Equivalent circuit definition and calendar aging analysis of commercial Li(NiMnCo)O2/graphite pouch cells

Beltrán, Héctor; Ayuso, Pablo; Vicente, Nuria; Beltrán-Pitarch, Braulio; Garcı́a-Cañadas, Jorge; Pérez, Emilio

doi:10.1016/j.est.2022.104747

Cited by 8 publications

(6 citation statements)

References 42 publications

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“…At the same time, variation in R ct differentiates significantly between PVDF and HSV 1810 samples – for all HSV 1810 samples, the R ct values are smaller, especially for NMP HSV 1810, suggesting more efficient electron transfer for HSV 1810 samples than for PVDF. The values are consistent with those previously published for NMC batteries [51–53] . Detailed results of modeling are provided in the supporting information (Table S1).…”

Section: Resultssupporting

confidence: 90%

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Various Solvent‐Binder Compositions and their Crystalline Phase for Optimal Screen‐Printing of NMC Cathodes

Sliz,

Roy,

Molaiyan

et al. 2024

Batteries & Supercaps

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This research examines the compatibility and performance of various solvents and binders in the battery cathode fabrication. The study focused on the applicability of solvents, including DMF, NMP, p‐Xylene, Ethanol, Toluene, Cyrene, and KJCMPA, in conjunction with binders such as PVDF #9300, PVDF #1100, HSV 1810, PVP, Oppanol N150, and Oppanol B15 for NMC‐based slurry formulation. Each solvent‐binder combination was evaluated with NMC material, and those demonstrating optimal solubility, adhesion, and film quality were selected for cathode screen‐printing trials. Results show that the combination of NMP solvent and HSV 1810 binder outperformed other pairings in cycling stability and capacity retention, achieving 87% capacity retention after 1,000 1C/1C cycles. Comprehensive analyses using SEM, XRD, and FTIR offered insights into the structural and binder phase characteristics of the fabricated cathodes, especially the alterations in binder crystallinity phases (α, β, and γ). The data suggest that the use of the homopolymer HSV 1810, irrespective of the solvent, results in a pronounced presence of the γ‐phase within the binder, which subsequently improves battery performance. Moreover, the findings underscore the importance of the solvent‐binder combinations in enhancing battery performance and longevity.

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Section: Resultssupporting

confidence: 90%

“…The values are consistent with those previously published for NMC batteries. [51][52][53] Detailed results of modeling are provided in the supporting information (Table S1). Table 4 displays the sheet resistance and conductivity of the printed NMC cathodes with different solvent-binder compositions.…”

Section: Resultsmentioning

confidence: 99%

Various Solvent‐Binder Compositions and their Crystalline Phase for Optimal Screen‐Printing of NMC Cathodes

Sliz,

Roy,

Molaiyan

et al. 2024

Batteries & Supercaps

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“…In a battery, calendar ageing occurs all the time but predominantly when the battery is idle, that is when the vehicle is parked and there is no flow of current through the LIBs (Beltran et al 2022). The rate of battery degradation due to calendar ageing shows a very steady trend (Sui et al 2021), wherein the rate of increase in capacity fade and internal resistance gradually subsides as the ageing advances.…”

Section: Calendar Ageingmentioning

confidence: 99%

Real-world Electric Bus Operation: Trend in Technology, Performance, Degradation, and Lifespan of Batteries

Kumar,

Mulukutla,

Doshi

2024

WRIPUB

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The working paper, identifies specific battery technologies that are preferred for powering e-buses in different geographical locations across the world and assesses their performance under different environmental conditions. The paper studies how different stress factors contribute to the ageing of batteries and their overall impact on the automotive life of e-bus batteries. It also provides insights on how battery degradation, can affect the battery and consequently the performance of an e-bus performance in the near term, and the battery life and economic viability of an e-bus in the long term. The analysis is followed by a series of recommendations to adopt best practices, improve planning, and devise policy, which will be instrumental in improving battery lifespan in countries like India, which are planning for large-scale adoption of e-buses for public transport. The working paper is supported by the Transformative Urban Mobility Initiative (TUMI), a leading global implementation initiative on sustainable mobility. The TUMI E-Bus Mission, supported by the Federal Ministry for Economic Cooperation and Development (BMZ), is working in 20 deep-dive cities to advance electric bus adoption across leading cities in the Global South. In India, the Mission is focused on Delhi, Mumbai, Bengaluru and Ahmedabad.

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“…In this regard, electrochemical impedance spectroscopy (EIS) [3,[5][6][7][8][9] is a powerful non-invasive tool for lithium-ion battery characterization, providing a large amount of information discretized on a characteristic time scale and collected within a limited testing timespan. These advantages make it a promising tool for state-of-charge and state-of-health estimation [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…This complexity forces researchers to use models. EIS is usually modelled through equivalent circuit models (ECM) [3,6,7,10,11] of very miscellaneous complexity (within the literature), where relevant processes are associated with a combination of pure resistances…”

Section: Introductionmentioning

confidence: 99%

Reliable Thermal-Physical Modeling of Lithium-Ion Batteries: Consistency between High-Frequency Impedance and Ion Transport

2023

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Among lithium-ion battery diagnostic tests, electrochemical impedance spectroscopy, being highly informative on the physics of battery operation within limited testing times, deserves a prominent role in the identification of model parameters and the interpretation of battery state. Nevertheless, a reliable physical simulation and interpretation of battery impedance spectra is still to be addressed, due to its intrinsic complexity. An improved methodology for the calibration of a state-of-the-art physical model is hereby presented, focusing on high-energy batteries, which themselves require a careful focus on the high-frequency resistance of the impedance response. In this work, the common assumption of the infinite conductivity of the current collectors is questioned, presenting an improved methodology for simulating the pure resistance of the cell. This enables us to assign the proper contribution value to current collectors’ resistance and, in turn, not to underestimate electrolyte conductivity, thereby preserving the physical relation between electrolyte conductivity and diffusivity and avoiding physical inconsistencies between impedance spectra and charge–discharge curves. The methodology is applied to the calibration of the model on a commercial sample, demonstrating the reliability and physical consistency of the solution with a set of discharge curves, EIS, and a dynamic driving cycle under a wide range of operating conditions.

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Equivalent circuit definition and calendar aging analysis of commercial Li(NiMnCo)O2/graphite pouch cells

Cited by 8 publications

References 42 publications

Various Solvent‐Binder Compositions and their Crystalline Phase for Optimal Screen‐Printing of NMC Cathodes

Various Solvent‐Binder Compositions and their Crystalline Phase for Optimal Screen‐Printing of NMC Cathodes

Real-world Electric Bus Operation: Trend in Technology, Performance, Degradation, and Lifespan of Batteries

Reliable Thermal-Physical Modeling of Lithium-Ion Batteries: Consistency between High-Frequency Impedance and Ion Transport

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