Electrode microstructure controls localized electronic impedance in Li-ion batteries

Vogel, John E; Forouzan, Mehdi M.; Hardy, Emilee; Crawford, Sean T.; Wheeler, Dean R.; Mazzeo, Brian A.

doi:10.1016/j.electacta.2018.11.204

Cited by 37 publications

(31 citation statements)

References 32 publications

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“…Furthermore, the severe microstructure collapse of the surface particles during the calendering process could initiate local deviations during long‐term cycling. [ 9–13 ]…”

Section: Figurementioning

confidence: 99%

Boosting Reaction Homogeneity in High‐Energy Lithium‐Ion Battery Cathode Materials

et al. 2020

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Conventional nickel‐rich cathode materials suffer from reaction heterogeneity during electrochemical cycling particularly at high temperature, because of their polycrystalline properties and secondary particle morphology. Despite intensive research on the morphological evolution of polycrystalline nickel‐rich materials, its practical investigation at the electrode and cell levels is still rarely discussed. Herein, an intrinsic limitation of polycrystalline nickel‐rich cathode materials in high‐energy full‐cells is discovered under industrial electrode‐fabrication conditions. Owing to their highly unstable chemo‐mechanical properties, even after the first cycle, nickel‐rich materials are degraded in the longitudinal direction of the high‐energy electrode. This inhomogeneous degradation behavior of nickel‐rich materials at the electrode level originates from the overutilization of active materials on the surface side, causing a severe non‐uniform potential distribution during long‐term cycling. In addition, this phenomenon continuously lowers the reversibility of lithium ions. Consequently, considering the degradation of polycrystalline nickel‐rich materials, this study suggests the adoption of a robust single‐crystalline LiNi0.8Co0.1Mn0.1O2 as a feasible alternative, to effectively suppress the localized overutilization of active materials. Such an adoption can stabilize the electrochemical performance of high‐energy lithium‐ion cells, in which superior capacity retention above ≈80% after 1000 cycles at 45 °C is demonstrated.

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“…Furthermore, the severe microstructure collapse of the surface particles during the calendering process could initiate local deviations during long‐term cycling. [ 9–13 ]…”

Section: Figurementioning

confidence: 99%

Boosting Reaction Homogeneity in High‐Energy Lithium‐Ion Battery Cathode Materials

et al. 2020

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“…On top of the current collector is the coating layer composed of large active material particles, carbon additive for better conductivity, polymeric binder, and pores [10]. The distribution of this mixture of materials can vary significantly in structure due to manufacturing differences, thus causing the heterogeneity on the micron as well as on the millimeter-scale [9], [11].…”

Section: Battery Film Structurementioning

confidence: 99%

“…Our ZGV measurement has a resolution at 0. [45]. The measured area can be assumed to be an infinite plane until its position near the edge of the clamp boundary is on the same order as the ZGV mode wavelength.…”

Section: Young's Modulus Estimation Of Battery Coatingmentioning

confidence: 99%

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

Yao

Cassler

Wheeler

et al. 2019

Journal of Applied Physics

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The mechanical properties of thin-film Li-ion battery electrodes are controlled by the micro structure of the constituent materials. In this work, a non-contact and non-destructive measurement of the mechanical properties of electrode films is performed by measurement of zerogroup velocity (ZGV) resonances. The ZGV Lamb wave modes of a solid bilayer consisting of a thin metallic layer and a thin compliant coating layer are shown to be dependent on the Young's moduli, thicknesses, densities and Poisson ratios of the layers. Theoretical models are used to quantify the sensitivity of the ZGV resonances to changes in mechanical properties. Experimental ZGV resonances are excited using a pulsed infrared laser and detected using a laser interferometer. Commercial-grade battery films with different coating materials, densities and thicknesses are measured. Young's moduli of the battery electrode layers are estimated using the combination of a theoretical model and experimental results. The effect of the calendering process on the battery materials is also investigated. Results suggest that the Young's modulus of the electrode coating increases drastically after the battery films are calendered. This technique can be used to quantitatively study the mechanical properties of Li-ion battery electrodes to improve overall battery performance.

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“…This concept applies, in principle, to both laboratory‐scale manufacturing as well as pilot‐scale production. Within this basic process chain, there are multiple options to enhance the electrode performance using advanced process strategies and formulation procedures . This contribution focuses on grinding, mixing, dispersing, and keeping standardized parameters for the subsequent electrode processing constant.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Processing and Testing Concepts for New Active Materials for Lithium‐Ion Batteries

et al. 2019

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Electrode manufacturing requires multiple process steps, e.g., dispersing and coating. In‐between these steps, intermediate products have to be transferred, stored, and handled. Especially for the development of new active materials or electrode formulations, the variety of parameters that need to be screened is enormous. In addition, these materials are initially tested in small batches, and it is not always possible to upscale the used processes. To evaluate the performance of different materials or differently processed materials, test cells are assembled. This usually requires manual work procedures, which are inherently sensitive to variations and untraceable errors. If the stochastic flaws are large enough, the effects of process variations are covered by these. It is therefore important to increase reproducibility in all process steps. Herein, new concepts for electrode production and automated sample preparation for highly reproducible production and more effective electrode development and screening of parameters are presented. A combined grinding and dispersion process for the production of silicon‐based anodes and an automated assembly system for efficient testing is presented. The processes are supported by methods of data mining to collect process data, ensure high reproducibility, and support research on new active materials.

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Electrode microstructure controls localized electronic impedance in Li-ion batteries

Cited by 37 publications

References 32 publications

Boosting Reaction Homogeneity in High‐Energy Lithium‐Ion Battery Cathode Materials

Boosting Reaction Homogeneity in High‐Energy Lithium‐Ion Battery Cathode Materials

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

Enhanced Processing and Testing Concepts for New Active Materials for Lithium‐Ion Batteries

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