Link to full paper: https://www.researchgate.net/publication/370805319_Improving_Lithium-ion_Cells_by_Replacing_Polyethylene_Terephthalate_Jellyroll_Tape https:

Link to full paper: https://www.researchgate.net/publication/370805319_Improving_Lithium-ion_Cells_by_Replacing_Polyethylene_Terephthalate_Jellyroll_Tape https://www.researchgate.net/publication/370805319_Improving... Interesting stuff. It seems like some battery vendors don't use PET tape in their construction? In that case, I'm surprised that competitive analysis on the part of PET tape using vendors didn't result in this being a known issue ages ago. Also, judging from the pictures, it looks like the tape degradation is really obvious. Again, surprising that battery manufacturers didn't open up their own batteries after aging / cycling tests and notice that.