Mixed ionic liquid/organic carbonate electrolytes for LiNi0.8Co0.15Al0.05O2 electrodes at various temperatures

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Title:	Mixed ionic liquid/organic carbonate electrolytes for LiNi0.8Co0.15Al0.05O2 electrodes at various temperatures
Authors:	李岱洲;Patra, Jagabandhu;Wang, Chueh-Han;Lee, Tai-Chou;Wongittharom, Nithinai;Lin, Yi-Chuan;Ting-Kuo Fey, George;Majumder, S. B;Hsieh, Chien-Te;Chang, Jeng-Kuei
Contributors:	工學院化學工程與材料工程學系
Date:	2015-12-11
Issue Date:	2026-04-21 14:43:36 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： Mixtures of N -butyl- N -methyl pyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid (IL) and conventional organic carbonate electrolyte are used for high-capacity LiNi 0.8 Co 0.15 Al 0.05 O 2 (LNCA) electrodes in Li-ion batteries. Increasing the IL content ratio in the mixtures can increase the electrolyte's thermal stability and retard its flammability. However, the optimal electrolyte composition depends on the operating temperature. At 25 °C, the plain organic electrolyte is preferred due to its highest ionic conductivity among the tested electrolytes. This electrolyte is volatile at 50 °C, and thus the incorporation of 25 wt% IL can improve the cyclic stability of the LNCA electrode. The LNCA dissolution and electrolyte decomposition at 75 °C are clearly suppressed with a high IL ratio in the mixed electrolyte. At such a high temperature, with 75 wt% of IL incorporation a high electrode capacity of 195 mA h g −1 is obtained at 30 mA g −1 ; 50% of this capacity can be retained when the charge-discharge rate increases to 700 mA g −1 . Moreover, less than 20% capacity decay is found after 100 cycles. At various temperatuers, different IL ratios in mixed electrolytes should be adopted to optimize cell relaibility and charge-discharge performance. 出版日期： 2015-12-16 資源來源： Royal Society of Chemistry 識別號： EISSN: 2046-2069 識別號： DOI: 10.1039/c5ra21386j
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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