@article{31900,
  author = {Ximei Gao and Guobin Zhu and Qunting Qu and Gao Liu and Vincent S Battaglia and Honghe Zheng},
  title = {Effects of Room Ionic Liquid as Solute on the Electrolyte Solution Structure and Electrochemical Performances in Ethylene Carbonate-Based Electrolyte},
  abstract = {<p>Room ionic liquid N-allyl-N-methylpiperidinium bis(trifuoromethansulfonyl)imide (PP<sub>13</sub>∗ TFSI) was adopted as a solute to partly substitute LiPF6 in concentrated ethylene carbonate (EC) based electrolyte (1.8 mol L−1 LiPF6 /EC). Raman and FTIR spectroscopic studies revealed that the electrolyte solution structure was adjusted in the presence of&nbsp;<span>PP</span><sub>13</sub><span>∗ TFSI</span> ionic liquid. Solvation number of Li+ cation could be effectively regulated by the competitive coordination of PP<sub>13</sub>∗+ and Li+ with EC molecules. More importantly, the appearance of TFSI− anion brings about a different coordinating environment of PF<sub>6</sub>− anion in virtue of the stronger association capability of the TFSI− than that of PF<sub>6</sub>−, which resulted in a content regulation of the SEI components between Li<sub>2</sub> CO<sub>3</sub> and LiF, finally contributing to a remarkable cycle life of graphite/Li cell comprising electrolyte with <span>PP</span><sub>13</sub><span>∗ TFSI</span>. The optimized molar ratio between LiPF<sub>6</sub> salt and&nbsp;<span>PP</span><sub>13</sub><span>∗ TFSI</span> ionic liquid was obtained to be 3:1. Differential scanning calorimetry (DSC) confirmed significantly widened liquid range in the EC-based electrolytes with&nbsp;<span>PP</span><sub>13</sub><span>∗ TFSI</span> substitution. This work will provide a new insight and thinking on the application of room ionic liquid.</p>},
  year = {2018},
  journal = {Journal of The Electrochemical Society},
  volume = {165},
  pages = {A3844 - A3853},
  month = {12/2018},
  issn = {0013-4651},
  doi = {10.1149/2.0491916jes},
  language = {eng},
}