Publisher's Note: Effect of magnesium doping on the orbital and magnetic order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>LiNiO</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>[Phys. Rev. B<b>78</b>, 104409 (2008)]

Bonda, M.; Holzapfel, Michael; Brion, S. de; Darie, Céline; Fehér, Titusz; Baker, Peter J.; Lancaster, Tom; Blundell, S. J.; Pratt, F. L.

doi:10.1103/physrevb.78.109903

Cited by 10 publications

(7 citation statements)

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“…The doping of LNO with Mg 2+ is peculiar. As a consequence of steric effects, Mg is preferentially placed in the larger interslab space . For low doping amounts of y <0.1, only Mg is found on the Li site, so no Ni off‐stoichiometry is present (but the presence of Mg 2+ still results in charge‐compensating Ni 2+ in the slab, according to [Li 1− y Mg y ][Ni III 1− y Ni II y ]O 2 ).…”

Section: Elemental Substitution/dopingmentioning

confidence: 99%

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

et al. 2019

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This Review provides a comprehensive overview of LiNiO2 (LNO), almost 30 years after its introduction as a cathode active material. We aim to highlight the physicochemical peculiarities that make LNO a complex material in every aspect. We specifically stress the effect of the Li off‐stoichiometry (Li1−zNi1+zO2) on every property of LNO, especially the electrochemical ones. The key instability issues that plague the compound and the strategies that have been implemented so far to overcome them are discussed in detail. Finally, the open questions that remain to be addressed by the scientific community are summarized, and the research directions that seem the most promising to enable LNO to be fully exploited are elucidated.

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Section: Elemental Substitution/dopingmentioning

confidence: 99%

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

et al. 2019

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“…Die Dotierung von LNO mit Mg 2+ ist eigentümlich. Aufgrund von sterischen Effekten befindet sich Mg bevorzugt in der größeren Zwischenschicht . Für geringe Dotierungsanteile y <0.1 wird Mg nur auf Li‐Positionen beobachtet, sodass keine Ni‐Nichtstöchiometrie vorhanden ist (aber das Vorhandensein von Mg 2+ führt gemäß [Li 1− y Mg y ][Ni III 1− y Ni II y ]O 2 immer noch zu einer Ladungskompensation von Ni 2+ in den Schichten).…”

Section: Elementsubstitution Und Dotierungunclassified

Hin und zurück – die Entwicklung von LiNiO₂ als Kathodenaktivmaterial

et al. 2019

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Wir geben in diesem Aufsatz einen umfassenden Überblick über LiNiO2 (LNO), fast 30 Jahre nach seiner ursprünglichen Einführung als Kathodenaktivmaterial. Ziel ist es, diejenigen physikalisch‐chemischen Eigenschaften hervorzuheben, die LNO in jeder Hinsicht zu einem komplexen Material machen. Der Effekt der Lithium‐Nichtstöchiometrie (Li1−zNi1+zO2) spielt hierbei eine wichtige Rolle. Sie beeinflusst jede Eigenschaft von LNO, besonders das elektrochemische Verhalten. Die wichtigsten Instabilitätsprobleme, die das Material beeinträchtigen, und die Strategien, die bislang implementiert wurden, um diese Probleme zu lösen, werden im Detail diskutiert. Schließlich werden die wichtigsten offenen Fragen, die vor einer nachhaltigen Nutzung von LNO noch zu klären sind, zusammengefasst, und es wird erläutert, welche Forschungsrichtungen vielversprechend sind, um das volle Potential von LNO zu nutzen.

