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Silicon-Based Graphite Electrode Materials–Impact of Electrode Architecture on Electrochemical Performance and Cell Degradation

Pfleging, Wilhelm ORCID iD icon; Zheng, Yijing


Graphite is commonly used as anode material in commercial lithium-ion-batteries (LIBs). Due to the demand for a significantly increased energy density for electrical vehicles, there is worldwide a strong effort in research and development to add silicon nano-particles to composite electrodes. Pure silicon has the benefit to enable almost one order of magnitude higher gravimetrical energy densities than graphite. Due to a huge volume expansion of silicon of about 300 % during electrochemical cycling it is so far most promising for commercialization to use silicon/graphite composites, instead of pure silicon. However, for silicon/graphite electrodes, the volume expansion during lithiation is still a problem regarding an enhanced cell degradation. Thick film electrodes are further concept to enable increased energy densities on cell level by avoiding inactive cell components namely separator and current collector materials. Due to limitations in diffusion kinetics in thick film electrodes and an increased diffusion overpotential at high charging/discharging currents, a significant drop in power density is observed. Material processing using ultrafast laser radiation provides now an exceptional approach to overcome power and lifetime limitations of thick-film and silicon/graphite electrodes. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Publikationsdatum 16.11.2021
Sprache Englisch
Identifikator KITopen-ID: 1000141204
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Veranstaltung International Conference on Carbon Chemistry and Materials (2021), Online, 15.11.2021 – 17.11.2021
Projektinformation DFG, DFG EIN, PF 392/9-1
Next-Gen-3DBat (BMBF, EU 6. RP, 03XP0198F)
Bemerkung zur Veröffentlichung Program:

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