Comparing measurement of limiting current in block copolymer electrolytes as a function of salt concentration with theoretical predictions

Frenck, Louise; Veeraraghavan, Vijay D.; Maslyn, Jacqueline A.; Balsara, Nitash P.

doi:10.1016/j.electacta.2022.139911

Title: Comparing measurement of limiting current in block copolymer electrolytes as a function of salt concentration with theoretical predictions

Journal Article · 13 January 2022 · Electrochimica Acta

DOI: https://doi.org/10.1016/j.electacta.2022.139911 · OSTI ID:1958526

Frenck, Louise ^[1]; Veeraraghavan, Vijay D. ^[2]; Maslyn, Jacqueline A. ^[1]; Balsara, Nitash P. ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

Optimizing electrolyte performance is crucial for the widespread adoption of electrochemical energy storage. We demonstrate that limiting current provides a robust criterion for determining the optimum electrolyte. Experiments were conducted on rigid block copolymer electrolytes comprising mixtures of polystyrene-block-poly(ethylene oxide) copolymer (SEO) and lithium bis(trifluoromethanesulfonyl) imide salt (LiTFSI) over a salt concentration range from r_av = 0.04 to r_av = 0.20 (r_av is the molar ratio of lithium ions to ethylene oxide). Here we show that the maximum limiting current density is 4.3 mA cm^–2 at r_av = 0.12. The dependence of limiting current on salt concentration is in good agreement with predictions from Newman's concentrated solution theory with no adjustable parameters.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1958526

Journal Information:: Electrochimica Acta, Journal Name: Electrochimica Acta Vol. 409; ISSN 0013-4686

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Comparing measurement of limiting current in block copolymer electrolytes as a function of salt concentration with theoretical predictions

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