Synthesis and microstructure of the (Co,Cr,Fe,Mn,Ni) 3 O 4  high entropy oxide characterized by spinel structure

Dąbrowa, Juliusz; Stygar, Mirosław; Mikuła, Andrzej; Knapik, A.; Mroczka, K.; Tejchman, Waldemar; Danielewski, Marek; Martin, Manfred

doi:10.1016/j.matlet.2017.12.148

Cited by 409 publications

(252 citation statements)

References 19 publications

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“…Rechargeable lithium‐ion batteries (LIBs) are the most widely used electrochemical energy storage devices. They combine stable capacity retention with good energy density and efficiency, making them first choice for a variety of applications, such as in electric vehicles . Nevertheless, especially energy‐demanding applications necessitate the development of new low‐voltage anode and high‐voltage cathode materials with improved specific capacities (where energy storage is based on some form of battery storage, such as insertion, conversion or alloying reactions) .…”

Section: Introductionmentioning

confidence: 99%

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

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Tripković

et al. 2020

Batteries & Supercaps

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Multicomponent materials may exhibit favorable Li‐storage properties because of entropy stabilization. While the first examples of high‐entropy oxides and oxyfluorides show good cycling performance, they suffer from various problems. Here, we report on side reactions leading to gas evolution in Li‐ion cells using rock‐salt (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O (HEO) or Li(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)OF (Li(HEO)F). Differential electrochemical mass spectrometry indicates that a robust solid‐electrolyte interphase layer is formed on the HEO anode, even when using an additive‐free electrolyte. For the Li(HEO)F cathode, the cumulative amount of gases is found by pressure measurements to depend strongly on the upper cutoff potential used during cycling. Cells charged to 5.0 V versus Li+/Li show the evolution of O2, H2, CO2, CO and POF3, with the latter species being indirectly due to lattice O2 release as confirmed by electron energy loss spectroscopy. This result attests to the negative effect that lattice instability at high potentials has on the gassing.

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Section: Introductionmentioning

confidence: 99%

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Breitung

Schiele

Tripković

et al. 2020

Batteries & Supercaps

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“…To the best of our knowledge, all of the previously reported single‐phase high‐entropy oxide ceramics synthesized using conventional solid‐state reaction were subjected to fast cooling, such as air quenching or rapid cooling by turning off the furnace, which is common for high‐entropy materials in order to preserve the entropy‐stabilized phases that are favorably formed at high temperatures …”

Section: Introductionmentioning

confidence: 99%

Solid‐state synthesis of multicomponent equiatomic rare‐earth oxides

et al. 2020

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Phase formation in multicomponent rare-earth oxides is determined by a combination of composition, sintering atmosphere, and cooling rate. Polycrystalline ceramics comprising various combinations of Ce, Gd, La, Nd, Pr, Sm, and Y oxides in equiatomic proportions were synthesized using solid-state sintering. The effects of composition, sintering atmosphere, and cooling rate on phase formation were investigated. Single cubic or monoclinic structures were obtained with a slow cooling of 3.3°C/min, confirming that rare-earth oxides follow a different structure stabilization process than transition metal high-entropy oxides. In an oxidizing atmosphere, both Ce and Pr induce a cubic structure, while only Ce plays that role in an inert or reducing atmosphere. Samples without Ce or Pr develop a single monoclinic structure. The structures formed at initial synthesis may be converted to a different one, when the ceramics are annealed in an additional atmosphere. Phase evolution of a five-cation composition was also studied as a function of sintering temperature. The binary oxides used as raw materials completely dissolve into a single cubic structure at 1450°C in air. K E Y W O R D S phase transformations, rare earths, reaction sintering How to cite this article: Pianassola M, Loveday M, McMurray JW, Koschan M, Melcher CL, Zhuravleva M. Solid-state synthesis of multicomponent equiatomic rare-earth oxides. J Am Ceram Soc.

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“…For instance, several single‐phase multicomponent metal diborides and metal carbide systems were synthesized, the synthesized ceramic structures had ultra‐high temperature properties coupled with low values of thermal conductivity . The concept of entropy stabilization was further used to synthesize more complex spinel, perovskite and fluorite crystal structures . The transition metal ion stabilized rock salt structure ([MgNiCoCuZn]O) is of particular interest because of the high potential exhibited by this material system for various properties …”

Section: Introductionmentioning

confidence: 99%

Critical role of cationic local stresses on the stabilization of entropy‐stabilized transition metal oxides

2020

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Entropy‐stabilized transition metal oxides ([MgNiCoCuZn]O) (ESO) in recent years have received considerable attention owing to their unique functional properties. Solution combustion and solid state syntheses resulted in crystallites varying from 5‐15 nm to 3‐5 μm respectively. Phase stability studies showed that all the systems containing Cu2+ ions in the ESO lattice segregated upon slow cooling in the furnace. It was only when ESO was quenched in air from 1000°C the lattice stabilized to a single phase. Experiments concomitant with molecular dynamics (MD) simulations demonstrated that the local stress fields around the cations played a critical role in stabilizing the single phase. The local stress fields are a result of Jahn‐Teller distortion induced by the Cu2+ ions in the lattice. It is clearly established that in the absence of the minimization of the local stress fields around the Cu2+ ions, segregation leading to the formation of a multi‐phase material is imminent for this particular composition.

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Synthesis and microstructure of the (Co,Cr,Fe,Mn,Ni) 3 O 4 high entropy oxide characterized by spinel structure

Cited by 409 publications

References 19 publications

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Gassing Behavior of High‐Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Solid‐state synthesis of multicomponent equiatomic rare‐earth oxides

Critical role of cationic local stresses on the stabilization of entropy‐stabilized transition metal oxides

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