Ionic processes in solid-electrolyte passivating films on lithium

Чуриков, А. В.; Gamayunova, I. M.; Широков, А. В.

doi:10.1007/s100080050198

Cited by 23 publications

(16 citation statements)

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“…where 𝜀 0 and 𝜀 are the vacuum permittivity and the relative permittivity (dielectric constant), respectively (𝜀 Li 2 O = 8.9, 𝜀 LiF = 9.0) 33,46 and 𝐴 is the known electrode area (𝐴 = 1.77 cm 2 ). The Warburg impedance for the charge carrier diffusion is 𝑍 𝑊 = √2𝑊 √𝑖𝜔 , where 𝜔 is the angular frequency and the Warburg constant 𝑊 is defined as:…”

Section: Equivalent Circuit and Physical Model Of Seimentioning

confidence: 99%

“…In this context, this work seeks to provide new experimental insight into transport within the Li SEI, and specifically, into the contributions of individual ionic phases omnipresent at such interfaces with a particular emphasis on Li 2 O. Although Li 2 O has been extensively studied as a bulk material, for example, as sintered pellets, single crystals, or bulk powders, and characterized electrochemically in bulk by electrochemical impedance spectroscopy (EIS) or solid state nuclear magnetic resonance measurements, 21,27−32 33,34 Results are also compared with similarly formed Li|LiF interfaces synthesized using a fluorinated gas reactant. 35 As much as three orders-of-magnitude difference in ionic conductivity is observed between the single-component Li 2 O SEI (∼10 −9 S/cm) and that of sintered bulk Li 2 O pellets reported in the literature 21 (∼10 −12 S/cm) at room temperature, underscoring the conclusion that Li-derived interphases present in actual battery environments differ significantly from their bulk counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

2020

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Lithium (Li) anodes suffer numerous challenges arising from the chemically inhomogeneous nature of the native solid electrolyte interphase (SEI), which impedes smooth plating and leads to dendrite growth. In spite of much attention paid to engineering Li interfaces of late, there is still limited understanding of the desired chemical composition of an improved Li SEI. One major challenge has been a lack of empirical data on the structure-property-performance relations in individual SEI phases, and specifically those present at a metallic Li interface, where the chemical potential imposed by Li will yield different material properties than the bulk analogues typically invoked to understand SEI behavior. Herein, we report preparation of single-component SEIs of lithium oxide (Li2O) grown ex situ onto Li foils by controlled metal-gas reactions, generating 'deconstructed' model interfaces with nanoscale thickness (20-100 nm) similar to the native, yet more complex multiphasic SEI. The model Li|Li2O electrodes serve as a platform for further chemical and electrochemical characterization. In particular, electrochemical impedance spectroscopy, combined with interface modeling, is used to extract transport properties (ionic conductivity, diffusivity, charge carrier concentration and activation energy barriers) of Li|Li2O in symmetric cells with EC/DEC electrolyte. The Li2O SEI is further studied as a function of synthesis condition, revealing microstructural sensitivities that can be tuned to modulate transport behaviors. Finally, results are compared with single-phase Li|LiF interfaces synthesized herein and with the native SEI to isolate chemistry-and structure-specific differences.

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Section: Equivalent Circuit and Physical Model Of Seimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

2020

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“…To examine the interface stability of pretreated and untreated lithium electrode, impedance analysis (EIS) of these electrodes were performed [15,16] . Fig.1 shows the cole-cole plots of the untreated and DOA pretreated lithium electrode at open potential, respectively.…”

Section: Interface Stability During Immersion In Electrolytementioning

confidence: 99%

Improvement of lithium interface stability with 1,4-dioxane pretreatment

Ding

Liu³

2007

J. Wuhan Univ. Technol.

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1,4-dioxane (DOA) was originally used to pretreat the lithium metal electrode in order to improve its interface stability. Electrochemical impedance spectra (EIS) measurements reveal that with DOA pretreatment, lithium electrode has a low and stable interfacial resistance during the storage in electrolyte for a long time. And it is also found that the pretreated lithium electrode has an improved interfacial performance in repeated charge/discharge cycles. Furthermore, it is proved by SEM that the pretreated one has smooth morphology after long-time storage or repeated charge/discharge cycles. Consequentially, because of more stable interface characteristics of lithium electrode, the rechargeable lithium cell with DOA pretreated lithium anode has an obviously enhanced discharging performance and a better cycleability, compared with that of the cell using the untreated lithium anode.

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“…They consist of semicircles capturing a high frequency region, turning into samples 4 and 6, the impedance curves in the low frequ- ency region have an additional section in the form of a small semicircle. The semicircle in the high-frequency region is characteristic for many lithium systems in which a passive film is formed on the lithium electrode, the nature and character of which depend on the composition of the electrolyte and the state of the electrodes [22,23].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characteristics of Tin Films in Cycling in Lithium-Ion Batteries

et al. 2019

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Thin electrolytic fine tin sediments were obtained from pyrophosphate electrolyte under different electrolysis conditions and duration. The electrochemical characteristics of tin coatings as anode materials of lithium-ion batteries are studied using potentiodynamic and galvanostatic cycling methods. The effect of the properties of coatings, in particular their mass, on the value of specific capacitance and its stability, including during discharge with different current densities, has been established. It is shown that the studied tin sediments have high initial specific capacity that is close to theoretically possible. The maximum stability of the specific capacity during cycling is characteristic of electrodes with minimal masses of precipitation. The impedance spectra recorded for the studied electrodes in the initial state and after the first lithiation are analyzed.

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Ionic processes in solid-electrolyte passivating films on lithium

Cited by 23 publications

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Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

Improvement of lithium interface stability with 1,4-dioxane pretreatment

Electrochemical Characteristics of Tin Films in Cycling in Lithium-Ion Batteries

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Ionic processes in solid-electrolyte passivating films on lithium

Cited by 23 publications

References 0 publications

Li2O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

Li2O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

Improvement of lithium interface stability with 1,4-dioxane pretreatment

Electrochemical Characteristics of Tin Films in Cycling in Lithium-Ion Batteries

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Product

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Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium

Li₂O Solid Electrolyte Interphase: Probing Transport Properties at the Chemical Potential of Lithium