Enhanced mechanical energy absorption via localized viscoplasticity of nano-cellular polymer coating under supersonic impact loading

Ren, Zongling; Green-Warren, Robert; McAllister, Noah; Kim, Ara; Shaikh, Asaad; Pelegri, Assimina A.; Singer, Jonathan P.; Lee, Jae‐Hwang

doi:10.1016/j.giant.2023.100180

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…Electrospray System: The electrospray system utilized in this study is identical to that used in previous studies on SLED in ambient environments. 13,15,16,18,32 Please see references for details.…”

Section: Experimental Section/methodsmentioning

confidence: 99%

“…13,15,16 Glassy polymer-solvent blends, addition of inorganic constituents, and the input spray parameters can be selectively manipulated to produce coatings with tailored mechanical properties, film porosity, and functionality. 17,18,11 When evaluating established methods on separator fabrication, SLED is most comparable to electrospinning, another regime within ESD where solid loading of the polymer can be in the range of 5-60 wt.%; whereas, polymer concentration for SLED is commonly 1-5 wt.%. 15,19 SLED offers many of the advantages of electrospinning, such as compositing and manipulation of feature sizes, but maintains superior control of pore volume, size, and geometry.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-Limiting Electrospray Deposition (SLED) of Porous Polyimide Coatings as Effective Lithium-Ion Battery Separator Membranes

Green-Warren,

Fassler,

Juhl

et al. 2024

Preprint

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Electrospray deposition (ESD) is employed to produce separator membranes for coin-cell lithium-ion batteries (LIBs) using off-the-shelf polyimide (PI). The PI coatings are deposited directly onto planar NMC electrodes via self-limiting electrospray deposition (SLED). Scanning electron microscopy (SEM), optical microscopy, and spectroscopic microreflectometry are implemented in combination to evaluate the porosity, thickness, and morphology of sprayed PI films. Electrochemical performance of the PI separators are analyzed via charge/discharge cycle rate tests. Discharge capacities of cells with the unoptimized SLED PI separators are within 83-99.8% of those with commercial Celgard 2325 PP/PE/PP separators. Furthermore, ultraviolet-visual wavelength spectroscopy (UV-vis) is utilized to qualitatively assess variation in film porosity within a prescribed temperature range of 20-400oC. UV-vis results underscore the ability of the SLED PI separator to maintain its porous microstructure up to ~350oC. This study points to the unique possibility of SLED as a separator manufacturing technique for geometrically complex energy storage systems. Further research is needed to optimize the polymer-solvent system to enhance control of porosity, pore size, and coating thickness. This can lead to significant improvement in rate and cycle life performance in more advanced energy storage devices.

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Section: Experimental Section/methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Limiting Electrospray Deposition (SLED) of Porous Polyimide Coatings as Effective Lithium-Ion Battery Separator Membranes

Green-Warren,

Fassler,

Juhl

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Viscoelastic Properties of Electrospray‐Deposited Polymer Shells via Quartz Crystal Microbalance With Dissipation (QCM‐D)

Green‐Warren,

McAllister,

Pasupathy

et al. 2024

Macro Materials & Eng

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Multilayer polymer films are extensively used in multiphase separation. Electrospray deposition (ESD) is an important technique for fabricating such films with tunable morphology. Viscoelastic properties of polystyrene (PS) nanoshell coatings produced by ESD on gold and spin‐coated PS surfaces are evaluated using Quartz Crystal Microbalance with Dissipation (QCM‐D). The thickness of PS films on gold increases with flow rate from ∼200 nm at 0.5 to ∼400 nm at 1.5 mL h−1, accompanied by an order‐of‐magnitude increase in dissipation due to larger particle sizes from shorter droplet flight times. This effect is absent on spin–coated PS films, suggesting the onset of the self‐limiting effect of charges. Although the shear moduli for ESD films calculated from Voigt models is only 0.08%–0.20% of the bulk PS modulus, the stiffness ratio of spray‐coated PS to a single shell is (5.00–13.3) × 103 m−1, due to shell–shell and shell–substrate interactions. These are novel results related to the interparticle friction obtained using QCM‐D for the first time. This work demonstrates that mechanical properties of particulate viscoelastic films with potential applications in high surface area sensors, such as size‐selective membranes for protein or electrolyte adsorption, can be evalauted by QCM‐D with nanograms of material.

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Self-limiting electrospray deposition (SLED) of porous polyimide coatings as effective lithium-ion battery separator membranes

Green-Warren,

Fassler,

Juhl

et al. 2024

RSC Appl. Polym.

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Enhanced mechanical energy absorption via localized viscoplasticity of nano-cellular polymer coating under supersonic impact loading

Cited by 3 publications

References 33 publications

Self-Limiting Electrospray Deposition (SLED) of Porous Polyimide Coatings as Effective Lithium-Ion Battery Separator Membranes

Self-Limiting Electrospray Deposition (SLED) of Porous Polyimide Coatings as Effective Lithium-Ion Battery Separator Membranes

Viscoelastic Properties of Electrospray‐Deposited Polymer Shells via Quartz Crystal Microbalance With Dissipation (QCM‐D)

Self-limiting electrospray deposition (SLED) of porous polyimide coatings as effective lithium-ion battery separator membranes

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