Communication—Quantitative Analysis of Consumption of Fluoroethylene Carbonate Additives on Silicon Alloy Anodes

Yoon, Dong-hwan; Marinaro, Mario; Axmann, Peter; Wohlfahrt‐Mehrens, Margret

doi:10.1149/2.0301811jes

Cited by 21 publications

(16 citation statements)

References 13 publications

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“…In these systems, complete consumption of FEC is marked by a distinct drop in capacity retention. [27,36,37] However, from a material testing perspective, excess electrolyte volumes "turn off" some of the undesired side reactions described above and therefore allow the investigation of other degradation phenomena. [38,39] Lastly, insufficient drying of cell components (electrodes, separators or coin cell parts) or high moisture levels within the electrolyte can lead to electrolyte and electrolyte salt decomposition reactions (e. g., electrolytes containing LiPF 6 as conducting salt), resulting in aging effects.…”

Section: Other Considerations For Cell Manufacturingmentioning

confidence: 99%

Potential and Limitations of Research Battery Cell Types for Electrochemical Data Acquisition

Smith

Stueble

Biasi

et al. 2023

Batteries & Supercaps

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Developing new electrode materials and/or electrolytes for lithium‐ion batteries requires reliable electrochemical testing thereof. For this purpose, in academic research typically hand‐made coin‐type cells are assembled. Their advantage is a rather cheap and facile assembly, and possibility to prepare full‐cells as well as half‐cells, meaning cathode‐anode or electrode‐elemental lithium configurations. Critical parameters for testing data quality and the potential and limitations of cell tests in half‐cell configuration are discussed. Further, on the basis of a round robin test, using highly homogenous commercial electrodes, where graphite is used as anode and LiNi0.33Mn0.33Co0.33O2 (NMC111) as the cathode material, it is shown that data acquired is highly influenced by assembling parameters. Besides known variables such as the amount of electrolyte or electrode positioning, the proper height of the cell stack and the steel grade of the housing material are identified as decisive variables. Finally, it is demonstrated that under proper conditions coin cells can show a great cycle stability of >2200 cycles using 1 C as dis‐/charge rate while retaining a capacity of 80 %. This performance is close to pouch‐type cells containing the same electrodes and electrolyte, which were used as a benchmark system and showed >3500 cycles of lifetime.

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Section: Other Considerations For Cell Manufacturingmentioning

confidence: 99%

Potential and Limitations of Research Battery Cell Types for Electrochemical Data Acquisition

Smith

Stueble

Biasi

et al. 2023

Batteries & Supercaps

View full text Add to dashboard Cite

show abstract

“…It is also crucial to emphasize the relevance that the studies on electrolyte additives have contributed to improving battery performances. It was demonstrated that the use of carbonate-based additives helps to achieve a better quality SEI with an improved coulombic efficiency and a long cycling life [31][32][33][34][35][36]. Furthermore, plenty of research has been addressed on binder materials in which the function is to give a stronger adhesion to avoid electrical disconnection between the particles and the current collector.…”

Section: Introductionmentioning

confidence: 99%

Towards a High-Power Si@graphite Anode for Lithium Ion Batteries through a Wet Ball Milling Process

et al. 2020

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Silicon-based anodes are extensively studied as an alternative to graphite for lithium ion batteries. However, silicon particles suffer larges changes in their volume (about 280%) during cycling, which lead to particles cracking and breakage of the solid electrolyte interphase. This process induces continuous irreversible electrolyte decomposition that strongly reduces the battery life. In this research work, different silicon@graphite anodes have been prepared through a facile and scalable ball milling synthesis and have been tested in lithium batteries. The morphology and structure of the different samples have been studied using X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and scanning and transmission electron microscopy. We show how the incorporation of an organic solvent in the synthesis procedure prevents particles agglomeration and leads to a suitable distribution of particles and intimate contact between them. Moreover, the importance of the microstructure of the obtained silicon@graphite electrodes is pointed out. The silicon@graphite anode resulted from the wet ball milling route, which presents capacity values of 850 mA h/g and excellent capacity retention at high current density (≈800 mA h/g at 5 A/g).

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“…Specifically, it seems that, among the various radiolysis processes for FEC decomposition considered in the literature, 39 the one going through the F loss radical should be the most prevalent under our conditions as no IR band at 1835 cm −1 can be detected in the spectra of Figure 3b. Such a band is quite specific of FEC, 40 and its absence indicates that F-substituted cyclic units are not detectable in the formed polymer.…”

Section: Resultsmentioning

confidence: 99%

Artificial Solid Electrolyte Interphase Formation on Si Nanoparticles through Radiolysis: Importance of the Presence of an Additive

et al. 2019

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In the context of energy transition, irradiation is a powerful tool to mimic quickly the modification of electrode materials upon charge/discharge cycles in lithium-ion batteries. In this study, the evolution of the surface of silicon nanoparticles upon irradiation in two electrolytes, containing or not fluoroethylene carbonate (FEC), was studied. In the presence of elastometric properties of the polymer formed in presence of FEC is thought to be responsible for the formation of the homogeneous layer on the Si surfaces, leading to the generation of an artificial solid SEI through the radiolysis process. This SEI prevents however the efficient transfer of Li + ions and more work is required to optimize its intrinsic (electro)chemical properties.

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Communication—Quantitative Analysis of Consumption of Fluoroethylene Carbonate Additives on Silicon Alloy Anodes

Cited by 21 publications

References 13 publications

Potential and Limitations of Research Battery Cell Types for Electrochemical Data Acquisition

Potential and Limitations of Research Battery Cell Types for Electrochemical Data Acquisition

Towards a High-Power Si@graphite Anode for Lithium Ion Batteries through a Wet Ball Milling Process

Artificial Solid Electrolyte Interphase Formation on Si Nanoparticles through Radiolysis: Importance of the Presence of an Additive

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