Improving Lithium-Ion Batteries By Replacing Polyethylene Terephthalate Jellyroll Tape

• DOI: 10.1149/ma2023-022341mtgabs
• Publication Date: 2024-02-08T19:12:34Z
• Authors: Anu Adamson; Tom Bötticher; Kenneth Tuul; Matthew D. L. Garayt; Saad Azam; Michael Metzger

Every lithium-ion battery cell produced today that is either wound or stacked contains tape. This tape serves the mechanical purpose of holding together jellyroll electrodes before inserting it into casing, after which no purpose. Battery manufacturers often test inactive parts for their physical parameters, i.e., elongation, water absorption, and temperature resistance. 1 However, chemical stability overlooked. Recently, was demonstrated polyethylene terephthalate (PET) can partially dissolve in harsh chemistry its monomer dimethyl (DMT). molecule act as an unwanted redox shuttle LFP/graphite NMC811/graphite cells, inducing self-discharge battery. 2 Figure shows Fourier-transform infrared (FTIR) spectra tapes obtained from discarded cellphone batteries. Many well-known producers use PET products. In addition, FTIR show cells have been cycled, surface layer these severely corroded. study will open circuit storage, Ultra-High Precision Coulometry, long-term cycling results with The also how swapping a more stable alternative significantly improve performance reduce pouch cells. caption: . closing (a) extracted batteries (b). References: E. Foreman et al., Adv. Sustainable Syst. , 1, 1700061 (2017). S. Buechele J. Electrochem. Soc. 170, 010511 (2023).