Marie-Francine Lagadec


Last Name

Lagadec

First Name

Marie-Francine

ORCID

0000-0002-6214-5171

Organisational unit

02291 - NCCR Catalysis / NCCR Catalysis

Filters

2012 - 2019102020 - 20233
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Publications 1 - 10 of 13
  • Designing Polyolefin Separators to Minimize the Impact of Local Compressive Stresses on Lithium Ion Battery Performance
    Item type: Journal Article
    Lagadec, Marie-Francine; Zahn, Raphael; Wood, Vanessa (2018)
    Journal of the Electrochemical Society
  • Electronic Transport in Porphyrin Supermolecule-Gold Nanoparticle Assemblies
    Item type: Journal Article
    Conklin, David; Nanayakkara, Sanjini; Park, Tae-Hong; et al. (2012)
    Nano Letters
  • Topological and network analysis of lithium ion battery components: the importance of pore space connectivity for cell operation
    Item type: Journal Article
    Lagadec, Marie-Francine; Zahn, Raphael; Müller, Simon; et al. (2018)
    Energy & Environmental Science
    The structure of lithium ion battery components, such as electrodes and separators, are commonly characterised in terms of their porosity and tortuosity. The ratio of these values gives the effective transport coefficient of lithium ions in the electrolyte-filled pore spaces, which can be used to determine the ionic resistivity and corresponding voltage losses. Here, we show that these microstructural characteristics are not sufficient. Analysis of tomographic data of commercial separators reveals that different polyolefin separators have similar porosity and through-plane tortuosity, which, in the homogenised picture of lithium ion cell operation, would imply that these different separators exhibit similar performance. However, numerical diffusion simulations indicate that this is not the case. We demonstrate that the extent to which lithium ion concentration gradients are induced or smoothed by the separator structure is linked to pore space connectivity, a parameter that can be determined by topological or network based analysis of separators. These findings enable us to propose how to design separator microstructures that are safer and accommodate fast charge and discharge.
  • Communication ‒ Technique for Visualization and Quantification of Lithium-Ion Battery Separator Microstructure
    Item type: Journal Article
    Lagadec, Marie-Francine; Ebner, Martin; Zahn, Raphael; et al. (2016)
    Journal of the Electrochemical Society
    Separators play an important role in lithium-ion battery operation; however, no comprehensive studies of their microstructure and its impact exist. To enable such studies, we present a simple method for separator microstructure visualization and quantification based on focused-ion-beam scanning electron microscopic tomography. Here, we use this approach to visualize a sample of commercial polyethylene separator, calculate its directional effective transport parameters, and explain the impact of these values on battery performance. We further extend this technique to visualize metallic deposition within the separator, which could facilitate the study of lithium plating and dendritic growth.
  • Characterization and performance evaluation of lithium-ion battery separators
    Item type: Review Article
    Lagadec, Marie-Francine; Zahn, Raphael; Wood, Vanessa (2019)
    Nature Energy
    Lithium-ion batteries (LIBs) with liquid electrolytes and microporous polyolefin separator membranes are ubiquitous. Though not necessarily an active component in a cell, the separator plays a key role in ion transport and influences rate performance, cell life and safety. As our understanding of separator properties and the interactions between the separator and the electrolyte deepens, it becomes evident that there are opportunities for improving separators to help meet the greater demands that new applications place on LIB technology. Here, we review the impact of the separator structure and chemistry on LIB performance, assess characterization techniques relevant for understanding structure–performance relationships in separator membranes, and provide an outlook on next-generation separator technology. Insights from this Review indicate that LIB performance can be improved by taking into account the interplay of the separator with its surroundings and indicate that, in the future, separators will be designed to play a more active role in LIB operation. Current and emerging characterization techniques will play an important role in guiding this evolution in separator technology.
  • Characterisation and Topology-Based Design of Lithium Ion Battery Separators
    Item type: Doctoral Thesis
    Lagadec, Marie-Francine (2018)
  • Transport in Lithium Ion Batteries: Reconciling Impedance and Structural Analysis
    Item type: Journal Article
    Zahn, Raphael; Lagadec, Marie-Francine; Wood, Vanessa (2017)
    ACS Energy Letters
  • Exploiting Plasmon-Induced Hot Electrons in Molecular Electronic Devices
    Item type: Journal Article
    Conklin, David; Nanayakkara, Sanjini; Park, Tae-Hong; et al. (2013)
    ACS Nano
  • Swiss Summer School 2021: Catalysis and Sustainable Chemistry
    Item type: Other Journal Item
    Lüthi, Hans P.; Lagadec, Marie-Francine; Gamp, Lauren; et al. (2021)
    Chimia
  • NCCR Catalysis - Sustainable production of chemicals
    Item type: Other Journal Item
    Pérez-Ramírez, Javier; Waser, Jérôme; Lagadec, Marie-Francine; et al. (2023)
    Chimia
Publications 1 - 10 of 13