D. Mourzagh, S. Jouanneau, F. Rouillon, H. Rouault, M. Chapuis, S. Patoux, M-D. Braida, O. Buisine, C. Mercier, C. Hamon
pp. 25 - 28
Keywords: coated separator, Li-ion batteries, soft pouch cells
In order to reduce the duration of the electrolyte filling step, a new concept of separator embedding itself Li salt thanks to a Li salt rich film coated on. The objective of study was to quantify the impact (benefits and drawbacks) of a Li salt containing PVdF based film deposited by coating onto a conventional polyolefin based separator. A protocol for elaborating the salt based polymeric solution to be coated onto a commercial polyolefin separator was developed at CEA/LITEN. Separators were coated with solutions at a defined coating thickness. The samples were characterized in terms of salt loading, morphology of the layers, adhesion of the film on the separator, ionic conductivity and ability to be soaked by the electrolyte. Some cycling tests were undertaken in full coin cells Cgr / LiFePO4 and soft pouch cells with samples of coated separators in order to evaluate the impact of the manufacturing conditions on the electrical performances. The impact of the storage conditions of the coated separator was also studied.