Why PEO as a binder or polymer coating increases capacity in the Li-S system.
PEO, used either as a binder or a polymer coating, and PEGDME, used as an electrolyte additive, are shown to increase the reversible capacity of Li-S cells. The effect, in all three cases, is the same: an improved solvent system for the electrochemistry of sulfur species and suppression of cathode passivation on discharge. This constitutes a novel interpretation of the mechanistic behaviour of polyethers in the Li-S system, and sheds new light upon several previous studies.
Department of Chemistry - Ångström Laboratory, Uppsala University, Box 538, SE-75121 Uppsala, Sweden. matthew.lacey@kemi.uu.se.
Matthew J
MJ
Lacey
Fabian
F
Jeschull
Kristina
K
Edström
Daniel
D
Brandell