Rethinking the Design of Ionic Conductors Using Meyer–Neldel–Conductivity Plot

Gao, Yirong; Li, Nana; Wu, Yifan; Yang, Wenge; Bo, Shou‐Hang

doi:10.1002/aenm.202100325

Cited by 27 publications

(34 citation statements)

References 79 publications

(117 reference statements)

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“…The higher the activation enthalpy, the higher the pre-factor, which is affected by entropy contributions, attempt frequencies and, in the case of ionic conductivity, also by the effective number of charge carriers. Recently, a similar trend has also been found for LLZO-type conductors [ 71 ] and other compounds such as thiophosphates [ 31 , 72 ]. The semi-empirical relationship seems to be valid at least for the averaged, macroscopic ion transport.…”

Section: Case Studiessupporting

confidence: 75%

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Gombotz

Hogrefe

Zettl

et al. 2021

Phil. Trans. R. Soc. A.

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Nuclear magnetic resonance offers a wide range of tools to analyse ionic jump processes in crystalline and amorphous solids. Both high-resolution and time-domain 1 , 2 H , 6 , 7 Li , 19 F , 23 Na NMR helps throw light on the origins of rapid self-diffusion in materials being relevant for energy storage. It is well accepted that Li + ions are subjected to extremely slow exchange processes in compounds with strong site preferences. The loss of this site preference may lead to rapid cation diffusion, as is also well known for glassy materials. Further examples that benefit from this effect include, e.g. cation-mixed, high-entropy fluorides ( Ba, Ca) F 2 , Li-bearing garnets ( Li 7 La 3 Zr 2 O 12 ) and thiophosphates such as LiTi 2 ( PS 4 ) 3 . In non-equilibrium phases site disorder, polyhedra distortions, strain and the various types of defects will affect both the activation energy and the corresponding attempt frequencies. Whereas in ( Me, Ca ) F 2 ( Me = Ba , Pb ) cation mixing influences F anion dynamics, in Li 6 PS 5 X ( X = Br , Cl , I ) the potential landscape can be manipulated by anion site disorder. On the other hand, in the mixed conductor Li 4 + x Ti 5 O 12 cation-cation repulsions immediately lead to a boost in Li + diffusivity at the early stages of chemical lithiation. Finally, rapid diffusion is also expected for materials that are able to guide the ions along (macroscopic) pathways with confined (or low-dimensional) dimensions, as is the case in layer-structured RbSn 2 F 5 or MeSnF 4 . Diffusion on fractal systems complements this type of diffusion. This article is part of the Theo Murphy meeting issue ‘Understanding fast-ion conduction in solid electrolytes’.

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Section: Case Studiessupporting

confidence: 75%

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Gombotz

Hogrefe

Zettl

et al. 2021

Phil. Trans. R. Soc. A.

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“…The importance of k B T iso in guiding the search for new ionic conductor materials has been discussed in detail elsewhere. [35]…”

Section: Proton Conductivity In Perovskites: An Investigation According To Mnrmentioning

confidence: 99%

“…Similarly, the pressure-tuning approach has been proved as a rapid method to determine the Meyer-Neldel energy k B T iso for lithium ionic conductors. [35]…”

Section: Correlation Between Isokinetic Temperature Vibrational Frequency and Proton-phonon Couplingmentioning

confidence: 99%

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Ling

et al. 2021

Advanced Energy Materials

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Perovskite‐type metal oxides such as Y‐doped BaMO3 (M = Zr/Ce) have drawn considerable attention as proton‐conducting electrolytes for intermediate temperature ceramic electrochemical cells. Improving the proton conductivity at lower temperatures requires a comprehensive understanding of the proton conduction mechanism. By applying high pressure or varying the Ce content of Y‐doped BaMO3, it is demonstrated that the proton conductivity follows the Meyer–Neldel rule (MNR) well. In the Arrhenius plot, the conductivities intersect at an isokinetic temperature, where the proton conductivity is independent of activation energy. Considering the relationship between isokinetic temperature and lattice vibration frequency, a high isokinetic temperature is observed in materials with stiff lattices, consisting of light atoms and small MO bond length. Based on consideration of the MNR, it is suggested that the enhancement of proton conductivity at low temperature can be well achieved by tuning lattice vibration frequency toward a desired isokinetic temperature.

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“…Based on Eq. 7, Gao et al 59 highlighted that the relationship between  and E a depends on the sign of at a…”

Section: Correlation Between Lattice Dynamics and Ionic Transport: Th...mentioning

confidence: 99%

Understanding the effect of lattice polarisability on the electrochemical properties of lithium tetrahaloaluminates, LiAlX₄ (X = Cl, Br, I)

et al. 2022

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Rethinking the Design of Ionic Conductors Using Meyer–Neldel–Conductivity Plot

Cited by 27 publications

References 79 publications

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Understanding the effect of lattice polarisability on the electrochemical properties of lithium tetrahaloaluminates, LiAlX₄ (X = Cl, Br, I)

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Rethinking the Design of Ionic Conductors Using Meyer–Neldel–Conductivity Plot

Cited by 27 publications

References 79 publications

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Fuzzy logic: about the origins of fast ion dynamics in crystalline solids

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Understanding the effect of lattice polarisability on the electrochemical properties of lithium tetrahaloaluminates, LiAlX4 (X = Cl, Br, I)

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Understanding the effect of lattice polarisability on the electrochemical properties of lithium tetrahaloaluminates, LiAlX₄ (X = Cl, Br, I)