Insights into the structure and ionic transport in ‘water-in-bisalt’ electrolytes for lithium-ion batteries

Kartha, Thejus R. and Reddy, Dhileep N. and Mallik, Bhabani Shankar (2021) Insights into the structure and ionic transport in ‘water-in-bisalt’ electrolytes for lithium-ion batteries. Materials Advances, 2 (23). pp. 7691-7700. ISSN 2633-5409

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Abstract

We investigated the dynamics and transport of lithium-ion water-in-bisalt (WiBS) electrolytes that contain lithium bis(trifluorosulfonimide) (LiTFSI) and lithium triflate (LiOTf) at different concentrations and temperatures using classical molecular dynamics simulations. The presented results are helpful to access the advantages of their use as electrolytes in Li-ion batteries. The structural analysis shows that the Li-ions have analogous interactions with the oxygen atoms of TFSI, OTf- and water. The calculated ionic conductivities from the current autocorrelation function are close to the experimental data for all the concentrations except the lowest one, in which case, the correlated conductivity is close to the experiment. However, the Nernst-Einstein route for calculating ionic conductivity overestimates the values by a reasonably high margin. Ion-cage correlation dynamics show increasing ion-cage lifetimes with increasing concentration, which indicates that the Li-ions remain within the anionic cages for a longer time at higher concentrations. At higher temperatures, this lifetime is seen to decrease. The statistics of non-coordinated Li-ions that are free from TFSI- and OTf- support the ion-cage dynamics. This journal is © The Royal Society of Chemistry.

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IITH Creators:

IITH Creators	ORCiD
Mallik, Bhabani Shankar	http://orcid.org/0000-0001-9657-1497

Item Type:

Article

Additional Information:

The financial support (DST/NSM/R&D_HPC_Applications/Sanction/ 2021/06) for this work was provided by the National Supercomputing Mission (NSM), India.

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

. LibTrainee 2021

Date Deposited:

01 Sep 2022 04:26

Last Modified:

01 Sep 2022 04:26

URI:

http://raiithold.iith.ac.in/id/eprint/10356