Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries

Chae, Oh B.; Adiraju, Venkata A. K.; Lucht, Brett L.

doi:10.1021/acsenergylett.1c01999

Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries

Journal Article · Mon Oct 11 00:00:00 EDT 2021 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.1c01999· OSTI ID:1830719

Chae, Oh B. ^[1]; ^[2]; ^[2]

Univ. of Rhode Island, Kingston, RI (United States); University of Rhode Island, Department of Chemistry
Univ. of Rhode Island, Kingston, RI (United States)

Lithium cyano tris(2,2,2-trifluoroethyl) borate (LCTFEB) has been synthesized and investigated as a new electrolyte additive for high performance of lithium metal batteries. LCTFEB is prepared by the reaction of tris(2,2,2-trifluoroethyl) borate with lithium cyanide. Incorporation of LCTFEB into carbonate-based electrolyte has been investigated. The electrochemical performance of NCM523/Li cells as well as symmetric Li/Li cells are significantly improved upon incorporation of LCTFEB (5 wt.%) into the electrolyte. Various characterizations of lithium metal morphology and the solid electrolyte interphase (SEI) on the lithium metal anode have been conducted using by FE-SEM, cryo-TEM and XPS suggesting the generation of a thin (≈ 10 nm) LiF rich SEI with low concentrations of B and N-compounds. The different SEI structure is formed by the preferential reductive decomposition of LCTFEB resulting in improved electrochemical performance. As a result, the new electrolyte additive provides insight into innovative approaches for multi-functional electrolyte additive design.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rhode Island, Kingston, RI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0021392

OSTI ID:: 1830719

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 11 Vol. 6; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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