Measuring microscale mechanical properties of PVdF binder phase and the binder-particle interface using micromechanical testing

Iyer, Anand Harihara Subramonia; Gupta, Priyank; Gudmundson, Peter; Kulachenko, Artem

doi:10.1016/j.msea.2023.145352

Cited by 9 publications

(1 citation statement)

References 54 publications

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“…As our study focuses only on the earliest stage of the battery lifetime, it is likely the layer-level modulus will change significantly for a higher number of cycles where considerable particle cracking is expected. Microscale testing techniques can be employed to evaluate the individual mechanical properties of the electrode components to explain the changes in macroscopic properties [63]. A drawback of the U-shape bending technique is that only the average macro-mechanical properties can be calculated.…”

Section: Discussionmentioning

confidence: 99%

Layer-Resolved Mechanical Degradation of a Ni-Rich Positive Electrode

Gupta,

Streb,

Siddiqui

et al. 2023

Batteries

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The effects of electrochemical aging on the mechanical properties of electrodes in lithium-ion batteries are challenging to measure and are largely unknown. Mechanochemical degradation processes occur at different scales within an electrode and understanding the correlation between the degradation of mechanical properties, electrochemical aging, and morphological changes is crucial for mitigating battery performance degradation. This paper explores the evolution of mechanical and electrochemical properties at the layer level in a Ni-rich positive electrode during the initial stages of electrochemical cycling. The investigation involves complementary cross-section analyses aimed at unraveling the connection between observed changes on both macroscopic and microscopic scales. The macroscopic constitutive properties were assessed using a U-shaped bending test method that had been previously developed. The compressive modulus exhibited substantial dependency on both the porous structure and binder properties. It experienced a notable reduction with electrolyte wetting but demonstrated an increase with cycling and aging. During the initial stages of aging, electrochemical impedance spectra revealed increased local resistance near the particle–electrolyte interface. This is likely attributable to factors such as secondary particle grain separation and the redistribution of carbon black. The swelling of particles, compression of the binder phase, and enhanced particle contact were identified as probable factors adding to the elevation of the elastic modulus within the porous layer as a result of cycling.

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Section: Discussionmentioning

confidence: 99%

Layer-Resolved Mechanical Degradation of a Ni-Rich Positive Electrode

Gupta,

Streb,

Siddiqui

et al. 2023

Batteries

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Study of Microstructural Evolution and Strain Analysis in SiOx/C Negative Electrodes Using In‐situ X‐ray Tomography and Digital Volume Correlation

Valisammagari,

Lachambre,

Adrien

et al. 2024

Batteries & Supercaps

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Increasing the silicon content in batteries is expected to enhance their capacity. However, its implementation comes with challenges, as silicon exhibits a large volumetric expansion. This is a significant factor contributing to the decreased lifespan of these batteries, one of the critical degradation mechanisms from a mechanical perspective is the delamination of electrode structure. The cyclability of these anodes is noted to be influenced by the interaction between the binder and particles during battery cycling. The heavy local strain experienced by particles in these electrodes often leads to binder failure, resulting in particle detachment, or delamination over multiple cycles. A good understanding of the local evolution of the strain is essential in advancing the mechanical modelling of the degradation mechanism and in realizing the complete potential of silicon‐based electrodes. In this work, in situ global and local strain measurements were performed by combining synchrotron tomography with Digital volume correlation (DVC). The measurements showed that there is significant local strain in these electrodes which can lead to delamination. In addition to this, the spatial variability of the composite electrodes was characterized by estimating the characteristic length to strain, which can be used to replicate the strain field and model the delamination.

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Evaluation of the Corrosion Inhibition Capability of Mild Steel Coated with a ZnO-Ni/PVDF Nanocomposite in a Simulated Concrete Pore Solution: An Electrochemical Investigation and Numerical Simulation

Suhas,

Shanmugapriya

2024

Arab J Sci Eng

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Measuring microscale mechanical properties of PVdF binder phase and the binder-particle interface using micromechanical testing

Cited by 9 publications

References 54 publications

Layer-Resolved Mechanical Degradation of a Ni-Rich Positive Electrode

Layer-Resolved Mechanical Degradation of a Ni-Rich Positive Electrode

Study of Microstructural Evolution and Strain Analysis in SiOx/C Negative Electrodes Using In‐situ X‐ray Tomography and Digital Volume Correlation

Evaluation of the Corrosion Inhibition Capability of Mild Steel Coated with a ZnO-Ni/PVDF Nanocomposite in a Simulated Concrete Pore Solution: An Electrochemical Investigation and Numerical Simulation

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