A Lithium-Ion Battery with Enhanced Safety Prepared using an Environmentally Friendly Process

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• 作者：Franziska Mueller ; Nicholas Loeffler ; Dr. Guk-Tae Kim ; Dr. Thomas Diemant ; Prof. Dr. R. Jü ; rgen Behm and Prof. Dr. Stefano Passerini
• 刊名：ChemSusChem
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：9
• 期：11
• 页码：1290-1298
• 全文大小：2288K
• ISSN：1864-564X

文摘

A new lithium-ion battery chemistry is presented based on a conversion–alloying anode material, a carbon-coated Fe-doped ZnO (TMO-C), and a LiNi_1/3Mn_1/3Co_1/3O₂ (NMC) cathode. Both electrodes were fabricated using an environmentally friendly cellulose-based binding agent. The performance of the new lithium-ion battery was evaluated with a conventional, carbonate-based electrolyte (ethylene carbonate:diethyl carbonate–1 m lithium hexafluorophosphate, EC:DEC 1 m LiPF₆) and an ionic liquid (IL)-based electrolyte (N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide–0.2 m lithium bis(trifluoromethanesulfonyl)imide, Pyr₁₄TFSI 0.2 m LiTFSI), respectively. Galvanostatic charge/discharge tests revealed a reduced rate capability of the TMO-C/Pyr₁₄TFSI 0.2 m LiTFSI/NMC full-cell compared to the organic electrolyte, but the coulombic efficiency was significantly enhanced. Moreover, the IL-based electrolyte substantially improves the safety of the system due to a higher thermal stability of the formed anodic solid electrolyte interphase and the IL electrolyte itself. While the carbonate-based electrolyte shows sudden degradation reactions, the IL exhibits a slowly increasing heat flow, which does not constitute a serious safety risk.