AI Article Synopsis
- Liquid-phase mass transport is crucial for the stability of lithium-ion batteries, but its mechanisms in separators are not fully understood due to complex internal environments during battery use.
- In-situ local electrochemical impedance spectroscopy was used to study the impacts of separator microstructure and electrolyte properties on mass transfer, revealing that reduced porosity leads to higher overpotentials.
- The research established relationships between separator geometry (porosity, tortuosity, thickness) and performance, noting that higher electrolyte viscosity increases resistance, which in turn affects polarization and overall battery performance, laying groundwork for more stable lithium-ion batteries.
Article Abstract
The liquid-phase mass transport is the key factor affecting battery stability. The influencing mechanism of liquid-phase mass transport in the separators is still not clear, the internal environment being a complex multi-field during the service life of lithium-ion batteries. The liquid-phase mass transport in the separators is related to the microstructure of the separator and the physicochemical properties of electrolytes. Here, in-situ local electrochemical impedance spectra were developed to investigate local inhomogeneities in the mass transfer process of lithium-ion batteries. The geometric microstructure of the separator significantly impacts the mass transfer process, with a reduction in porosity leading to increased overpotentials. A competitive relationship among porosity, tortuosity, and membrane thickness in the geometric parameters of the separator were established, resulting in a peak of polarization. The resistance of the liquid-phase mass transfer process is positively correlated with the viscosity of the electrolyte, hindering ion migration due to high viscosity. Polarization is closely related to the electrochemical performance, so a phase diagram of battery performance and inhomogeneous mass transfer was developed to guide the design of the battery. This study provides a foundation for the development of high stability lithium-ion batteries.
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| http://dx.doi.org/10.1002/cssc.202400963 | DOI Listing |
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