Electrochemical performance of 0.5Li2MnO3-0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathode in pyrrolidinium-based ionic liquid electrolytes

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题名:	Electrochemical performance of 0.5Li2MnO3-0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathode in pyrrolidinium-based ionic liquid electrolytes
作者:	曾重仁;Patra, Jagabandhu;Dahiya, Prem Prakash;Tseng, Chung-Jen;Fang, Jason;Lin, Yu-Wei;Basu, S.;Majumder, S.B.;Chang, Jeng-Kuei
贡献者:	工學院能源工程研究所
关键词:	Composite cathode;Electrolyte;Ionic liquid;Lithium rechargeable battery;Temperature
日期:	2015-06-20
上传时间:	2026-04-23 11:58:53 (UTC+8)
出版者:	Elsevier;Elsevier B.V
摘要:	摘要： High-energy-density 0.5Li2MnO3–0.5Li(Mn0.375Ni0.375Co0.25)O2 composite cathodes for lithium rechargeable batteries are synthesized using an auto-combustion method. The electrode charge–discharge properties are studied at 25 and 50 °C in Li+-containing N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (BMP–TFSI) and N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMP–TFSI) ionic liquid (IL) electrolytes. The IL electrolytes have a high decomposition temperature (∼400 °C) and thus are ideal for high-safety applications. Compared to Li+/BMP–TFSI IL, Li+/PMP–TFSI IL exhibits higher ionic conductivity and lower viscosity. As a result, the composite cathode shows superior electrochemical performance in Li+/PMP–TFSI IL electrolyte. With the increase in cell temperature from 25 to 50 °C, the maximum capacities and rate capabilities of both IL cells improve significantly. Thus at 50 °C, discharge capacities of 304 mAh g−1 (10 mA g−1) and 223 mAh g−1 (100 mA g−1) are obtained for the Li+/PMP–TFSI cell. These capacities are superior to those for a control cell made with the same composite cathode and a conventional organic electrolyte. At elevated temperature, the cyclability of the composite cathode in the IL electrolytes is markedly higher than that obtained in a conventional organic electrolyte. •High-energy-density cathodes are synthesized using an auto-combustion method.•ILs have high thermal stability and are thus ideal for high-safety applications.•Li+/PMP–TFSI IL (rather than Li+/BMP–TFSI IL) exhibits high ionic conductivity.•At 50 °C, a high capacity of 304 mAh g−1 is obtained for the Li+/PMP–TFSI cell.•ILs (instead of organic electrolyte) increase the electrode cyclability at 50 °C. 出版者： Elsevier B.V 出版日期： 2015-10-30 出處： Journal of power sources, 2015-10, Vol.294, p.22-30 資源來源： Elsevier ScienceDirect Freedom Collection 版權： 2015 Elsevier B.V. 識別號： ISSN: 0378-7753 識別號： EISSN: 1873-2755 識別號： DOI: 10.1016/j.jpowsour.2015.06.035
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