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

Abstract

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.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]
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  1. Univ. of Rhode Island, Kingston, RI (United States)
Publication Date:
Research Org.:
Univ. of Rhode Island, Kingston, RI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1830719
Grant/Contract Number:  
SC0021392
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 6; Journal Issue: 11; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Additives; Electrochemical cells; Surface chemistry; Electrolytes; Lithium

Citation Formats

Chae, Oh B., Adiraju, Venkata A. K., and Lucht, Brett L. Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries. United States: N. p., 2021. Web. doi:10.1021/acsenergylett.1c01999.
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Chae, Oh B., Adiraju, Venkata A. K., & Lucht, Brett L. Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries. United States. https://doi.org/10.1021/acsenergylett.1c01999
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Chae, Oh B., Adiraju, Venkata A. K., and Lucht, Brett L. Mon . "Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries". United States. https://doi.org/10.1021/acsenergylett.1c01999. https://www.osti.gov/servlets/purl/1830719.
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@article{osti_1830719,
title = {Lithium Cyano Tris(2,2,2-trifluoroethyl) Borate as a Multifunctional Electrolyte Additive for High-Performance Lithium Metal Batteries},
author = {Chae, Oh B. and Adiraju, Venkata A. K. and Lucht, Brett L.},
abstractNote = {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.},
doi = {10.1021/acsenergylett.1c01999},
journal = {ACS Energy Letters},
number = 11,
volume = 6,
place = {United States},
year = {Mon Oct 11 00:00:00 EDT 2021},
month = {Mon Oct 11 00:00:00 EDT 2021}
}
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https://doi.org/10.1021/acsenergylett.1c01999
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