Ionic liquid electrolytes for high-voltage rechargeable Li/LiNi 0.5Mn1.5O4 cells

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Title:	Ionic liquid electrolytes for high-voltage rechargeable Li/LiNi 0.5Mn1.5O4 cells
Authors:	李勝偉;Wongittharom, Nithinai;Lee, Tai-Chou;Hung, I.-Ming;Lee, Sheng-Wei;Wang, Yi-Chen;Chang, Jeng-Kuei
Contributors:	工學院材料科學與工程研究所
Keywords:	aluminum;cathodes;corrosion;electric potential difference;electrolytes;ionic liquids;salts;sol-gel processing;temperature;thermal stability
Date:	2014-03-14
Issue Date:	2026-04-23 11:37:50 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： A high-voltage LiNi₀.₅Mn₁.₅O₄ cathode material with a cubic spinel structure is synthesized using a citric-acid-assisted sol–gel process. Butylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP-TFSI)-based ionic liquids (ILs) with various kinds of Li salts, namely LiTFSI, LiPF₆, and their mixtures, are used as electrolytes for Li/LiNi₀.₅Mn₁.₅O₄ cells. The IL electrolytes show high thermal stability (>400 °C) and non-flammability, and are thus ideal for high-safety applications. At 25 °C, LiTFSI is more suitable than LiPF₆ as an IL electrolyte in terms of cell capacity, rate capability, and cyclic stability. The IL electrolytes clearly outperform the conventional organic electrolytes at 50 °C, since the latter decomposes at high voltage and corrodes both the Al current collector and LiNi₀.₅Mn₁.₅O₄, degrading the electrode performance. At such an elevated temperature, using LiPF₆ to partially substitute LiTFSI in the IL electrolyte can effectively suppress Al pitting corrosion and thus improves the cell performance. In the 0.4 M LiTFSI/0.6 M LiPF₆ mixed-salt IL electrolyte, an LiNi₀.₅Mn₁.₅O₄ discharge capacity of 115 mA h g⁻¹ (at 0.1 C) is obtained at 50 °C with a high cell voltage of ∼4.7 V. 出版日期： 2014-01-01 出處： Journal of materials chemistry. A, Materials for energy and sustainability, 2014-01, Vol.2 (10), p.3613-3620 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7488 識別號： ISSN: 2050-7496 識別號： EISSN: 2050-7496 識別號： DOI: 10.1039/c3ta14423b
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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