Revealing the Role, Mechanism, and Impact of AlF<sub>3</sub> Coatings on the Interphase of Silicon Thin Film Anodes (Adv. Energy Mater. 41/2022)

Adhitama, Egy; Wickeren, Stefan van; Neuhaus, Kerstin; Frankenstein, Lars; Demelash, Feleke; Javed, Atif; Haneke, Lukas; Nowak, Sascha; Winter, Martin; Gómez-Martín, Aurora; Placke, Tobias

doi:10.1002/aenm.202270169

Cited by 4 publications

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“…Additionally, the SEI formed on the coated Si film contained significant proportion of inorganic LiF, enhancing the cycling performance of the battery (Figure 6d). [ 71 ]…”

Section: Sei On Different Negative Electrodementioning

confidence: 99%

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Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Li,

Wang,

Huang

et al. 2023

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Over the past decades, significant advances have been made in lithium‐ion batteries. However, further requirement on the electrochemical performance is still a powerful motivator to improve battery technology. The solid electrolyte interphase (SEI) is considered as a key component on negative electrode, having been proven to be crucial for the performance, even in safety of batteries. Although numerous studies have focused on SEI in recent years, its specific properties, including structure and composition, remain largely unclear. Particularly, LiF, a common and important component in SEI, has sparked debates among researchers, resulting in divergent viewpoints. In this review, the recent research findings on SEI and delve into the characteristics of the LiF component is aim to consolidated. The cause of SEI formation and the evolution of SEI models is summarized. The distinctive properties of SEI generated on various negative electrodes is further discussed, the ongoing scholarly controversy surrounding the function of LiF within SEI, and the specific physicochemical properties about LiF and its synergistic effect in heterogeneous components. The objective is to facilitate better understanding of SEI and the role of the LiF component, ultimately contributing to the development of Li batteries with enhanced electrochemical performance and safety for battery communities.

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“…Additionally, the SEI formed on the coated Si film contained significant proportion of inorganic LiF, enhancing the cycling performance of the battery (Figure 6d). [ 71 ]…”

Section: Sei On Different Negative Electrodementioning

confidence: 99%

“…The results showed that AlF 3 is transformed into a Li-Al-F compound with high Li + conductivity during the lithiation/delithiation process, improving the rate performance of the battery. Additionally, the SEI formed on the coated Si film contained significant proportion of inorganic LiF, enhancing the cycling performance of the battery (Figure6d) [71].…”

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confidence: 99%

Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Li,

Wang,

Huang

et al. 2023

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“…Ideally, protective coatings are thin and homogeneous, preferably ionically conductive, have good electrochemical and thermal stability and are overall cost‐effective [17] . In literature, a wide range of coatings were explored, ranging from metallic oxides (Al 2 O 3 , [18] SiO 2 , TiO 2 , [19] WO 3 , [5] ZrO 2 [20] ), phosphates (Li 3 PO 4 [21] and AlPO 4 [22] ) and fluorides (AlF 3 [23] and LiF [24] ) to conductive polymer‐based coatings (polypyrrole and polyaniline) [25] each of them having their own advantages and disadvantages. Protective coatings and interphases act, among others as a physical barrier between active material and electrolyte, mitigating parasitic side reactions and thus preventing the formation of decomposition products and subsequently enhancing the overall electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Interphase design of LiNi_0.6Mn_0.2Co_0.2O₂ as positive active material for lithium ion batteries via Al₂O₃ coatings using magnetron sputtering for improved performance and stability

