On the Interpretation of Impedance Spectra of Large‐Format Lithium‐Ion Batteries and Its Application in Aging Studies

Heins, Tom Patrick; Schlüter, Nicolas; Ernst, S.; Schröder, Uwe

doi:10.1002/ente.201900279

Cited by 31 publications

(27 citation statements)

References 29 publications

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“…For each electrode, the area of the high frequency surface process is bigger than the lower frequency charge transfer‐related one. As the area under the peaks is directly proportional to the resistance of the process, [45] the former is the one that dominates the kinetics for all the electrodes. For Sn and graphite anodes (panels C and E) the frequency of the SEI‐related process remains constant throughout cycling and the charge transfer one downshifts.…”

Section: Resultsmentioning

confidence: 99%

A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si

Smrekar

Bracamonte

Primo

et al. 2020

Batteries & Supercaps

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Nowadays, there is an evident need to improve the current Li‐ion battery systems, in order to make them more reliable, durable and safe. Regarding this objective, the application of composite materials –based mainly on the combination of Si, Sn and carbon– appears as a very promising alternative for future anode materials. However, despite the great amount of publications dealing with this topic, there is not a systematic study that allows interpreting and understanding how the combination of these materials affects the electrochemical performance of the anodes prepared with them. In light of this need, in this work we propose a straightforward ball‐milling procedure to prepare Sn/Si/graphite composites with different mass proportions of each material. For all compositions, a systematic study was performed in order to determine how each material affects the specific capacity, capacity fading and stability towards a change in loading current. We found that the material prepared with Sn33Si33C33 appears to be the most promising one, delivering a reversible capacity of 906.9 mAh g−1 even after 120 cycles at 0.5 A g−1, thus encouraging the development of new composites based on these materials for industrial applications.

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Section: Resultsmentioning

confidence: 99%

A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si

Smrekar

Bracamonte

Primo

et al. 2020

Batteries & Supercaps

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“…Based on the findings from an earlier study, we have assigned the time constants to their underlying electrochemical processes as listed in Table . The time constants τ 3 and τ 4 represent the charge transfer processes at cathode and anode; τ 1 and τ 2 are due to electrical phenomena in the electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…It enables a well‐founded determination of the number of time constants and thus of the number of loss processes from the spectrum . In a previous study, we deduced the exact assignment of the time constants to the corresponding underlying loss processes in lithium‐ion cells . Thereby, anodic and cathodic contributions to the cell kinetics can be distinguished by means of EIS without the use of a reference electrode .…”

Section: Introductionmentioning

confidence: 99%

Impedance Spectroscopic Investigation of the Impact of Erroneous Cell Assembly on the Aging of Lithium‐Ion Batteries

et al. 2019

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The impact of erroneously aligned electrodes on the aging of stacked large‐format lithium‐ion batteries is monitored by electrochemical impedance spectroscopy (EIS). Based on the application of the distribution of relaxation times (DRT) method, the deterioration of the kinetics of anode and cathode due to prolonged cycling can be determined individually. Cells with different degrees of erroneous electrode positioning are produced and compared. Thereby, the origin of the accelerated aging of cells with misaligned electrodes is revealed.

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“…In a first attempt, an EEC composed of a serial connection of an ohmic resistor and a parallel connection of a resistor and an inductor was used (cf. Equation (16)). Furthermore, a second electrical circuit was investigated, which included an additional inductor, connected in series to the previously mentioned EEC (cf.…”

Section: Experimental Data Of a Lithium-ion Cellmentioning

confidence: 99%

“…[14] Based on the DRT outcome, a suitable EEC for a subsequent CNLS fitting is then accessible. [15,16] Equation 2connects the frequency w dependent experimental impedance Z exp w ð Þ with its underlying distribution f t ð Þ of relaxation times t. [17] Here, R 0 summarizes the pure ohmic resistances of the investigated impedance spectrum.…”

Section: Introductionmentioning

confidence: 99%

Quality‐Indicator‐Based Preprocessing for the Distribution of Relaxation Times Method

et al. 2021

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The deconvolution of impedance data to their respective distribution of relaxation times (DRT) is accompanied by an increase in the resolution of the frequency domain and is, thus, advantageous. Yet, most of the techniques used for computing DRT spectra from experimental data are valid only for impedance spectra that solely show polarization processes. Therefore, most experimental electrochemical impedance spectra must be corrected from perturbing inductive, capacitive, or diffusive contributions. This preprocessing is time consuming, and its quality has an enormous impact on the obtained DRT spectra. It also prohibits using the DRT method within an automated impedance evaluation. In this work, we propose a software-aided approach for deriving optimal preprocessing. For this purpose, we first introduce a quality indicator that reflects the quality of a certain preprocessing. Based on this quality indicator, we furthermore introduce a new batch fitting approach for deriving the optimal equivalent electrical circuit within the preprocessing of experimental impedance spectra. Besides, the batch fitting displays the optimal frequency range for modeling the unwanted impedance fractions. Based on this information, the considered impedance data can finally be optimally corrected from any non-polarization processes. The new methods and their application are tested for simulated data and experimental impedance data of a lithium-ion cell.

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On the Interpretation of Impedance Spectra of Large‐Format Lithium‐Ion Batteries and Its Application in Aging Studies

Cited by 31 publications

References 29 publications

A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si

A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si

Impedance Spectroscopic Investigation of the Impact of Erroneous Cell Assembly on the Aging of Lithium‐Ion Batteries

Quality‐Indicator‐Based Preprocessing for the Distribution of Relaxation Times Method

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