of lithium‐ion capacitors. Heterogeneous structures with built‐in electric field can promote lithium‐ion migration and improve the anode reaction kinetics. However, the valence evolution of metal elements in heterostructures during charging/discharging processes is often overlooked. Inspired by theoretical calculations, transition metal selenides heterostructures (FeSe2/CoSe2) with low migration energy barriers (E b = 0.35 eV) are successfully engineered and fabricated. As expected, the designed heterostructure material exhibits outstanding rate performance (512 mAh g−1 at 30 A g−1) and ultra‐high pseudocapacitance contribution (98.02% at 1.0 mV s−1), exceeding the state‐of‐the‐art values for anodes. Impressively, synchrotron X‐ray absorption spectroscopy (SXAS) and ex situ XPS find that the valence states of the Fe and Co elements in the heterogeneous structure gradually increase as charging and discharging proceeds, inducing a continuous climb in reversible specific capacity, while further reducing the migration energy barrier in the heterogeneous structure (E b = 0.20 eV). This work reveals that the valence states of iron and cobalt elements increase as charging and discharging proceeds, providing theoretical guidance for improving the anode kinetics and revealing the capacity rise mechanism of other transition metal compounds.

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Nano-sized FeSe2 anchored on reduced graphene oxide as a promising anode material for lithium-ion and sodium-ion batteries

Cited by 86 publications

References 39 publications

Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

Hexagonal FeNi2Se4@C Nanoflakes as High Performance Anode Materials for Sodium-ion Batteries

Revealing the Valence Evolution of Metal Element in Heterostructures for Ultra‐High Power Li‐Ion Capacitors

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Nano-sized FeSe2 anchored on reduced graphene oxide as a promising anode material for lithium-ion and sodium-ion batteries

Cited by 86 publications

References 39 publications

Metal‐Organic‐Framework‐Derived FeSe2@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

Metal‐Organic‐Framework‐Derived FeSe2@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

Hexagonal FeNi2Se4@C Nanoflakes as High Performance Anode Materials for Sodium-ion Batteries

Revealing the Valence Evolution of Metal Element in Heterostructures for Ultra‐High Power Li‐Ion Capacitors

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Product

Resources

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Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

Metal‐Organic‐Framework‐Derived FeSe₂@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries