File
Authors
Yamaguchi, Kazuki
Keywords
Silicon
Li-ion battery
Ionic liquid electrolyte
Anion
Gas-deposition
Abstract
We investigated the influence of the anions in ionic liquid electrolytes on the electrochemical
performance of a silicon (Si) negative electrode for a lithium-ion battery. While the electrode
exhibited poor cycle stability in tetrafluoroborate-based and propylene carbonate-based electrolytes, better cycle performance was achieved in bis(fluorosulfonyl)amide (FSA–)- and
bis(trifluoromethanesulfonyl)amide (TFSA–)-based electrolytes, in which the discharge capacity of a Si electrode was more than 1000 mA h g–1 at the 100th cycle. It is considered that a surface film derived from FSA–- and TFSA–-based electrolytes effectively suppressed continuous decomposition of the electrolyte. In a capacity limitation test, a discharge capacity of 1000 mA h g–1 was maintained even after about the 1600th cycle in the FSA–-based electrolyte, which corresponds to a cycle life almost twice as long as that in TFSA–-based electrolyte. This result should be explained by the high structural stability of FSA–-derived surface film. In addition, better rate capability with a discharge capacity of 700 mA h g–1 was obtained at a high current rate of 6 C (21 A g–1) in FSA–-based electrolyte, which was 7-fold higher than that in TFSA–-based electrolyte. These results clarified that FSA–-based ionic liquid electrolyte is the most promising candidate for Si-based negative electrodes.
Publisher
Elsevier
Content Type
Journal Article
Link
ISSN・ISBN
0378-7753
NCID
AA00705373
Journal Title
Journal of Power Sources
Current Journal Title
Journal of Power Sources
Volume
338
Start Page
103
End Page
107
Published Date
2017-01-15
Publisher-DOI
Text Version
Author
Rights
Copyright © 2017 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Citation
This research was published by Elsevier Inc.: K. Yamaguchi, et al. Influence of the structure of the anion in an ionic liquid electrolyte on the electrochemical performance of a silicon negative electrode for a lithium-ion battery. Journal of Power Sources.2017, 338, 103-107
Department
Faculty of Engineering/Graduate School of Engineering
Language
English