CORES Research Group

Plot showing discharge capacity as a function of C-rate in EOL NMC cathodes. Capacity drops off starting at about 1C, with EOL samples losing capacity more than pristine samples. For any given layer of the pouch cell, samples taken from the periphery have lower capacity than those taken from the center.

Plot showing degree of cracking for several samples taken from the EOL pouch cell. The layer periphery has the largest degree of cracking, which correlates with the observed capacity loss and impedance growth.

In this paper, Melissa collected samples from throughout end-of-life (EoL) pouch cells, finding spatial variation in degradation both between layers and within a given layer.

Namely, samples from layer edges showed more crack and more degradation than samples from layer centers.

Heterogeneity of the Dominant Causes of Performance Loss in End‐of‐Life Cathodes and Their Consequences for Direct Recycling Direct recyling of Li-ion battery materials promises a low-cost path towards a secure domestic supply of critical materials for batteries. Using cathode material from an end-of-life commercial Li-ion...

New #OpenAccess paper alert! M. Popeil (w/ @drdecaluwe.bsky.social, Donal Finnegan and many other wonderful collaborators) presents a study of degradation modes and spatial heterogeneity in end-of-life NMC cathode pouch cells, out now in Advanced Energy Materials.

#Battchat

An excel spreadsheet showing an R-C circuit and the so-called "Randle's Circuit" impedance data, on Nyquist plots, based on fundamental physical constants (exchange current density, capacitance, and diffusion coefficient).

This semester we are using our group meetings to dig in and gain better understanding of #EIS, deriving physics-based equivalent circuit model equations.

#Battchat

Predicting the Impact of Parameter Uncertainty on Model-Guided Li-O2 Cathode Design - IOPscienceSearch Predicting the Impact of Parameter Uncertainty on Model-Guided Li-O2 Cathode Design, Melodie Chen-Glasser, Steven C. DeCaluwe

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Meanwhile, M. Chen-Glasser published #OpenAccess in J. Electrochem. Soc: "Predicting the Impact of Parameter Uncertainty on Model-Guided Li-O2 Cathode Design"

Congrats, doctors Huey and Chen-Glasser

Mechanical and electrical changes in electrochemically active polyimide binders for Li-ion batteries Polyimide binders are often used in electrodes made with silicon for lithium-ion batteries for their mechanical strength and adhesion, which help mitigate mechanical issues associated with large volum...

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Z. Huey published "Mechanical and electrical changes in electrochemically active polyimide binders for Li-ion batteries" in J. Mat Chem A.

Catching up on a busy 2024 - we published a bit more than we posted 😁

To close out the year, the dynamic duo of Zoey Huey and Melodie Chen-Glasser each published the final papers of their PhD work!

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Using AFM-based resistivity measurements, Zoey shows how thermal curing of Si-PEO anodes induces phase segregation between the low-resistance carbon binder and the high-resistance Si active material, which benefits the electrodes' electrochemical and mechanical properties.

Impacts of Curing-Induced Phase Segregation in Silicon Nanoparticle-Based Electrodes We report the investigation of silicon nanoparticle composite anodes for Li-ion batteries, using a combination of two nm-scale atomic force microscopy-based techniques: scanning spreading resistance m...

New paper alert!

"Impacts of Curing-Induced Phase Segregation in Silicon Nanoparticle-Based Electrodes" by Zoey Huey is now published #OpenAccess in Batteries

doi.org/10.3390/batt...

Wednesday, 8/21, 2:55 pm, Room 502.
Irene Walker presents "Survey of ex-situ thermochemical mineralization approaches, operating conditions, and application to distinct tailings streams"

/fin

Monay, 8/19, 5:45 pm. Room 502
@drdecaluwe.bsky.social presents "Multi-reaction chemical modeling for pathways toward high-energy Li-sulfur batteries"

Monday, 8/19, 9 AM, room 505.


M. Popeil presents "Characterizing end-of-life NMC cathodes to understand heterogenity in degradation and inform reuse and recycling of Li-ion batteries"

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Come see members of CORES Research Group at #ACSfall2024

Sunday 8/18, 5:45 pm Bluebird 3G.
S. DeCaluwe Presents "Cantera: Open-source software for simulating complex thermo-chemistry"

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This morning, recent CORES Research graduate Zoey Huey presents her work on AFM characterization of silicon anodes to the Battery Modeling Webinar Series:

Zoom Link: umich.zoom.us/j/92716297489
Passcode: 957280

Battery modeling results. Lines go up, lines go down.

Now all is well ;)

Congratultations to the newly-minted Dr. Zoey Huey, who expertly defended her PhD thesis, today, on using AFM based techniques to characterize composite Silicon anodes.

🔋🎉

Cloud of words in various colors and sizes based on the Google Scholar profile for Steven DeCaluwe. Some of the largest words include solid oxide batteries electrochemical electrodes modeling cells ceria electrolyte interphase situ anodes microstructure nafion silicon battery characterization chemical fuel impacts kinetics mapping oxidation pemfc structure thin-film transport water xps active

Pretty good reflection of what we're all about:
🧪

In it, C. Randall looked at thin-film Nafion on carbon substrates to better understand Nafion structure in PEM fuel cell and hydrolyzed catalyst layers. We find structure can vary with substrate hydrophobicity & roughness, but the non-interfacial region is consistent across substrates.

New #OpenAccess paper alert!

"Morphology of Thin-Film Nafion on Carbon as an Analogue of Fuel Cell Catalyst Layers" now out in ACS Applied Material Interfaces.

doi.org/10.1021/acsa...

#BattChat 🔋