Novel Highly Conductive Polymer Electrolytes for Li-Ion Batteries Applications

Tuesday, 26 May 2015: 09:00
Salon A-5 (Hilton Chicago)
M. Leclere (CEA-Grenoble, INSA-Lyon), H. Mendil-Jakani, P. Rannou, S. Lyonnard (CEA-Grenoble, INAC/SPrAM, UMR 5819, France), S. Livi (INSA - IMP - UMR CNRS 5223), G. Gebel (CEA Grenoble - LITEN/DTNM/DIR - France), J. Duchet-Rumeau (INSA- IMP - UMR CNRS 5223- France), and L. Picard (CEA-Grenoble, LITEN/ DEHT/ SCGE/ LGI, France)
One of the most important research topics in the field of Li-ion batteries is the substitution of the conventional liquid electrolytes by solid polymer electrolytes for increasing both safety and performances. But another approach concerning the conduction mechanisms of the Li+ has to be envisaged to increase the intrinsic performance of the polymer. Recently, a new approach has been developed by Armand & al [1,2]: they immobilize the anion on a block copolymer using STFSI[i]  monomer for one block.  But the conduction mechanism is still ensured by POE blocks.

In this work we developed a novel class of anionic epoxy polymer electrolytes, with noteable properties (thermotropic liquid crystalline), involving a new mode of Li+ mobility. The thermodynamic encryption given by the nature of different segment of the polymer lead to a self-organization of the polymer (columnar, lamellar, gyroid …). We propose that the anionic sites are thus organized for efficient Li-conduction by a hoping mechanism as presented in the figure below. The synthesis and electrochemical properties of this new crystalline polyelectrolyte were investigated. The preliminary results showed a RT conductivity over 0.1 mS.cm-1.

[i] 4-styrenesulfonyl)(trifluoromethanesulfonyl)imide

[1] Meziane, R; Bonnet, J.P; Courty, M; Djellab, K; Armand, M. Electrochimica Acta, 2011, 57, 14

[2] Bouchet, R; Maria, S; Meziane, R. ; Aboulaich, A ; Lienafa, L ; Bonnet, J.P ; Phan, T. N. T. ; Bertin, D ; Gigmes, D. ; Devaux, D; Denoyel, R ; Armand, M. Nature Materials, 2013,12,452