Lithium-ion batteries with high charge rate capacity: Influence of the porous separator

Damien Djian , Fannie Alloin (1) , Sébastien S. Martinet , Hélène H. Lignier , Jean-Yves Sanchez (1)

1 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

The performance of commercial separators at high charge rates was evaluated using Li₄Ti₅O₁₂ and LiMn₂O₄ as negative and positive electrodes, respectively. Most of the porous separators tested induced a sharp decrease in the conductivity of the liquid electrolyte. The conductivity decrease was related to the amount of porosity, polymer/electrolyte affinity, and the size of the pores and their interconnection. The decrease in conductivity induced by the separator incorporation and the separator thickness seems to be relevant indicators for optimizing a separator dedicated to high charge rate lithium-ion batteries.

Mots clés: Li₄Ti₅O₁₂; Polyolefin; Lithium-ion battery; High charge rate

Domaines: Matériaux

Damien Djian, Fannie Alloin, Sébastien S. Martinet, Hélène H. Lignier, Jean-Yves Sanchez. Lithium-ion batteries with high charge rate capacity: Influence of the porous separator. Journal of Power Sources, 2007, 172 (1), pp. 416-421. ⟨10.1016/j.jpowsour.2007.07.018⟩. ⟨hal-00386372⟩