Macroporous poly(vinylidene fluoride) membrane as a separator for lithium-ion batteries with high charge rate capacity

Damien Djian , Fannie Alloin (1) , Sébastien S. Martinet , Hélène H. Lignier

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

The performance of PVdF macroporous separators used in lithium battery at high charge rates was evaluated using Li₄Ti₅O₁₂ and LiMn₂O₄ as negative and positive electrodes respectively. The effects of the non-solvent used, the PVdF concentration in the good solvent and the thickness of the swelled membrane on membrane porosity and on the conductivity of the separator + liquid electrolyte were evaluated. The conductivity decrease, induced by the porous separator introduction and separator thickness influence notably battery performance for high charge rate.

Mots clés: Li₄Ti₅O₁₂; PVdF; Macroporous membrane; Lithium-ion battery; High charge rate

Domaines: Matériaux

Damien Djian, Fannie Alloin, Sébastien S. Martinet, Hélène H. Lignier. Macroporous poly(vinylidene fluoride) membrane as a separator for lithium-ion batteries with high charge rate capacity. Journal of Power Sources, 2009, 187 (2), pp. 575-580. ⟨10.1016/j.jpowsour.2008.11.027⟩. ⟨hal-00384867⟩