Detection of the Order-to-Disorder Transition in Block Copolymer Electrolytes Using Quadrupolar 7Li NMR Splitting

Lorena S Grundy; Gurmukh K Sethi; Michael D Galluzzo; Whitney S Loo; Jacqueline A Maslyn; Alexander A Teran; Jacob L Thelen; Ksenia Timachova; Jeffrey A Reimer; Louis A Madsen; Nitash P Balsara

doi:10.1021/acsmacrolett.8b00809

Detection of the Order-to-Disorder Transition in Block Copolymer Electrolytes Using Quadrupolar ⁷Li NMR Splitting

ACS Macro Lett. 2019 Feb 19;8(2):107-112. doi: 10.1021/acsmacrolett.8b00809. Epub 2019 Jan 10.

Authors

Lorena S Grundy, Gurmukh K Sethi, Michael D Galluzzo, Whitney S Loo, Jacqueline A Maslyn, Alexander A Teran, Jacob L Thelen, Ksenia Timachova, Jeffrey A Reimer, Louis A Madsen¹, Nitash P Balsara

Affiliation

¹ Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.

PMID: 35619416
DOI: 10.1021/acsmacrolett.8b00809

Abstract

The order-to-disorder transition temperature (T_ODT) in a series of mixtures of polystyrene-b-poly(ethylene oxide) (SEO) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is identified by the disappearance of a quadrupolar ⁷Li NMR triplet peak splitting above a critical temperature, where a singlet is observed. The macroscopic alignment of ordered domains required to produce a quadrupolar splitting occurs due to exposure to the NMR magnetic field. Alignment is confirmed using small-angle X-ray scattering (SAXS). The T_ODT determined by NMR is consistent with that determined using SAXS.