Pre-Film Formation and Cycle Performance of Silicon-Flake-Powder Negative Electrode in a Solvate Ionic Liquid for Silicon-Sulfur Rechargeable Batteries. Issue 9 (19th June 2018)

• Record Type: Journal Article
• Authors: Haruta, Masakazu; Moriyasu, Takashi; Tomita, Akira; Takenaka, Toshio; Doi, Takayuki; Inaba, Minoru
• Is Part Of: Journal of the Electrochemical Society. Volume 165:Issue 9(2018)
• Page Start: A1874
• Page End: A1879
• Publication Date: 2018-06-19
• Subjects: silicon negative electrode -- solid electrolyte interface -- solvate ionic liquid; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1291809jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : In developing silicon-sulfur batteries with a high energy density, the cycle performance of a Si-flake-powder (Si LeafPowder, Si-LP) negative electrode in a solvate ionic liquid of lithium salt-glyme equimolar complex electrolyte were improved by stable pre-film formation on the Si-LP. The pre-film was formed by pre-cycling in a fluoroethylene carbonate-based electrolyte prior to cycle tests in the glyme-based electrolyte. The capacity retention of the pre-cycled Si-LP electrode in the glyme-based electrolyte improved remarkably. Surface deposition originating from decomposition products of the electrolyte decreased by formation of the pre-film. The pre-film consisted of fine LiF grains and organo-fluorine compounds, the combination of which is important for inhibiting decomposition of the glyme-based electrolyte on Si negative electrodes.