Kalhoff Julian, Bresser Dominic, Bolloli Marco, Alloin Fannie, Sanchez Jean-Yves, Passerini Stefano
Institute of Physical Chemistry & MEET Battery Research Centre, University of Muenster, Corrensstrasse 28/30 & 46, 48149 Muenster (Germany).
ChemSusChem. 2014 Oct;7(10):2939-46. doi: 10.1002/cssc.201402502. Epub 2014 Aug 19.
In this Full Paper we show that the use of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as conducting salt in commercial lithium-ion batteries is made possible by introducing fluorinated linear carbonates as electrolyte (co)solvents. Electrolyte compositions based on LiTFSI and fluorinated carbonates were characterized regarding their ionic conductivity and electrochemical stability towards oxidation and with respect to their ability to form a protective film of aluminum fluoride on the aluminum surface. Moreover, the investigation of the electrochemical performance of standard lithium-ion anodes (graphite) and cathodes (Li[Ni1/3 Mn1/3 Co1/3 ]O2 , NMC) in half-cell configuration showed stable cycle life and good rate capability. Finally, an NMC/graphite full-cell confirmed the suitability of such electrolyte compositions for practical lithium-ion cells, thus enabling the complete replacement of LiPF6 and allowing the realization of substantially safer lithium-ion batteries.
在本论文中，我们表明，通过引入氟化线性碳酸酯作为电解质（共）溶剂，在商用锂离子电池中使用双（三氟甲磺酰）亚胺锂（LiTFSI）作为导电盐成为可能。基于LiTFSI和氟化碳酸酯的电解质组合物在离子电导率、对氧化的电化学稳定性以及在铝表面形成氟化铝保护膜的能力方面进行了表征。此外，对半电池配置中标准锂离子阳极（石墨）和阴极（Li[Ni1/3 Mn1/3 Co1/3 ]O2 ，NMC）的电化学性能研究表明，其具有稳定的循环寿命和良好的倍率性能。最后，一个NMC/石墨全电池证实了这种电解质组合物适用于实际的锂离子电池，从而能够完全替代LiPF6 ，并实现本质上更安全的锂离子电池。
