Complex Ion Dynamics in Carbonate Lithium-Ion Battery Electrolytes
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
Li-ion battery performance is strongly influenced by ionic conductivity, which depends on the mobility of the Li ions in solution, and is related to their solvation structure. In this work, we have performed first-principles molecular dynamics (FPMD) simulations of a LiPF6 salt solvated in different Li-ion battery organic electrolytes. We employ an analytical method using relative angles from successive time intervals to characterize complex ionic motion in multiple dimensions from our FPMD simulations. We find different characteristics of ionic motion on different time scales. We find that the Li ion exhibits a strong caging effect due to its strong solvation structure, while the counterion, PF6– undergoes more Brownian-like motion. Lastly, our results show that ionic motion can be far from purely diffusive and provide a quantitative characterization of the microscopic motion of ions over different time scales.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1375301
- Report Number(s):
- LLNL-JRNL-674755
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 121, Issue 12; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Structure and dynamics in the lithium solvation shell of nonaqueous electrolytes
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journal | April 2019 |
An ab initio molecular dynamics study of the solvation structure and ultrafast dynamics of lithium salts in organic carbonates: A comparison between linear and cyclic carbonates
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journal | May 2019 |
Boosting Rechargeable Batteries R&D by Multiscale Modeling: Myth or Reality?
|
journal | March 2019 |
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