Nanoindentation of high-purity vapor deposited lithium films: The elastic modulus

Herbert, Erik G.; Hackney, S.A.; Dudney, Nancy J.; Phani, P. Sudharshan

doi:10.1557/jmr.2018.83

Cited by 46 publications

(35 citation statements)

References 29 publications

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“…As previously reported, 5 A in this particular case is given by a 6-term polynomial function written in terms of the contact depth, h c . Justified by the extremely high elastic modulus to yield strength ratio of Li, E/r y 5 ;16,000, here we adopt a simplified version of the polynomial function by taking h c to be the indentation depth, h, i.e., h c 5 h. Other researchers have adopted precisely the same definition for h c when working with similar ratios of E/r y such as indium.…”

Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 52%

“…5 To avoid unnecessary duplication, only the unique aspects of determining the hardness as a continuous function of indentation depth are addressed here.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…8 The significant advantage of this definition is that it does not require the use of the Oliver-Pharr model to determine h c and, thus, it eliminates the need to determine the elastic contact stiffness, S, through the slope of the unloading curve or through the use of dynamic measurement techniques, both of which can be difficult to accurately implement when E/r y is large. 5 Physically, this definition ignores the elastic deflection of the contact perimeter and assumes A is in the original plane of the surface. Among the previously reported results, optical microscopy of the residual hardness impressions shows no discernible evidence of pile-up or any characteristic features of sink-in, thereby indicating that the simplified definition of h c is a valid approximation at deep depths.…”

Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 99%

“…Among the previously reported results, optical microscopy of the residual hardness impressions shows no discernible evidence of pile-up or any characteristic features of sink-in, thereby indicating that the simplified definition of h c is a valid approximation at deep depths. 5 …”

Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 99%

“…Under conditions previously identified, this loading algorithm results in a constant indentation strain rate, defined as _ h=h. [5][6][7][8] In the second loading method, the loading rate was held constant at 12.5 lN/s. Both loading algorithms terminate with a 60 s hold at P max .…”

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confidence: 99%

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Nanoindentation of high-purity vapor deposited lithium films: A mechanistic rationalization of diffusion-mediated flow

et al. 2018

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Nanoindentation experiments performed in 5 and 18 lm thick vapor deposited polycrystalline lithium films at 31°C reveal the mean pressure lithium can support is strongly dependent on length scale and strain rate. At the smallest length scales (indentation depths of 40 nm), the mean pressure lithium can support increases from ;23 to 175 MPa as the indentation strain rate increases from 0.195 to 1.364 s À1. Furthermore, these pressures are ;46-350 times higher than the nominal yield strength of bulk polycrystalline lithium. The length scale and strain rate dependent hardness is rationalized using slightly modified forms of the Nabarro-Herring and Harper-Dorn creep mechanisms. Load-displacement curves suggest a stress and length-scale dependent transition from diffusion to dislocation-mediated flow. Collectively, these experimental observations shed significant new light on the mechanical behavior of lithium at the length scale of defects existing at the lithium/solid electrolyte interface.

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Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 52%

“…5 To avoid unnecessary duplication, only the unique aspects of determining the hardness as a continuous function of indentation depth are addressed here.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 99%

Section: A Determination Of the Hardness (The Mean Pressure LI Can Smentioning

confidence: 99%

mentioning

confidence: 99%

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Nanoindentation of high-purity vapor deposited lithium films: A mechanistic rationalization of diffusion-mediated flow

et al. 2018

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A Lithium Intrusion‐Blocking Interfacial Shield for Wide‐Pressure‐Range Solid‐State Lithium Metal Batteries

Hu,

Yu,

Wang

et al. 2023

Advanced Materials

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Lithium garnets are considered as promising solid–state electrolytes for next–generation solid–state Li metal batteries (SSLBs). However, the Li intrusion driven by external stack pressure triggers premature of Li metal batteries. Herein, for the first time, we report an in situ constructed interfacial shield to efficiently inhibit the pressure–induced Li intrusion in SSLBs. Theoretical modeling and experimental investigations reveal that high–hardness metallic Mo nanocrystals inside the shield effectively suppress Li dendrite growth without alloy hardening–derived interfacial contact deterioration. Meanwhile the electrically insulated Li2S as a shield component considerably promotes interfacial wettability and hinders Li dendrite penetration into the bulk of garnet electrolyte. Interfacial shield–protected Li6.4La3Zr1.4Ta0.6O12 (LLZTO)–based cells exhibit significantly enhanced cyclability without short circuits under conventional pressures of ≈0.2 MPa and even at high pressure of up to 70 MPa; which is the highest endurable stack pressure reported for SSLBs using garnet electrolytes. These key findings are expected to promote the wide–pressure–range applications of SSLBs.This article is protected by copyright. All rights reserved

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Progress and Perspective of Controlling Li Dendrites Growth in All‐Solid‐State Li Metal Batteries via External Physical Fields

Yao,

Zhu,

Dong

et al. 2023

Adv Energy and Sustain Res

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Li dendrites penetration through solid electrolytes (SEs) challenges the development of solid‐state Li batteries (SSLBs). To date, significant efforts are devoted to understand the mechanistic dynamics of Li dendrites nucleation, growth, and propagation in SEs, and various strategies that aim to alleviate and even inhibit Li dendrite formation have been proposed. Nevertheless, most of these conventional strategies require either additional material processing steps or new materials/layers that eventually increase battery cost and complexity. In contrast, using external fields, such as mechanical force, temperature physical field, electric field, pulse current, and even magnetic field to regulate Li dendrites penetration through SEs, seems to be one of the most cost‐effective strategies. This review focuses on the current research progress of utilizing external physical fields in regulating Li dendrites growth in SSLBs. For this purpose, the mechanical properties of Li and SEs, as well as the experimental results that visually track Li penetration dynamics, are reviewed. Finally, the review ends with remaining open questions in future studies of Li dendrites growth and penetration in SEs. It is hoped this review can shed some light on understanding the complex Li dendrite issues in SSLBs and potentially guide their rational design for further development.

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Nanoindentation of high-purity vapor deposited lithium films: The elastic modulus

Abstract: Abstract

Cited by 46 publications

References 29 publications

Nanoindentation of high-purity vapor deposited lithium films: A mechanistic rationalization of diffusion-mediated flow

Nanoindentation of high-purity vapor deposited lithium films: A mechanistic rationalization of diffusion-mediated flow

A Lithium Intrusion‐Blocking Interfacial Shield for Wide‐Pressure‐Range Solid‐State Lithium Metal Batteries

Progress and Perspective of Controlling Li Dendrites Growth in All‐Solid‐State Li Metal Batteries via External Physical Fields

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