Dielectric relaxation behavior induced by lithium migration in Li4Ti5O12 spinel

Ren, Shaokai; Liu, Jia; Wang, Dawei; Zhang, Jie; Ma, Xing; Knapp, Michael; Liu, Laijun; Ehrenberg, Helmut

doi:10.1016/j.jallcom.2019.04.216

Cited by 33 publications

(16 citation statements)

References 46 publications

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“…The T À1/4 law conrmed the polaron relaxation in NCS samples. 11,39 The quasiparticle (polaron) could move between different vacant sites.…”

Section: Activation Energymentioning

confidence: 99%

“…50 The dielectric relaxations processes suggest that the diffusion pathway of two sodiumions could migrate over the same trajectories. 11 The shi of the relaxation peak corresponds to the relaxation process towards higher frequencies with an increase in temperature which brings out a thermally-activated dielectric relaxation. 51 At any temperature, the frequency u max denes the relaxation time su ¼ 1.…”

Section: Frequency and Temperature Dependence Of The Electric Modulus Formalismsmentioning

confidence: 99%

“…Accordingly, we can notice that the sodium-ion migration and its environment are responsible for the physical proprieties which are signicant for the cathode materials. 11,12 The polymorphism of the cristobalite is porous while the arrangement of the transition metal silicate brings about large tunneling sites that can incorporate the diffusion of the cations. 13,14 Disodium cobalt orthosilicate has attractive properties such as a high structural stability, a high Na + diffusion of 8.0 Â 10 À12 cm 2 s À1 at 300 K (ref.…”

Section: Introductionmentioning

confidence: 99%

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The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

et al. 2020

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“…The T À1/4 law conrmed the polaron relaxation in NCS samples. 11,39 The quasiparticle (polaron) could move between different vacant sites.…”

Section: Activation Energymentioning

confidence: 99%

Section: Frequency and Temperature Dependence Of The Electric Modulus Formalismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

et al. 2020

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“…In contrast to Ren et al . we do only observe two relaxation processes in our LTO sample [25c] . Pang et al .…”

Section: Resultsmentioning

confidence: 41%

“…[23] Simultaneously, to reduce the ion-ion Coulomb interactions, Li ions escape from the originally fully occupied 8a sites and occupy the 16c sites. [9a,13] However, the simultaneous occupation [23] of the neighboring sites 16c and 8a results in a frustrated geometry for the Li + ions that is the origin for rapid Li + exchange in Li-inserted Li 4 + x Ti 5 O 12 , [9a] as also suggested by Wagemaker et al, [9h] Pang et al [24] and Zhang et al [9c] Other studies considered the involvement of 32e split sites [25] as well as occupational disorder, that is, the participation of anti-site defects assisting in Li ion diffusion. [12] In contrast to Ren et al we do only observe two relaxation processes in our LTO sample.…”

Section: Resultsmentioning

confidence: 99%

Broadband impedance spectroscopy of Li₄Ti₅O₁₂: from nearly constant loss effects to long‐range ion dynamics

Gadermaier

Hogrefe

Heitjans

et al. 2021

Zeitschrift anorg allge chemie

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Dedicated to the 60 th birthday of Professor Dr. Josef Breu Li 4 Ti 5 O 12 (LTO) is known as one of the most robust and longlasting anode materials in lithium-ion batteries. As yet, the Liion transport properties of LTO are, however, not completely understood. Here, we used broadband impedance spectroscopy spanning a wide temperature range to investigate the full electrical response of LTO over a wide frequency range. It turned out that the isotherms recorded entail information about two relaxation processes. While at high temperatures the isotherms show a frequency independent plateau that corresponds to poor long-range ion transport (< 10 À 11 S cm À 1 (298 K), 0.79 eV), they reveal a second region, seen at lower temper-atures and higher frequencies, which we attribute to shortrange ion dynamics (10 À 8 S cm À 1 ) with a significantly reduced activation energy of ca. 0.51 eV. At even lower temperatures, the isotherms are fully governed by nearly constant loss behavior, which has frequently been explained by cage-like dynamics. The present results agree with those earlier presented by 7 Li NMR spin-lattice relaxation measurements being sensitive to dynamic processes taking place on quite different length scales. Our findings unveil complex Li + ion dynamics in LTO and help understand its superior electrochemical properties.

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Study on Thermal Simulation of LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂ Battery

et al. 2021

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A thermal simulation model is developed to analyze the thermal behavior of the lithium‐ion battery. This model precisely considers the thermal properties of battery materials, including cathode, anode, and electrolyte. The LiNi0.5Mn1.5O4 (LNMO)/Li4Ti5O12 (LTO) battery is modeled for the first time, and the accuracy is verified by an experimental battery test. The results demonstrate that the thermal runaway of the battery is mainly caused by the decomposition of LNMO. Little heat absorbed by the gasification of electrolyte solvent and highly thermal stable LTO account for a relatively small proportion of the factors leading to the battery temperature rise. The similar results of simulation and accelerating rate calorimeter (ARC) testing under the adiabatic condition indicate that the thermal simulation model utilized in this work is a good guidance for safety design of the LNMO/LTO battery.

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Dielectric relaxation behavior induced by lithium migration in Li4Ti5O12 spinel

Cited by 33 publications

References 46 publications

The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

Broadband impedance spectroscopy of Li₄Ti₅O₁₂: from nearly constant loss effects to long‐range ion dynamics

Study on Thermal Simulation of LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂ Battery

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Dielectric relaxation behavior induced by lithium migration in Li4Ti5O12 spinel

Cited by 33 publications

References 46 publications

The dielectric relaxation behavior induced by sodium migration in the Na2CoSiO4 structure within a three-dimensional Co–O–Si framework

The dielectric relaxation behavior induced by sodium migration in the Na2CoSiO4 structure within a three-dimensional Co–O–Si framework

Broadband impedance spectroscopy of Li4Ti5O12: from nearly constant loss effects to long‐range ion dynamics

Study on Thermal Simulation of LiNi0.5Mn1.5O4/Li4Ti5O12 Battery

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The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

The dielectric relaxation behavior induced by sodium migration in the Na₂CoSiO₄ structure within a three-dimensional Co–O–Si framework

Broadband impedance spectroscopy of Li₄Ti₅O₁₂: from nearly constant loss effects to long‐range ion dynamics

Study on Thermal Simulation of LiNi_0.5Mn_1.5O₄/Li₄Ti₅O₁₂ Battery