A 3D Network Based on Poly(ε-caprolactone) Macromonomers as Polymer Electrolyte for Solid State Lithium Metal Batteries. Issue 8 (8th May 2020)

• Record Type: Journal Article
• Authors: Jalbert, Pierre-Michel; Commarieu, Basile; Daigle, Jean-Christophe; Claverie, Jerome P.; Zaghib, Karim
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 8(2020)
• Publication Date: 2020-05-08
• Subjects: all-solid-state battery -- solid polymer electrolyte -- Batteries - Lithium; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ab8de0
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A commercial low molecular weight poly( ε -caprolactone) was chain-extended with acrylate moieties to create a macromonomer, which was then polymerized by radical reaction in the presence of different amounts of lithium bis(trifluoromethanesulfonyl)imide, LiTFSI, to obtain a 3D network Solid Polymer Electrolyte (SPE). The SPE with the largest ionic conductivity (24 μ S cm −1 at 50 °C) had a high transference number of 0.78 and could form a self-standing film. Lithium Iron Phosphate (LFP)/SPE/Li cells made with this SPE attained a specific capacity of 120 mA.h.g −1 . At 50 °C, the initial capacity declined by less than 15% after 150 cycles at 0.2 C. No evidence of degradation and dendrite growth was observed, indicating that the 3D network was stable. Thus, caprolactone-based 3D networks are promising materials for the fabrication of all solid-state batteries with high stability and cyclability, at near room temperature.