Journal
ELECTROCHEMISTRY
Volume 80, Issue 1, Pages 18-25Publisher
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.80.18
Keywords
Electrolytes; Anion Stability; DFT; Ab Initio
Categories
Funding
- Swedish Research Council (VR)
- Swedish Energy Agency (STEM)
- FORMAS
Ask authors/readers for more resources
New lithium imide salts have been studied using computational chemistry methods. Intrinsic anion oxidation potentials and ion pair dissociation energies are presented for six lithium sulfonyl imides (R-O2S-N-SO2-R) and six lithium phosphoryl imides (R-2-OP-N-PO-R-2), as a function of -F, -CF3, and -C N substitution. The modelled properties are used to estimate the electrochemical oxidation stability of the anions and the relative ease of charge carrier creation in lithium battery electrolytes. The results show that both properties are improved with cyano-substitution, which in part is corroborated when comparing with other classes of lithium salts. However, the comparison also shows ambiguous oxidation stability results for cyano-substituted reference salts of the type PFx(CN)((6) over bar -x) and BFx(CN)((4) over bar -x), using two different approaches - we present a tentative explanation for this. For the imide anions and PF6-, the bond dissociation energy is introduced as a third property, to gauge the thermal stability of the imide anions. The results suggest that the C-S and C-P bonds are the most liable to break and that the thermal stability is inversely related to the ion pair dissociation energy. (C) The Electrochemical Society of Japan, All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available