Iron Selenide Microcapsules as Universal Conversion‐Typed Anodes for Alkali Metal‐Ion Batteries

Lu, Shiyao; H, Wu; Xu, Siyuan; Wang, Yuankun; Zhao, Jianyun; Li, Yuhan; Abdelkader, Amr M.; Li, Jiao; Wang, Wei; Xi, Kai; Guo, Yuzheng; Gao, Guoxin; Kumar, R. Vasant

doi:10.1002/smll.202005745

Cited by 77 publications

(44 citation statements)

References 65 publications

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“…[52] In Se3d spectra (Figure 6f), new peaks at 52.5 eV (Se 3d5/2) and 53.4 eV (Se 3d3/2) are deconvolved when discharged to 0.01 V, which corresponds to the formation of potassium-selenium compound. And the peaks at 53.9 (Se 3d5/2) and 54.8 (Se 3d3/2) for Fe-Se reappear after full discharge to 3.0 V. [16] The electrochemical conversion mechanism can be described by the following equations:…”

Section: Resultsmentioning

confidence: 99%

“…[12][13][14][15] Iron selenides, as one typical metal selenide, have metallic properties as well as flexible valence states, which have been extensively investigated as anode materials for K + /Na + storage. [16,17] They still suffer from, however, volume expansion and poor conductivity, which lead to structural instability of the electrode and further result in poor cycling performance upon repeated insertion and extraction of K + /Na + ions. [18,19] Thus, numerous strategies have been proposed.…”

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confidence: 99%

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Iron Selenide‐Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium‐Ion Storage

Kong

Wang

Iqbal

et al. 2022

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202107252. Suitable anode materials with high capacityand long cycling stability, especially capability at high current densities, are urgently needed to advance the development of potassium ion batteries (PIBs) and sodium ion batteries (SIBs). Herein, a porous Ni-doped FeSe 2 /Fe 3 Se 4 heterojunction encapsulated in Se-doped carbon (NF 11 S/C) is designed through selenization of MOFs precursor. The porous composite possesses enriched active sites and facilitates transport for both ion and electron. Ni-doping is adopted to enrich the lattice defects and active sites. The Se-C bond and carbon framework endow integrity of the composite and hamper aggregation of selenide nano-particles during potassiation/de-potassiation. The NF 11 S/C exhibits exceptional rate performance and ultra-long cycling stability (177.3 mA h g −1 after 3050 cycles at 2 A g −1 for PIBs and 208.8 mA h g −1 after 2000 cycles at 8 A g −1 for SIBs). The potassiation/de-potassiation mechanism is investigated via ex-situ X-ray powder diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectrocopy and Raman analysis. PTCDA//NF 11 S/C full cell stably cycles for 1200 cycles at 200 mA g −1 with a capacity of 103.7 mA h g −1 , indicating the high application potential of the electrode for highly stable rechargeable batteries.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Iron Selenide‐Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium‐Ion Storage

Kong

Wang

Iqbal

et al. 2022

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“…However, the existence of the reaction intermediate K 2 Se 2 is yet to be explained, and further efforts are required to explore its origin. In contrast to the electrochemical reaction mechanism of the insertion of K + into FeSe 2 /NC, a study on a hierarchical hybrid yolk–shell FeSe 2 @C performed by Wu et al reported that elemental selenium was not formed during cycling. They carried out in situ XRD and XPS to monitor the reaction process of K + storage.…”

Section: Battery-type Anode Materialsmentioning

confidence: 98%

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

et al. 2021

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Potassium ion energy storage devices are competitive candidates for grid-scale energy storage applications owing to the abundancy and cost-effectiveness of potassium (K) resources, the low standard redox potential of K/K+, and the high ionic conductivity in K-salt-containing electrolytes. However, the sluggish reaction dynamics and poor structural instability of battery-type anodes caused by the insertion/extraction of large K+ ions inhibit the full potential of K ion energy storage systems. Extensive efforts have been devoted to the exploration of promising anode materials. This Review begins with a brief introduction of the operation principles and performance indicators of typical K ion energy storage systems and significant advances in different types of battery-type anode materials, including intercalation-, mixed surface-capacitive-/intercalation-, conversion-, alloy-, mixed conversion-/alloy-, and organic-type materials. Subsequently, host–guest relationships are discussed in correlation with the electrochemical properties, underlying mechanisms, and critical issues faced by each type of anode material concerning their implementation in K ion energy storage systems. Several promising optimization strategies to improve the K+ storage performance are highlighted. Finally, perspectives on future trends are provided, which are aimed at accelerating the development of K ion energy storage systems.

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“…FeS 2 @NC nanosheets 1 M KFSI in EC/DEC (1/1) 525.5 at 100 A g −1 90% after 100 cycles (0.5 A g −1 ) [111] ZnSe/C 1 M KFSI in EC/DEC (1/1) 318 at 50 mA g −1 92% after 1000 cycles (0.5 A g −1 )…”

Section: Development Of Electrolytes For Graphitementioning

confidence: 99%

Electrolyte formulation strategies for potassium‐based batteries

et al. 2022

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Potassium (K)-based batteries are viewed as the most promising alternatives to lithiumbased batteries, owing to their abundant potassium resource, lower redox potentials (−2.97 V vs. SHE), and low cost. Recently, significant achievements on electrode materials have boosted the development of potassium-based batteries. However, the poor interfacial compatibility between electrode and electrolyte hinders their practical. Hence, rational design of electrolyte/electrode interface by electrolytes is the key to develop K-based batteries. In this review, the principles for formulating organic electrolytes are comprehensively summarized. Then, recent progress of various liquid organic and solidstate K + electrolytes for potassium-ion batteries and beyond are discussed. Finally, we offer the current challenges that need to be addressed for advanced K-based batteries. K E Y WO R D Sfundamentals of organic electrolytes, liquid electrolytes, potassium-based batteries, solid-state electrolytes This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Iron Selenide Microcapsules as Universal Conversion‐Typed Anodes for Alkali Metal‐Ion Batteries

Cited by 77 publications

References 65 publications

Iron Selenide‐Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium‐Ion Storage

Iron Selenide‐Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium‐Ion Storage

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

Electrolyte formulation strategies for potassium‐based batteries

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