Researchers reveal the role of 'lithium creep' in batteries

https://techxplore.com/news/2023-01-reveal-role-lithium-batteries.html

"Li metal is soft and deforms easily under pressure, which degrades separator within pouch cell... separator helps prevent short circuit which can result in battery failure and fire...  current commercial separators are not mechanically compatible with the next generation of high-energy density batteries, and novel battery separators should be developed to meet the new mechanical requirements"