Investigation of charge carrier dynamics in positive lithium-ion battery electrodes via optical in situ observation

Rittweger, Florian; Modrzynski, Christian; Roscher, Valentin; Danilov, Dmitri L.; Notten, Peter H. L.; Riemschneider, Karl Ragmar

doi:10.1016/j.jpowsour.2020.228943

Cited by 10 publications

(9 citation statements)

References 43 publications

(50 reference statements)

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“…The reaction front moves towards the separator region to satisfy the charge balance condition. Similar behavior was later experimentally confirmed by Rittweger et al [ 78 ] and denoted as the “intercalation frontier”. Tang et al [ 97 ] investigated the influence of the effective electronic and ionic conductivities on the reaction rate distribution by numerical simulations.…”

Section: Applications To Libssupporting

confidence: 79%

Porous Electrode Modeling and its Applications to Li‐Ion Batteries

Chen

Danilov

Eichel

et al. 2022

Advanced Energy Materials

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Figure 12. a-c) Schematic representation of the electrode potential at electrode/electrolyte interfaces. [145] Red areas indicate the electrode region and blue the electrolyte region. a) The Butler-Volmer approach does not consider charges at the interface. b) More detailed representation of the electrode/ electrolyte interface, considering specifically adsorbed species (green area) and screening counter charges at the surface of the electrode (dark red) and in the electrolyte (dark blue). c) Reduced electrode/electrolyte interface considering the surface charge in the electrode and screening charge in the electrolyte. d) Typical examples of impedance spectra for a porous electrode with insertion-type reactions. [151] Impedance simulations of porous graphite electrodes in contact with electrolyte with e) various particle sizes and f) electrode porosities. [152] a-c) Reproduced with permission. [145]

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Section: Applications To Libssupporting

confidence: 79%

Porous Electrode Modeling and its Applications to Li‐Ion Batteries

Chen

Danilov

Eichel

et al. 2022

Advanced Energy Materials

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“…The longitudinal electrode expansion measurements are performed utilizing an optical in situ observation method described in detail in previous works [49,50]. This method uses Digital Image Correlation (DIC) to track the deformation of the specimen from video recorded microscopical observations during electrochemical cycling.…”

Section: Electrode Expansion Measurementsmentioning

confidence: 99%

“…The electrode thickness and applied current are altered to study how the electrochemical performance of the cell is affected by these parameters. Further, Li-insertion induced longitudinal expansion of carbon fibre electrodes is measured in situ during charge/discharge processes using a Digital Image Correlation (DIC) technique, which is based on previous video microscopical electrode observations [49,50]. Expansion data for carbon fibres in liquid electrolyte (i.e.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational characterization of carbon fibre based structural battery electrode laminae

Carlstedt

Rittweger

Runesson

et al. 2022

Composites Science and Technology

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“…Another method for investigating lithium deposition during cycling is insitu observation using special cell holders. Insitu observations in the ECC-Opto Stud, manufactured by EL-Cells GmbH (Hamburg, Germany), on battery cells were made in [26][27][28][29][30][31][32][33] using Raman spectroscopy, X-ray diffraction (XRD) and optical analytics. Observations were made using Raman spectroscopy [27,31,32] and XRD [26,28,33] to observe changes in electrodes and SEI during aging.…”

Section: Future Workmentioning

confidence: 99%

“…Observations were made using Raman spectroscopy [27,31,32] and XRD [26,28,33] to observe changes in electrodes and SEI during aging. Merryweather et al [29] used the above-mentioned cell housing for optical interferometric scattering measurements to detect single-particle ion dynamics, and Rittweger et al [30] observed the reflectivity of cathodes during charge and discharge.…”

Section: Future Workmentioning

confidence: 99%

Influence of Temperature and Electrolyte Composition on the Performance of Lithium Metal Anodes

et al. 2021

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Lithium metal anodes have again attracted widespread attention due to the continuously growing demand of cells with higher energy density. However, the lithium deposition mechanism and the affecting process of influencing factors, such as temperature, cycling current density, and electrolyte composition are not fully understood and require further investigation. In this article, the behavior of lithium metal anode at different temperatures (25, 40, and 60 ∘C), lithium salts, electrolyte concentrations (1 and 2 M), and the applied cell current (equivalent to 0.5 C, 1 C, and 2 C). is investigated. Two different salts were evaluated: lithium bis(fluorosulfonyl)imide (LiFSI) and lithium bis(trifluoromethanesul-fonyl)imide (LiTFSI). The cells at a medium temperature (40 ∘C) show the highest Coulombic efficiency (CE). However, shorter cycle life is observed compared to the experiments at room temperature (25 ∘C). Regardless of electrolyte type and C-rate, the higher temperature of 60 ∘C provides the worst Coulombic efficiency and cycle life among those at the examined temperatures. A higher C-rate has a positive effect on the stability over the cycle life of the lithium cells. The best performance in terms of long cycle life and relatively good Coulombic efficiency is achieved by fast charging the cell with high concentration LiFSI in 1,2-dimethoxyethane (DME) electrolyte at a temperature of 25 ∘C. The cell has an average Coulombic efficiency of 0.987 over 223 cycles. In addition to galvanostatic experiments, Electrochemical Impedance Spectroscopy (EIS) measurements were performed to study the evolution of the interface under different conditions during cycling.

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Investigation of charge carrier dynamics in positive lithium-ion battery electrodes via optical in situ observation

Cited by 10 publications

References 43 publications

Porous Electrode Modeling and its Applications to Li‐Ion Batteries

Porous Electrode Modeling and its Applications to Li‐Ion Batteries

Experimental and computational characterization of carbon fibre based structural battery electrode laminae

Influence of Temperature and Electrolyte Composition on the Performance of Lithium Metal Anodes

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