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“…However, if we may bring down the orbital energy to the same scale, it might lead to a novel "spin-orbital liquid" state. While some candidates have been proposed through extensive experimental and theoretical studies [5][6][7], they were later found out to have orbital freezing at low temperature (T s ) [8][9][10]. Thus, an experimental realization of such spin-orbital liquid has remained challenge.…”

mentioning

confidence: 99%

Absence of Jahn−Teller transition in the hexagonal Ba ₃ CuSb ₂ O ₉ single crystal

Katayama

Kimura

Han

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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With decreasing temperature, liquids generally freeze into a solid state, losing entropy in the process. However, exceptions to this trend exist, such as quantum liquids, which may remain unfrozen down to absolute zero owing to strong quantum entanglement effects that stabilize a disordered state with zero entropy. Examples of such liquids include Bose−Einstein condensation of cold atoms, superconductivity, quantum Hall state of electron systems, and quantum spin liquid state in the frustrated magnets. Moreover, recent studies have clarified the possibility of another exotic quantum liquid state based on the spin-orbital entanglement in FeSc 2 S 4 . To confirm this exotic ground state, experiments based on single-crystalline samples are essential. However, no such single-crystal study has been reported to date. Here, we report, to our knowledge, the first single-crystal study on the spin-orbital liquid candidate, 6H-Ba 3 CuSb 2 O 9 , and we have confirmed the absence of an orbital frozen state. In strongly correlated electron systems, orbital ordering usually appears at high temperatures in a process accompanied by a lattice deformation, called a static Jahn−Teller distortion. By combining synchrotron X-ray diffraction, electron spin resonance, Raman spectroscopy, and ultrasound measurements, we find that the static Jahn−Teller distortion is absent in the present material, which indicates that orbital ordering is suppressed down to the lowest temperatures measured. We discuss how such an unusual feature is realized with the help of spin degree of freedom, leading to a spin-orbital entangled quantum liquid state.Q uantum spin liquids have been widely recognized as a new state of matter, as an increasing number of candidates with quantum spin S = 1/2 have been found recently (1-4), a long time after the first proposal was made for the resonating valence-bond state (5). On the other hand, quantum liquids based on another electronic degree of freedom, orbital, have been theoretically proposed (6). However, this type of liquid state has never been experimentally confirmed because the energy of orbital correlation is normally one order of magnitude stronger than spin exchange coupling, leading to an orbital ordering at a significantly high temperature accompanied by a cooperative Jahn-Teller (JT) distortion. Nevertheless, if we can bring down the orbital energy to the same scale as for the spin coupling, it may lead to a novel spin-orbital entangled state, a "quantum spin-orbital liquid." A possible spin-orbital entangled liquid state with dimer correlations has been theoretically discussed on a triangular lattice with singly occupied but triply degenerate t 2g orbitals (7). In comparison with the t 2g orbitals' case, the experimental realization of such a quantum spin-orbital liquid state in the e g orbital system has been even more challenging (8), because e g orbitals more strongly couple to the JT modes.Perovskite-type 6H-Ba 3 CuSb 2 O 9 is a good candidate material for the spin-orbital liquid state that has been ...

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Publisher's Note: Effect of magnesium doping on the orbital and magnetic order inLiNiO2[Phys. Rev. B78, 104409 (2008)]

Cited by 10 publications

References 0 publications

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

Hin und zurück – die Entwicklung von LiNiO₂ als Kathodenaktivmaterial

Absence of Jahn−Teller transition in the hexagonal Ba ₃ CuSb ₂ O ₉ single crystal

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Publisher's Note: Effect of magnesium doping on the orbital and magnetic order inLiNiO2[Phys. Rev. B78, 104409 (2008)]

Cited by 10 publications

References 0 publications

There and Back Again—The Journey of LiNiO2 as a Cathode Active Material

There and Back Again—The Journey of LiNiO2 as a Cathode Active Material

Hin und zurück – die Entwicklung von LiNiO2 als Kathodenaktivmaterial

Absence of Jahn−Teller transition in the hexagonal Ba 3 CuSb 2 O 9 single crystal

Contact Info

Product

Resources

About

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

There and Back Again—The Journey of LiNiO₂ as a Cathode Active Material

Hin und zurück – die Entwicklung von LiNiO₂ als Kathodenaktivmaterial

Absence of Jahn−Teller transition in the hexagonal Ba ₃ CuSb ₂ O ₉ single crystal