Mechanical Structuring of Lithium-Ion Battery Electrodes Using an Embossing Roller

Josef Keilhofer, Leon Wolfgang Ferdinand Schaffranka, Amy Wuttke, Florian Josef Günter, Lucas Hille, Filip Adam Dorau, Rüdiger Daub

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Highly performing lithium-ion batteries are essential for the electrification of the transport sector. However, the two performance criteria, high power density and high energy density, inversely correlate with each other via the mass loading of the electrodes. To achieve high charging and discharging rates at high energy densities, structuring of electrodes is a proven method. Currently, structures are mostly realized by laser ablation, which comes along with material loss and low process rates. Herein, a concept for electrode structuring through mechanical embossing in a high-throughput roll-to-roll process is elaborated. Different integration options are described and the challenges are discussed. To provide a proof of concept, a hand-operated embossing device is built and used to structure graphite anodes. In a rate capability test, an increase in discharge capacity at medium C-rates by up to 14.3% is observed.

Original languageEnglish
JournalEnergy Technology
DOIs
StateAccepted/In press - 2023

Keywords

  • electrode designs
  • electrode structuring
  • lithium-ion batteries
  • microembossing

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