Air Sensitivity and Degradation Evolution of Halide Solid State Electrolytes upon Exposure

Recently, halide superionic conductors have emerged as promising solid electrolyte (SE) materials for all-solid-state batteries (ASSBs), owing to their inherent properties combining high Li + conductivity, good chemical and electrochemical oxidation stabilities, and mechanical deformability, compared to sulfide or oxide SEs. In this Review, recent advances in halide Li + -and Na + -conducting SEs are comprehensively summarized. After introducing the ionic diffusion mechanism and related governing factors of the crystal structures, we discuss the design strategies, such as the substitution and synthesis protocols, of the halide materials for further improving their properties. We review theoretical and experimental results on electrochemical stabilities and compatibilities with electrode materials. Moreover, we offer a critical assessment of the challenges and issues associated with the development of practical ASSB applications, such as cost considerations, stabilities in atmospheric air, aqueous solutions, and slurryprocessing, and the wet-slurry or dry fabrication of sheet-type electrodes (or SE membranes) for large-format ASSBs. Based on these discussions, we provide a perspective on the future research directions of halide SEs, emphasizing the need for expanding the materials space.

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Section: Industrial Perspective Of Halide Sesmentioning

confidence: 99%

Emerging Halide Superionic Conductors for All-Solid-State Batteries: Design, Synthesis, and Practical Applications

et al. 2022

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“…( C ) Halide SSEs with different exposure areas have different liquification rates. Adapted with permission from ( 77 ), Copyright 2021, Wiley. ( D ) Using a surface coating to mitigate the degradation of halide SSEs in air.…”

Section: Moisture Stability Of Halide Ssesmentioning

confidence: 99%

“…( E ) Pristine Li 3 InCl 6 and Al 2 O 3 @Li 3 InCl 6 powder shows different absorption rates. Adapted with permission from ( 77 ), Copyright 2021, Wiley. ( F ) Tuning crystal structure to alleviate the air instability of halide SSEs.…”

Section: Moisture Stability Of Halide Ssesmentioning

confidence: 99%

“…Experimentally, Li et al ( 77 ) investigated the air stability of Li 3 InCl 6 and Li 3 YCl 6 and their degradation mechanism upon exposure to air. In comparison, the water absorption rate of Li 3 InCl 6 is quicker than that of Li 3 YCl 6 , whereas the amount of water absorption of Li 3 YCl 6 is more than that of Li 3 InCl 6 due to the higher solubility of InCl 3 compared to YCl 3 .…”

Section: Moisture Stability Of Halide Ssesmentioning

confidence: 99%

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Prospects of halide-based all-solid-state batteries: From material design to practical application

et al. 2022

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The safety of lithium-ion batteries has caused notable concerns about their widespread adoption in electric vehicles. A nascent but promising approach to enhancing battery safety is using solid-state electrolytes (SSEs) to develop all-solid-state batteries, which exhibit unrivaled safety and superior energy density. A new family of SSEs based on halogen chemistry has recently gained renewed interest because of their high ionic conductivity, high-voltage stability, good deformability, and cost-effective and scalable synthesis routes. Here, we provide a comprehensive review of halide SSEs concerning their crystal structures, ion transport kinetics, and viability for mass production. Furthermore, their moisture sensitivity and interfacial challenges are summarized with corresponding effective strategies. Last, halide-based all-solid-state Li-ion and Li-S pouch cells with energy density targets of 400 and 500 Wh kg −1 are projected to guide future endeavors. This work serves as a comprehensive guideline for developing halide SSEs from material design to practical application.

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“…Similarly, halide SEs (Li 3 InCl 6 , etc.) are also sensitive to air/water; when Li 3 InCl 6 is exposed to humid air, it first becomes crystalline hydrate and then decomposes into In 2 O 3 , HCl, and LiCl [44,45]. Although polymer SEs (PEO, etc.)…”

Section: Air/water Instability Of Sesmentioning

confidence: 99%

Air/Water Stability Problems and Solutions for Lithium Batteries

Ming

Chen

et al. 2022

Energy Mater Adv

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Recently, lithium-ion batteries (LIBs) have faced bottlenecks in terms of energy/power density and safety issues caused by flammable electrolytes. In this regard, all-solid-state batteries (ASSBs) may be one of the most promising solutions. However, many key battery materials (such as solid electrolytes (SEs), cathodes, and anodes) are unstable to air/water, which greatly limits their production, storage, transportation, practical applications, and the development of ASSBs. Herein, the research status on air/water stability of SEs, cathodes, and anodes is reviewed. The mechanisms for their air/water instability are revealed in details. The corresponding modification methods are also proposed, with emphasis on the construction strategies of air/water stable protective layers, including ex situ coatings and in situ reactions. Moreover, the application of air/water-stable protective layers in ASSBs is discussed correspondingly. Last but not least, the advantages and disadvantages of various protective layer construction strategies are analyzed, in which their applications in practical production are prospected.

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Air Sensitivity and Degradation Evolution of Halide Solid State Electrolytes upon Exposure

Cited by 68 publications

References 45 publications

Emerging Halide Superionic Conductors for All-Solid-State Batteries: Design, Synthesis, and Practical Applications

Emerging Halide Superionic Conductors for All-Solid-State Batteries: Design, Synthesis, and Practical Applications

Prospects of halide-based all-solid-state batteries: From material design to practical application

Air/Water Stability Problems and Solutions for Lithium Batteries

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