Abstract
A dinitrile compound containing ethylene oxide moiety (4,7-dioxa-1,10-decanedinitrile, NEON) is synthesized as an electrolyte solvent for high-voltage lithium-ion batteries. The introduction of ethylene oxide moiety into the conventional aprotic aliphatic dinitrile compounds improves the solubility of lithium hexafluorophosphate (LiPF6) used commercially in the lithium-ion battery industry. The electrochemical performances of the NEON-based electrolyte (0.8 M LiPF6 + 0.2 M lithium oxalyldifluoroborate in NEON:EC:DEC, v:v:v = 1:1:1) are evaluated in graphite/Li, LiCoO2/Li, and LiCoO2/graphite cells. Half-cell tests show that the electrolyte exhibits significantly improved compatibility with graphite by the addition of vinylene carbonate and lithium oxalyldifluoroborate and excellent cycling stability with a capacity retention of 97 % after 50 cycles at a cutoff voltage of 4.4 V in LiCoO2/Li cell. A comparative experiment in LiCoO2/graphite full cells shows that the electrolyte (NEON:EC:DEC, v:v:v = 1:1:1) exhibits improved cycling stability at 4.4 V compared with the electrolyte without NEON (EC:DEC, v:v = 1:1), demonstrating that NEON has a great potential as an electrolyte solvent for the high-voltage application in lithium-ion batteries.
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Acknowledgments
This work is supported by the Hundred Talents Program of the Chinese Academy of Sciences, the National Science Foundation of China (50973112/21202165), Guangzhou Municipal Project of Science and Technology (11A44061500), Guangzhou Municipal Program of Cooperative Innovation, and Science and Technology Project of Huangpu District of Guangzhou City (201423).
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Xie, B., Mai, Y., Wang, J. et al. Dinitrile compound containing ethylene oxide moiety with enhanced solubility of lithium salts as electrolyte solvent for high-voltage lithium-ion batteries. Ionics 21, 909–915 (2015). https://doi.org/10.1007/s11581-014-1272-3
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DOI: https://doi.org/10.1007/s11581-014-1272-3