Study of lithiated Nafion ionomer for lithium batteries

Abstract

Lithiated Nafion 112 ionomer was characterized by FT-IR spectroscopy, AC impedance, and cyclic voltammetry. The ionomer swollen with mixed solvents of propylene carbonate (PC) and ethylene carbonate shows ionic conductivity of 8.18 · 10 )5 S cm )1 at 25°C and good electrochemical stability to allow operation in Li/ionomer/ LiCoO 2 cells. The discharge capacity of the first cycle is 126 mAh g )1 . Significant capacity loss occurs during cycling due to the presence of PC. AC impedance shows that the passive layer formed at the Li/ionomer interface dominates the cycling performance of the cell.

Highly Conductive, Sulfonated, UV-Cross-Linked Separators for Li–S Batteries

“…Membranes based on the fluorinated polymeric ionomer (Nafion TM ) have been used for this purpose in several recent Li-S studies. [18][19][20][21] Nafion is a copolymer of tetrafluoroethylene and sulfonate terminated perfluoro vinyl ether, and it has been a popular choice as the membrane material in hydrogen fuel cells because of its excellent electrochemical stability and high proton conductivity. 22 In high dielectric constant media, the sulfonate-terminated perfluoroalkyl ether pendant groups on Nafion dissociate and take on a negative charge, which produces a strong electrostatic field in the Debye layer surrounding the membrane pore walls that enables the rejection of negatively charged ions (e.g.…”

Application of lithiated Nafion ionomer film as functional separator for lithium sulfur cells

“…Doyle and Sachan studied the ionic conductivity and swelling behavior of lithiated Nafion ionomers in a wide range of nonaqueous solvents respectively [13e15]. Liang studied LiCoO 2 cell using lithiated Nafion film swollen with propylene carbonate/ethylene carbonate mixture as electrolyte, indicating that the ionomer electrolyte is usable in the Li-ion cell [16].…”

Construction of a lithium ion transport network in cathode with lithiated bis(benzene sulfonyl)imide based single ion polymer ionomers

“…As a consequence, the electrostatic interaction between the cations and the anion-containing substance becomes relatively weak, resulting in high mobility of lithium ions in the electrolyte material. Indeed, the reported values of ion transference numbers derived from electrochemical measurements for single ion conducting electrolyte materials, such as lithiated Nafion [28,32,33], lithium tartaric acid borate [11], LiPAAOB [9], Li[PSTFSI-co-MPEGA] [21] and P(STFSILi)-b-PEO-b-P(STFSILi) [8], are substantially higher than the values of dual-ion based electrolytes [3e6]. Recently, we have also reported successful syntheses of a series of single ion conducting polymeric electrolytes based on the sp 3 configuration of boron [34e36] and bis(sulfonyl)imide [37e40].…”