A Novel Li+‐Conducting Polymer Membrane Gelled by Fluorine‐Free Electrolyte Solutions for Li‐Ion Batteries. Issue 10 (13th July 2020)

• Record Type: Journal Article
• Authors: Navarra, Maria Assunta; Tsurumaki, Akiko; Vitucci, Francesco Maria; Paolone, Annalisa; Palumbo, Oriele; Panero, Stefania
• Is Part Of: Batteries & supercaps. Volume 3:Issue 10(2020)
• Page Start: 1112
• Page End: 1119
• Publication Date: 2020-07-13
• Subjects: gel polymer electrolytes -- energy storage -- one-pot synthesis -- lithium-ion batteries; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202000078
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Gel polymer electrolytes (GPEs), composed of poly(vinylidene fluoride) (PVdF), a ternary solvent of ethylene carbonate : propylene carbonate : dimethyl carbonate, and LiBOB, which are characterized by a novel composition with a fluorine‐free lithium salt, are here proposed. GPEs were firstly prepared through a solution casting procedure using the ternary carbonate solution as a solvent (named ex situ prepared membranes), and then activated by being immersed in a 0.7 M LiBOB‐carbonate solution. Fundamental characterizations, including thermal, spectroscopical, mechanical, and electrochemical analyses, were carried out and compared before and after the activation. GPEs, having the same composition, were also prepared by using a novel procedure (named in situ prepared membranes), involving the formation of PVdF membrane and its activation by the LiBOB electrolyte, as well as subsequent electrochemical characterizations, in the same T‐shape cell. Thus prepared lithium‐ion batteries, employing Sn−C and LiFePO4 electrodes, were demonstrated to exhibit a high capacity of 150 mAh g −1 through the course of cycling. Abstract : Saved by the gel : In situ gel polymer electrolyte (GPE) preparation, directly in the T‐shape cell used performance tests, is proposed. The GPE has novel composition, with a fluorine‐free LiBOB salts. The SnC|LiFePO4 lithium‐ion battery, having in situ GPE, exhibits a high capacity of about 150 mAh g −1 through a course of cycling.