Effect of Impurity Profile on Cycling Behavior of LiFSI Electrolytes - (PPT)

摘要

Purity and impurity profiles of commercial samples of LiFSI vary significantly both from vendor to vendor and from lot to lot. Erratic behavior of AI clad coin cells was attributed to coating imperfections causing stainless steel exposure and corrosion. An impurity found in samples from vendor B and C possibly inhibits the metal corrosion, hence the electrolyte seems to perform better in coin cells format. Experiments using Al clad coin cells and LiFSI based electrolytes may provide inconsistent or misleading results depending on the source of the material. Al clad coin cells may not be the best format for LiFS! based electrolytes studies. Pouch cells are the preferred format to study LiFSI based electrolytes. Study of cycling behavior of LiFSI based electrolytes in pouch cells are in progress (1) Cycling life aging. (2) Calendar life aging. (3) Temperature dependent cycling performance. (4) Exploriation electrolyte additives to allow higher upper cutoff cycling voltage.