Improving cyclability of Li metal batteries at elevated temperatures and its origin revealed by cryo-electron microscopy

Wang, Jiangyan; Huang, William; Pei, Allen; Li, Yuzhang; Shi, Feifei; Yu, Xiaoyun; Cui, Yi

doi:10.1038/s41560-019-0413-3

Cited by 390 publications

(407 citation statements)

References 35 publications

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“…In another SEI area between Li metal dendrite and carbonate‐based electrolyte with (10 vol%) fluoroethylene carbonate (FEC), a multilayer structure containing an amorphous polymer matrix inner layer and Li oxide outer layer is observed (Figure 22b). 19 They further connected the interface structure with the operation temperature of Li ion batteries 379. A high operating temperature of 60 °C leads to larger Li particles and better crystallized SEI nanostructure than those at 20 °C.…”

Section: Materials Science Applications and Discoveriesmentioning

confidence: 98%

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Imaging Beam‐Sensitive Materials by Electron Microscopy

et al. 2020

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Electron microscopy allows the extraction of multidimensional spatiotemporally correlated structural information of diverse materials down to atomic resolution, which is essential for figuring out their structureproperty relationships. Unfortunately, the high-energy electrons that carry this important information can cause damage by modulating the structures of the materials. This has become a significant problem concerning the recent boost in materials science applications of a wide range of beam-sensitive materials, including metal-organic frameworks, covalent-organic frameworks, organicinorganic hybrid materials, 2D materials, and zeolites. To this end, developing electron microscopy techniques that minimize the electron beam damage for the extraction of intrinsic structural information turns out to be a compelling but challenging need. This article provides a comprehensive review on the revolutionary strategies toward the electron microscopic imaging of beamsensitive materials and associated materials science discoveries, based on the principles of electron-matter interaction and mechanisms of electron beam damage. Finally, perspectives and future trends in this field are put forward. he worked as a postdoctoral fellow and research scientist at King Abdullah University of Science and Technology. His research interests now focus on low-dose electron microscopy and structural elucidation of beam-sensitive materials for applications such as catalysis, gas separation, and energy conversion/storage.

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Section: Materials Science Applications and Discoveriesmentioning

confidence: 98%

“…A high operating temperature of 60 °C leads to larger Li particles and better crystallized SEI nanostructure than those at 20 °C. Such interfacial structure results in faster charge transport kinetics, enhanced Coulombic efficiency and better stability 379…”

Section: Materials Science Applications and Discoveriesmentioning

confidence: 99%

Imaging Beam‐Sensitive Materials by Electron Microscopy

et al. 2020

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“…Wang et al further revealed drastically different SEI nanostructures emerging at different temperatures (20 °C and 60 °C) using cryo-TEM technique. [75] Specifically, an amorphous SEI formed at 20 °C (Figure 9h) possesses poor mechanical properties and is easier to fracture during cycling. This amorphous SEI offers limited passivation effect on the Li metal and leads to continuous SEI reformation and poor interfacial stability.…”

Section: Operating Temperaturementioning

confidence: 99%

Interface Engineering for Lithium Metal Anodes in Liquid Electrolyte

Zhai

Liu

et al. 2020

Advanced Energy Materials

290

194

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Interfacial chemistry between lithium metal anodes and electrolytes plays a vital role in regulating the Li plating/stripping behavior and improving the cycling performance of Li metal batteries. Constructing a stable solid electrolyte interphase (SEI) on Li metal anodes is now understood to be a requirement for progress in achieving feasible Li‐metal batteries. Recently, the application of novel analytical tools has led to a clearer understanding of composition and the fine structure of the SEI. This further promoted the development of interface engineering for stable Li metal anodes. In this review, the SEI formation mechanism, conceptual models, and the nature of the SEI are briefly summarized. Recent progress in probing the atomic structure of the SEI and elucidating the fundamental effect of interfacial stability on battery performance are emphasized. Multiple factors including current density, mechanical strength, operating temperature, and structure/composition homogeneity that affect the interfacial properties are comprehensively discussed. Moreover, strategies for designing stable Li‐metal/electrolyte interfaces are also reviewed. Finally, new insights and future directions associated with Li‐metal anode interfaces are proposed to inspire more revolutionary solutions toward commercialization of Li metal batteries.

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“…Meanwhile, several key factors would still affect the cycling performance of LMB and are crucial in achieving high specific energy of 500 Wh kg -1 demanded by electric vehicle energy-storage market such as electrolyte amount 17 , temperature 18 , pressure 19 , amount of Li or cahode 20,21 , and current density applied 9 , etc. Recently, Anode-free lithium metal batteries (AFLMBs) are considered as phenomenal energy storage systems due to higher energy density than that of LMB which with excess Li in the system, and greatly reduced safety risks since no Li metal is used during cell manufacturing, which remarkably increases the simplicity of cell fabrication and reduces the cost of cell assembly, too 22,23,24,25,26,27 .…”

mentioning

confidence: 99%

Unfolding the Hidden Message of Anode-Free Lithium Metal Battery

Huang¹,

Thirumalraj²,

Tao³

et al. 2020

Preprint

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Lithium metal batteries (LMBs) have been revisited and gained great attention due to significantly mitigated formation of Li dendrite in the past decade. Recently, anode-free lithium metal batteries (AFLMBs) are proposed and have been studied intensively to potentially outperform LMBs due to higher energy density and reduced safety hazards since the absence of Li metal during the fabrication process of the cell. In general, researchers compare capacity retention, reversible capacity, or rate capability of the cells to study the electrochemical performance of batteries. However, evaluating the behavior of batteries from limited aspects would easily overlook other information hidden deep inside the meretricious results or even lead to misguided data interpretation. In this work, an integrated protocol combining different types of cell configuration is proposed and validated for the first time to unravel the concealed messages in LMBs and AFLMBs. Irreversible coulombic efficiency (irr-CE) from various contributions including reductive electrolyte decomposition, dead Li formation, 1st intrinsic irreversible capacity of a cathode, and the subsequent irreversible reactions at cathode containing oxidative electrolyte decomposition and cathode degradation upon cycling are successfully determined separately by the integrated protocol for the first time. The decrypted information obtained from the proposed protocol provides an insightful understanding of behaviors of LMBs and AFLMBs, which promotes their development for practical applications.

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Improving cyclability of Li metal batteries at elevated temperatures and its origin revealed by cryo-electron microscopy

Cited by 390 publications

References 35 publications

Imaging Beam‐Sensitive Materials by Electron Microscopy

Imaging Beam‐Sensitive Materials by Electron Microscopy

Interface Engineering for Lithium Metal Anodes in Liquid Electrolyte

Unfolding the Hidden Message of Anode-Free Lithium Metal Battery

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