Poly(Ethylene Glycol-block-2-Ethyl-2-Oxazoline) as Cathode Binder in Lithium-Sulfur Batteries

Jang, Hohyoun (author): Uppsala universitet,Institutionen för kemi - Ångström,Konkuk Univ, Coll Liberal Arts, Chungju 27478, South Korea

Lacey, Matthew J. (author): Uppsala universitet,Strukturkemi,Scania CV AB, S-15187 Södertälje, Sweden

(creator_code:org_t)

2021-08-03
2021
English.
In: ChemistryOpen. - : John Wiley & Sons. - 2191-1363. ; 10:10, s. 960-965

Related links:: https://doi.org/10.1...; show more...; https://uu.diva-port... (primary) (Raw object); https://onlinelibrar...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Functional binders constitute a strategy to overcome several challenges that lithium-sulfur (Li-S) batteries are facing due to soluble reaction intermediates in the positive electrode. Poly (ethylene oxide) (PEO) and poly (vinylpyrrolidone) (PVP) are in this context a previously well-explored binder mixture. Their ether and amide groups possess affinity to the dissolved sulfur species, which enhances the sulfur utilization and mitigates the parasitic redox shuttle. However, the immiscibility of PEO and PVP is a concern for electrode stability. Copolymers comprising ether and amide groups are thus promising candidates to improve the stability the system. Here, a series of poly (ethylene glycol-block-2-ethyl-2-oxazoline) with various block lengths is synthesized and explored as binders in S/C composite electrodes in Li-S cells. While the electrochemical analyses show that although the sulfur utilization and capacity retention of the tested electrodes are similar, the integrity of the as-cast electrodes can play a key role for power capability.

By the author/editor: Chien, Yu-Chuan, ...; Jang, Hohyoun; Brandell, Daniel ...; Lacey, Matthew J ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Materials Chemis ...

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