Understanding and controlling lithium morphology in solid polymer and gel polymer systems: mechanisms, strategies, and gaps

Owensby, Kyra D.; Sahore, Ritu; Tsai, Wan-Yu; Chen, X. Chelsea

doi:10.1039/d3ma00274h

Cited by 2 publications

(1 citation statement)

References 87 publications

(191 reference statements)

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“…One potential approach to resolve these safety concerns is to use polymer electrolytes, which are significantly less flammable and less prone to leakage . However, common polymer electrolytes often suffer from low ionic conductivity, which increases concentration gradients during current flow and thereby limits their rate performance, and increases the risk of failure. − …”

Section: Introductionmentioning

confidence: 99%

Percolating Interfacial Layers Enhance Conductivity in Polymer–Composite Electrolytes

Ock,

Bhattacharya,

Wang

et al. 2024

Macromolecules

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This study investigates the impact of the ceramic particle size on the bulk and interfacial ion transport properties of composite polymer electrolytes. The ceramic particles used for this study are micrometer-sized commercial lithium lanthanum titanate (LLTO) powders and LLTO nanorods (NR) prepared in the laboratory. The polymer matrices are vinylene carbonate (VEC) based single-ionconducting (SIC) and dual-ion-conducting (DIC) polymer electrolytes. Our results reveal that the addition of LLTO NR results in improved ion transport, while the addition of commercial LLTO is ineffective or even detrimental. We ascribe these results to the formation of an interfacial polymer layer around the LLTO particles with enhanced Li + mobility and estimate the thickness of the interfacial layer to be ∼5 nm. The high surface-to-volume ratio of the LLTO NR leads to the percolation of the interfacial region at a relatively low ceramic loading of 30 wt %. This study highlights the importance of achieving percolation of the interface region (as opposed to the particles themselves) within the composite electrolyte when the interfacial layer is the enhancement mechanism.

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Section: Introductionmentioning

confidence: 99%

Percolating Interfacial Layers Enhance Conductivity in Polymer–Composite Electrolytes

Ock,

Bhattacharya,

Wang

et al. 2024

Macromolecules

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show abstract

The Impact of Lithium Anode Interface on Capacity Fade in Polymer Electrolyte-Based Solid-State Batteries

Owensby,

Ock,

Sahore

et al. 2024

ACS Appl. Energy Mater.

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This study investigates the Li stripping-plating morphology and failure mechanisms in full cells consisting of a solid polymer electrolyte (SPE) with two commercial Li anodes: Li chip and Li foil. The primary identified failure mechanism of the SPE cell is capacity fade, regardless of the Li manufacturer. While the cathode's role in capacity fade is evident, the Li anode significantly influences cycling performance, with Li foil cells cycling 50% longer than Li chip cells, a statistical difference. Post-mortem scanning electron microscopy and X-ray photoelectron spectroscopy results attribute the Li chip's faster capacity fade to a loss of contact and continuous growth of the solid electrolyte interphase (SEI). Conversely, Li foil maintains consistent contact with the solid polymer, displaying a thin and stable SEI. Additionally, failure mechanisms between a gel electrolyte in previous work and the dry SPE are compared.

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Understanding and controlling lithium morphology in solid polymer and gel polymer systems: mechanisms, strategies, and gaps

Abstract: Lithium metal anode promises the highest theoretical energy density and may enable high energy designs such as lithium-sulfur and lithium-air batteries. However, stable lithium plating and stripping remains a challenge...

Cited by 2 publications

References 87 publications

Percolating Interfacial Layers Enhance Conductivity in Polymer–Composite Electrolytes

Percolating Interfacial Layers Enhance Conductivity in Polymer–Composite Electrolytes

The Impact of Lithium Anode Interface on Capacity Fade in Polymer Electrolyte-Based Solid-State Batteries

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