Document Type
Article
Date of Original Version
4-2-2020
Department
Chemistry
Abstract
The synthesis, spectroscopic and electrochemical characterization of Li[N(SiMe3)(SO2RF)] (RF=CF3, n‐C4F9) as well their behavior as electrolyte additive in lithium ion batteries (LIBs) is reported. The lithium salts were obtained by deprotonation of the corresponding acids HN(SiMe3)(SO2RF) with n‐butyllithium in n‐pentane. The electrochemical investigations suggested potential as additives for LIBs. Thus, NCM111/graphite cells (NCM111=Li[Ni0.33Co0.33Mn0.33]O2) with LP57 as electrolyte (LP57=1.0 M LiPF6 in EC/EMC 3 : 7) were built to test the performance. Cells with Li[N(SiMe3)(SO2RF)] as additives show coulombic efficiencies of over 99.6 %, less capacity fading over 55 cycles and a significantly lower cell impedance built up.
Citation/Publisher Attribution
Weigel, S., Eisele, L., Klose, P., Lucht, B., Beichel, W. and Krossing, I. (2020), Asymmetric Imides as Electrolyte Additive for Lithium Ion Batteries with NCM111 Cathode. ChemElectroChem 2020, 7, 2107. doi:10.1002/celc.202000277
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License