Javed,

Makvandi,

Demelash

et al. 2024

Batteries & Supercaps

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LiNixMnyCozO2 (x+y+z=1) is one of the most present and versatile positive active materials for lithium ion batteries due to comparatively high specific capacity and high operating potential. However, NMC materials are prone to various degradation effects including moisture uptake, formation of impurities at the particle surface and transition metal dissolution during charge/discharge cycling and/or at elevated temperatures. Beyond that, cation mixing can lead to phase transformation, oxygen evolution, particle cracking and particle disintegration. Therefore, an alumina coating was applied and optimized as protective interphase on LiNi0.6Mn0.2Co0.2O2 (NMC622) powders, using a specifically in‐house developed RF‐magnetron sputtering technique. The alumina coated NMC622 showed a 13% improvement in capacity retention after 200 charge/discharge cycles in lab‐scale cells, compared to pristine uncoated NMC622. Using electrochemical impedance spectroscopy, the interfacial/interphasial resistance of pristine and alumina coated NCM622 based electrodes were explored to study the impact of the coating on lithium ion transport. Furthermore, the structural and thermal stability of cyclic aged NMC622 were analyzed via TEM, EELS and TGA. Therein, alumina coated samples demonstrated enhanced thermal stability, less structural degradation, and reduced particle cracking.

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“…In order to tackle the issues of Si anode, various strategies have been proposed. [ 16–22 ] Among them, the most common approach is to downsize bulk Si to nanoscale via structural designs of nanowires, hollow nanospheres, nanosheets, and so on, [ 23–30 ] which can mitigate mechanical fracture of the materials to some extent. Additionally, incorporating nanostructured Si with carbonaceous materials by interface modification and hollow/porous structure construction can further lead to the achievement of electrode structures with improved specific capacity and long‐term cycle life.…”

Section: Introductionmentioning

confidence: 99%

Tight Binding and Dual Encapsulation Enabled Stable Thick Silicon/Carbon Anode with Ultrahigh Volumetric Capacity for Lithium Storage

Zhang

Gui

Zhang

et al. 2023

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Silicon (Si) is regarded as one of the most promising anode materials for high‐performance lithium‐ion batteries (LIBs). However, how to mitigate its poor intrinsic conductivity and the lithiation/delithiation‐induced large volume change and thus structural degradation of Si electrodes without compromising their energy density is critical for the practical application of Si in LIBs. Herein, an integration strategy is proposed for preparing a compact micron‐sized Si@G/CNF@NC composite with a tight binding and dual‐encapsulated architecture that can endow it with superior electrical conductivity and deformation resistance, contributing to excellent cycling stability and good rate performance in thick electrode. At an ultrahigh mass loading of 10.8 mg cm−2, the Si@G/CNF@NC electrode also presents a large initial areal capacity of 16.7 mA h cm−2 (volumetric capacity of 2197.7 mA h cm−3). When paired with LiNi0.95Co0.02Mn0.03O2, the pouch‐type full battery displays a highly competitive gravimetric (volumetric) energy density of ≈459.1 Wh kg−1 (≈1235.4 Wh L−1).

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Revealing the Role, Mechanism, and Impact of AlF₃ Coatings on the Interphase of Silicon Thin Film Anodes (Adv. Energy Mater. 41/2022)

Cited by 4 publications

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Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Interphase design of LiNi_0.6Mn_0.2Co_0.2O₂ as positive active material for lithium ion batteries via Al₂O₃ coatings using magnetron sputtering for improved performance and stability

Tight Binding and Dual Encapsulation Enabled Stable Thick Silicon/Carbon Anode with Ultrahigh Volumetric Capacity for Lithium Storage

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Revealing the Role, Mechanism, and Impact of AlF3 Coatings on the Interphase of Silicon Thin Film Anodes (Adv. Energy Mater. 41/2022)

Cited by 4 publications

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Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Unveiling the Mystery of LiF within Solid Electrolyte Interphase in Lithium Batteries

Interphase design of LiNi0.6Mn0.2Co0.2O2 as positive active material for lithium ion batteries via Al2O3 coatings using magnetron sputtering for improved performance and stability

Tight Binding and Dual Encapsulation Enabled Stable Thick Silicon/Carbon Anode with Ultrahigh Volumetric Capacity for Lithium Storage

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Revealing the Role, Mechanism, and Impact of AlF₃ Coatings on the Interphase of Silicon Thin Film Anodes (Adv. Energy Mater. 41/2022)

Interphase design of LiNi_0.6Mn_0.2Co_0.2O₂ as positive active material for lithium ion batteries via Al₂O₃ coatings using magnetron sputtering for improved performance and stability