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Dataset for Development of Analytical Techniques for Lithium-Sulfur Batteries

Dataset for Development of Analytical Techniques for Lithium-Sulfur Batteries
Dataset for Development of Analytical Techniques for Lithium-Sulfur Batteries
Dataset supports: Liam Michael Furness (2020) Thesis. Development of Analytical Techniques for Lithium-Sulfur Batteries. University of Southampton. The aim of this study is to develop analytical techniques that can be used to better understand the lithium-sulfur (Li-S) battery system. The first technique involves the determination of the total atomic sulfur content and the average polysulfide chain length of a polysulfide solution. These experiments elucidated the 2-phase boundaries and eutonic point, giving an accurate representation of the ternary (lithium sulfide-sulfur-electrolyte) phase diagram. The 2-phase boundary describes the maximum solubility of a polysulfide solution in contact with either solid lithium sulfide or solid sulfur. On the other hand, the eutonic point describes the maximum solubility of a polysulfide solution in contact with both solid lithium sulfide and solid sulfur, thus the concentration of polysulfide species at the eutonic point is the maximum that can be achieved. The saturation concentration of polysulfide species will depend on the nature of the solvent and the lithium salt, and these variables can be tuned to improve the Li-S battery performance. This was observed when increasing the electrolyte salt concentration which limited the polysulfide solubility and in turn improved the cyclability of the Li-S battery. Therefore, the composition of the ternary phase diagram can be implemented to explain changes in Li-S battery galvanostatic cycling performance. The second technique, electrochemical impedance spectroscopy, will give further insight to the Li-S battery system. This technique, initially developed from Lasia et al. to determine the electroactive surface area of catalysts, has been applied to the cathode formulations for Li-S batteries in this study.1 Starting with the impedance of the basic components in a Li-S battery to understand features on the Nyquist plot. The complexity of cell setup was increased until the impedance of a full Li-S battery was achieved. This method allows determination of the specific surface area of different Li-S battery cathode formulations whilst also studying how the specific surface area of an electrode changes during galvanostatic cycling.
University of Southampton
Furness, Liam
2c50e6af-80f2-40d4-8aca-59843b79b6c1
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Owen, John
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Furness, Liam
2c50e6af-80f2-40d4-8aca-59843b79b6c1
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Owen, John
067986ea-f3f3-4a83-bc87-7387cc5ac85d

Furness, Liam (2021) Dataset for Development of Analytical Techniques for Lithium-Sulfur Batteries. University of Southampton doi:10.5258/SOTON/D1640 [Dataset]

Record type: Dataset

Abstract

Dataset supports: Liam Michael Furness (2020) Thesis. Development of Analytical Techniques for Lithium-Sulfur Batteries. University of Southampton. The aim of this study is to develop analytical techniques that can be used to better understand the lithium-sulfur (Li-S) battery system. The first technique involves the determination of the total atomic sulfur content and the average polysulfide chain length of a polysulfide solution. These experiments elucidated the 2-phase boundaries and eutonic point, giving an accurate representation of the ternary (lithium sulfide-sulfur-electrolyte) phase diagram. The 2-phase boundary describes the maximum solubility of a polysulfide solution in contact with either solid lithium sulfide or solid sulfur. On the other hand, the eutonic point describes the maximum solubility of a polysulfide solution in contact with both solid lithium sulfide and solid sulfur, thus the concentration of polysulfide species at the eutonic point is the maximum that can be achieved. The saturation concentration of polysulfide species will depend on the nature of the solvent and the lithium salt, and these variables can be tuned to improve the Li-S battery performance. This was observed when increasing the electrolyte salt concentration which limited the polysulfide solubility and in turn improved the cyclability of the Li-S battery. Therefore, the composition of the ternary phase diagram can be implemented to explain changes in Li-S battery galvanostatic cycling performance. The second technique, electrochemical impedance spectroscopy, will give further insight to the Li-S battery system. This technique, initially developed from Lasia et al. to determine the electroactive surface area of catalysts, has been applied to the cathode formulations for Li-S batteries in this study.1 Starting with the impedance of the basic components in a Li-S battery to understand features on the Nyquist plot. The complexity of cell setup was increased until the impedance of a full Li-S battery was achieved. This method allows determination of the specific surface area of different Li-S battery cathode formulations whilst also studying how the specific surface area of an electrode changes during galvanostatic cycling.

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Thesis_Dataset_readme.txt - Text
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Thesis_Chapter_2_Figures_and_Tables.xlsx - Dataset
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More information

Published date: 12 November 2021

Identifiers

Local EPrints ID: 445173
URI: http://eprints.soton.ac.uk/id/eprint/445173
PURE UUID: 168b663a-a3b6-498c-a41f-c0e1459d3bc6
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379
ORCID for John Owen: ORCID iD orcid.org/0000-0002-4938-3693

Catalogue record

Date deposited: 24 Nov 2020 17:33
Last modified: 18 Feb 2021 17:21

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Contributors

Creator: Liam Furness
Research team head: Nuria Garcia-Araez ORCID iD
Research team head: John Owen ORCID iD

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