Increase of Cycling Stability in Pilot-Scale 21700 Format Li-Ion Cells by Foil Tab Design

Processes

Thomas Waldmann¹  Daniel Brändle¹  Rares-George Scurtu¹  Margret Wohlfahrt-Mehrens¹ 

[1] ZSW—Zentrum für Sonnenenergie-und Wasserstoff-Forschung Baden-Württemberg, Helmholtzstrasse 8, D-89081 Ulm, Germany;

关键词: lithium-ion battery;    21700 format;    cell design;    cell production;    tab design;   

DOI  :  10.3390/pr9111908

来源: DOAJ

【 摘 要 】

Li-ion cells of the industrially-relevant 21700 format were built on pilot-scale with tabs made from (a) the electrodes’ current collecting foils (Al and Cu, “foil tabs”) in comparison with (b) conventional tabs (Al and Ni) welded to the electrodes’ current collecting foils (“welded tabs”). Both cell types use the same anode (graphite), cathode (NMC622), separator, electrolyte, as well as the same tab positions. This allows a direct comparison of welded tabs and foil tabs regarding formation, C-rate capability, cell electrical resistance, and long-term cycling stability tests. Our data reproducibly shows 14.4% longer cycling stability and 11.2% increased total charge throughput in the case of the cells with foil tabs until 80% SOH, which is likely due to less inhomogeneities in the case of the foil tab design.

【 授权许可】

Unknown