The author of 《Effect of film-forming additive in ionic liquid electrolyte on electrochemical performance of Si negative-electrode for LIBs》 were Yamaguchi, Kazuki; Domi, Yasuhiro; Usui, Hiroyuki; Shimizu, Masahiro; Morishita, Shota; Yodoya, Shuhei; Sakata, Takuma; Sakaguchi, Hiroki. And the article was published in Journal of the Electrochemical Society in 2019. Electric Literature of C3H2O3 The author mentioned the following in the article:
1-Ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide (EMI-TFSA) is one of the promising ionic liquids as electrolyte solvent to enhance the electrochem. performance of Si electrode for Li-ion batteries (LIBs) because of its low viscosity and high conductivity However, it has low stability against reduction and its reductive decomposition product inhibits Li+ insertion to electrodes, leading to poor cycling stability. To exert a potential of EMI-TFSA, we employed vinylene carbonate (VC) as film-forming additive. Si electrode exhibited very high cycling stability and rate capability in 20 volume% VC-added EMI-TFSA-based electrolyte. In addition, by replacing TFSA anion with bis(fluorosulfonyl)amide (FSA) for Li salt and ionic liquid solvent, an excellent cycling performance and outstanding rate capability was achieved. VC cannot only fabricate a good surface film but also lower the interaction between Li+ and FSA-, providing smooth desolvation of FSA- to obtain better high-rate performance. Non-flammability of the VC-added electrolytes was confirmed by fire resistance test in closed-system: no ignition was observed even at 300°C. Consequently, we found that mixture electrolyte consisted of EMI-based ionic liquid and VC, especially 1 M LiFSA/EMI-FSA with 20 volume% VC, is a prospective candidate for simultaneously enhancing the electrochem. performance of Si electrode as well as safety of LIBs. In the experiment, the researchers used many compounds, for example, Vinylene carbonate(cas: 872-36-6Electric Literature of C3H2O3)
Vinylene carbonate(cas: 872-36-6) belongs to esters. Alkyl carbonates find applications as solvents for lithium ion battery electrolytes and the use of high quality battery grade electrolytes having extremely low water (<10 ppm) and acid (<10 ppm) contents are critical for achieving high electrochemical performance.Electric Literature of C3H2O3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics