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Recent progress in ultrafast laser structuring of advanced silicon/graphite thick film anodes for Li-ion-cells

Meyer, Alexandra; Zhu, Penghui; Seifert, Hans Jürgen; Pfleging, Wilhelm

Abstract:
Lithium-ion batteries already play an important role in providing electrical energy, and the need for advanced Li-ion cells will continue to grow. Thus, the continuous engineering improvement and material development related to the already existing Li-ion cell concept will be essential.

To increase the energy density on cell level, new materials for anodes and cathodes have to be developed. On anode-side, silicon is a promising material to partly or completely replace the commonly used graphite in SoA Li-ion cells. At full lithiation, the specific capacity of silicon and graphite are 3579 mAh/g and 372 mAh/g, respectively, so an almost one magnitude higher areal energy density on anode side might be possible. However, since silicon undergoes a huge volume change of up to 300 % during cycling, the usage of silicon as anode material is still quite a challenge.

In this work, laser structuring is used to compensate the volume change of silicon during electrochemical cycling and to reduce diffusion overpotential at elevated C-rates. The amount of material which is removed during ultrafast laser ablation has to be kept at a minimum, while the channel width still needs to be large enough to compensate the volume change. ... mehr



Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Publikationsdatum 22.09.2020
Sprache Englisch
Identifikator KITopen-ID: 1000126097
HGF-Programm 37.01.02 (POF III, LK 01)
Components and Cells
Veranstaltung Materials Science and Engineering Congress (MSE 2020), online, 22.09.2020 – 25.09.2020
Projektinformation Next-Gen-3DBat (BMBF, 03XP0198F)
Bemerkung zur Veröffentlichung Symposium F01: Advanced Materials for Lithium and Post-Lithium Batteries



Die Veranstaltung fand wegen der Corona-Pandemie als Online-Event statt.
Externe Relationen Abstract/Volltext
Schlagwörter silicon/graphite anode, ultrafast laser structuring, 3D battery, thick film electrodes
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