Details

Autor(en) / Beteiligte

• Müller, Simon
• Pietsch, Patrick
• Brandt, Ben-Elias
• Baade, Paul
• De Andrade, Vincent
• De Carlo, Francesco
• Wood, Vanessa

Titel

Quantification and modeling of mechanical degradation in lithium-ion batteries based on nanoscale imaging

Ist Teil von

• Nature communications, 2018-06, Vol.9 (1), p.2340-8, Article 2340

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2018

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• Capacity fade in lithium-ion battery electrodes can result from a degradation mechanism in which the carbon black-binder network detaches from the active material. Here we present two approaches to visualize and quantify this detachment and use the experimental results to develop and validate a model that considers how the active particle size, the viscoelastic parameters of the composite electrode, the adhesion between the active particle and the carbon black-binder domain, and the solid electrolyte interphase growth rate impact detachment and capacity fade. Using carbon-silicon composite electrodes as a model system, we demonstrate X-ray nano-tomography and backscatter scanning electron microscopy with sufficient resolution and contrast to segment the pore space, active particles, and carbon black-binder domain and quantify delamination as a function of cycle number. The validated model is further used to discuss how detachment and capacity fade in high-capacity materials can be minimized through materials engineering. Silicon is a promising electrode material for lithium-ion batteries; however, morphological changes shorten battery lifetimes. Here the authors use imaging techniques based on electrons and X-rays to quantify such processes at micro- and nanoscales and suggest routes to mitigate battery degradation.