Mechanical behavior of Li-ion-conducting crystalline oxide-based solid electrolytes: a brief review

Wolfenstine, J.; Allen, J. S.; Sakamoto, Jeff; Siegel, Donald J.; Choe, Heeman

doi:10.1007/s11581-017-2314-4

Cited by 160 publications

(172 citation statements)

References 32 publications

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“…279−281 There are three main mechanical properties of SEs and Li that are related to the dendritic growth of Li. 14,282 They are (1) Elastic behavior of the SE. The Young's modulus of the SE depends on the crystal structure and is independent of grain size and grain orientation.…”

Section: Mechanical Effectsmentioning

confidence: 99%

Interfaces and Interphases in All-Solid-State Batteries with Inorganic Solid Electrolytes

et al. 2020

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All-solid-state batteries (ASSBs) have attracted enormous attention as one of the critical future technologies for safe and high energy batteries. With the emergence of several highly conductive solid electrolytes in recent years, the bottleneck is no longer Li-ion diffusion within the electrolyte. Instead, many ASSBs are limited by their low Coulombic efficiency, poor power performance, and short cycling life due to the high resistance at the interfaces within ASSBs. Because of the diverse chemical/physical/mechanical properties of various solid components in ASSBs as well as the nature of solid−solid contact, many types of interfaces are present in ASSBs. These include loose physical contact, grain boundaries, and chemical and electrochemical reactions to name a few. All of these contribute to increasing resistance at the interface. Here, we present the distinctive features of the typical interfaces and interphases in ASSBs and summarize the recent work on identifying, probing, understanding, and engineering them. We highlight the complicated, but important, characteristics of interphases, namely the composition, distribution, and electronic and ionic properties of the cathode−electrolyte and electrolyte−anode interfaces; understanding these properties is the key to designing a stable interface. In addition, conformal coatings to prevent side reactions and their selection criteria are reviewed. We emphasize the significant role of the mechanical behavior of the interfaces as well as the mechanical properties of all ASSB components, especially when the soft Li metal anode is used under constant stack pressure. Finally, we provide full-scale (energy, spatial, and temporal) characterization methods to explore, diagnose, and understand the dynamic and buried interfaces and interphases. Thorough and in-depth understanding on the complex interfaces and interphases is essential to make a practical high-energy ASSB.

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Section: Mechanical Effectsmentioning

confidence: 99%

Interfaces and Interphases in All-Solid-State Batteries with Inorganic Solid Electrolytes

et al. 2020

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“…between grain boundary structure and the inside grain of SSEs was reported to control the nucleation of Li dendrites at the interface. [ 19,20 ] To enable a robust Li/GSEs interface for garnet‐based solid‐state Li metal batteries (SSLBs), it is necessary to take the success of lithium phosphate oxynitride (LIPON) as an reference: The uniform sputtered LIPON film enables high efficiency Li anode via kinetic interface stabilization process, which forms nanometrically thin, Li‐ion conductive but electron‐insulating interphase. [ 21 ] On the other hand, the homogenous surface of LIPON film realizes uniform Li dissolution/deposition, which thereby reduces the interface resistance and avoids the formation of localized hot spots for dendrite‐like Li nucleation.…”

Section: Figurementioning

confidence: 99%

Tuning the Anode–Electrolyte Interface Chemistry for Garnet‐Based Solid‐State Li Metal Batteries

et al. 2020

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Lithium (Li) metal is a promising candidate as the anode for high‐energy‐density solid‐state batteries. However, interface issues, including large interfacial resistance and the generation of Li dendrites, have always frustrated the attempt to commercialize solid‐state Li metal batteries (SSLBs). Here, it is reported that infusing garnet‐type solid electrolytes (GSEs) with the air‐stable electrolyte Li3PO4 (LPO) dramatically reduces the interfacial resistance to ≈1 Ω cm2 and achieves a high critical current density of 2.2 mA cm−2 under ambient conditions due to the enhanced interfacial stability to the Li metal anode. The coated and infused LPO electrolytes not only improve the mechanical strength and Li‐ion conductivity of the grain boundaries, but also form a stable Li‐ion conductive but electron‐insulating LPO‐derived solid‐electrolyte interphase between the Li metal and the GSE. Consequently, the growth of Li dendrites is eliminated and the direct reduction of the GSE by Li metal over a long cycle life is prevented. This interface engineering approach together with grain‐boundary modification on GSEs represents a promising strategy to revolutionize the anode–electrolyte interface chemistry for SSLBs and provides a new design strategy for other types of solid‐state batteries.

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“…Solid-state electrolytes (SSEs) have been regarded as ideal electrolytes to physically curb the growth of the Li dendrites and eliminate irreversible electrolyte consumption ( 5 ). According to the stability criterion proposed by Monroe and Newman ( 6 ), almost all of the promising SSEs, such as Li 3 PS 4 (LPS), Li 10 GeP 2 S 12 (LGPS), Li 3 x La 2/3- x TiO 3 (LLTO), Li 7 La 3 Zr 2 O 12 (LLZO), and their related derivatives, should be able to prevent Li dendrite formation because of their high mechanical strength ( 7 ). Moreover, the Sand’s time (the starting time for the Li dendrite initiation) of the SSEs should be infinite since their Li + transference numbers are approaching to 1 ( 8 ).…”

Section: Introductionmentioning

confidence: 99%

Fluorinated solid electrolyte interphase enables highly reversible solid-state Li metal battery

et al. 2018

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Mechanical behavior of Li-ion-conducting crystalline oxide-based solid electrolytes: a brief review

Cited by 160 publications

References 32 publications

Interfaces and Interphases in All-Solid-State Batteries with Inorganic Solid Electrolytes

Interfaces and Interphases in All-Solid-State Batteries with Inorganic Solid Electrolytes

Tuning the Anode–Electrolyte Interface Chemistry for Garnet‐Based Solid‐State Li Metal Batteries

Fluorinated solid electrolyte interphase enables highly reversible solid-state Li metal battery

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