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Design and Development of Lithium-Sulphur Batteries: Operando Studies using X-ray Absorption Spectroscopy

Yokota, Nanami (2018) Design and Development of Lithium-Sulphur Batteries: Operando Studies using X-ray Absorption Spectroscopy. Doctor of Philosophy (PhD) thesis, University of Kent,. (KAR id:73374)

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Abstract

Advanced power sources are urgently needed to meet the ever-increasing demand of modern society, especially battery requirements for extended-range electric vehicles and grid energy storage applications. [1] However, current rechargeable lithium-ion batteries are not able to fulfil the demand for future energy demands.

Herein, an operando XAS technique is employed to gain deep insights into the mechanism of Li-S cell reaction. This measurement technique offers the advantage to be element specific that is sensitive to oxidation states and chemical bonding of the atoms of interest. XAS in the S K-edge region is a powerful tool for the detection of the reaction product of Li-S batteries. The fingerprint analysis consisting of a comparison of XAS spectra between different sulphur species and measured data is helpful for distinguishing different species exist in the cell during the battery operation.

The objective of chapter 3 was to investigate the differences in the sulphur reaction mechanisms in variation of the electrolyte compositions including Li salts, solvent systems, and LiNO3 additive. The S K-edge XANES measurements demonstrated that the electrolyte compositions influence the self-discharge rate and the conversion reaction mechanisms of sulphur chemistry.

Chapter 5 demonstrates the environmentally friendly and cost-effective fabrication method of sulphur electrodes. Potential hazardous material is eliminated from the sulphur electrode system and replaced with conductive polymers, PANI and PEDOT:PSS, and their cell performances were investigated using operando XAS technique.

Item Type: Thesis (Doctor of Philosophy (PhD))
Thesis advisor: Alfredsson, Maria
Uncontrolled keywords: Li-S battery, X-ray Absorption Spectroscopy, Operando characterisation
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
SWORD Depositor: System Moodle
Depositing User: System Moodle
Date Deposited: 04 Apr 2019 12:12 UTC
Last Modified: 06 May 2020 03:19 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/73374 (The current URI for this page, for reference purposes)
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