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Ion speciation and transport properties of LiTFSI in 1,3-dioxolane solutions: A case study for Li–S battery applications

Ion speciation and transport properties of LiTFSI in 1,3-dioxolane solutions: A case study for Li–S battery applications
Ion speciation and transport properties of LiTFSI in 1,3-dioxolane solutions: A case study for Li–S battery applications
The Lithium–Sulfur battery is considered to be one of the main candidates for the “post-lithium-ion” battery generation, because of its high theoretical specific capacity and inherently low cost. The role of the electrolyte is particularly important in this system and remarkable battery performances have been reported by tuning the amount of salt in the electrolyte. To further understand the reasons for such improvements we chose the lithium bis(trifluoromethanesulfonyl)imide in 1,3-dioxolane electrolyte as a model salt-solvent system for a systematic study of conductivity and viscosity over a wide range of concentration from 10-5 up to 5 molal. The experimental results, discussed and interpreted with reference to the theory of electrolyte conductance, lead to the conclusion that triple ions formation is responsible for the highest molal conductivity values before reaching the maximum at 1.25 molal. At higher concentrations, the molal conductivity drops quickly due to a rapid increase in viscosity and the salt–solvent system can be treated as a diluted form of molten salt.
1520-5207
Raccichini, Rinaldo
7f943ecf-6b1b-4e4a-b222-8f3c27e679df
Dibden, James, William
0a189dfc-bdec-48fa-ba0f-c1d8dcaddcc2
Brewer, Ashley
d10b9ab3-b920-498b-8a3c-b4b5d16106e5
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Raccichini, Rinaldo
7f943ecf-6b1b-4e4a-b222-8f3c27e679df
Dibden, James, William
0a189dfc-bdec-48fa-ba0f-c1d8dcaddcc2
Brewer, Ashley
d10b9ab3-b920-498b-8a3c-b4b5d16106e5
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37

Raccichini, Rinaldo, Dibden, James, William, Brewer, Ashley, Owen, John R. and Garcia-Araez, Nuria (2017) Ion speciation and transport properties of LiTFSI in 1,3-dioxolane solutions: A case study for Li–S battery applications. The Journal of Physical Chemistry B. (doi:10.1021/acs.jpcb.7b09614).

Record type: Article

Abstract

The Lithium–Sulfur battery is considered to be one of the main candidates for the “post-lithium-ion” battery generation, because of its high theoretical specific capacity and inherently low cost. The role of the electrolyte is particularly important in this system and remarkable battery performances have been reported by tuning the amount of salt in the electrolyte. To further understand the reasons for such improvements we chose the lithium bis(trifluoromethanesulfonyl)imide in 1,3-dioxolane electrolyte as a model salt-solvent system for a systematic study of conductivity and viscosity over a wide range of concentration from 10-5 up to 5 molal. The experimental results, discussed and interpreted with reference to the theory of electrolyte conductance, lead to the conclusion that triple ions formation is responsible for the highest molal conductivity values before reaching the maximum at 1.25 molal. At higher concentrations, the molal conductivity drops quickly due to a rapid increase in viscosity and the salt–solvent system can be treated as a diluted form of molten salt.

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LiTFSI-DOL Manuscript - Main Text - R01_Final---PLAIN_R02 - Accepted Manuscript
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Accepted/In Press date: 11 December 2017
e-pub ahead of print date: 27 December 2017

Identifiers

Local EPrints ID: 416843
URI: https://eprints.soton.ac.uk/id/eprint/416843
ISSN: 1520-5207
PURE UUID: 06192fae-55d2-4e1a-abe5-4a5ad0f7b689
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379

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Date deposited: 11 Jan 2018 17:30
Last modified: 17 Sep 2019 04:29

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