Di Lecce, D;
Marangon, V;
Benitez, A;
Caballero, A;
Morales, J;
Rodríguez-Castellón, E;
Hassoun, J;
(2019)
High capacity semi-liquid lithium sulfur cells with enhanced reversibility for application in new-generation energy storage systems.
Journal of Power Sources
, 412
pp. 575-585.
10.1016/j.jpowsour.2018.11.068.
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Di Lecce_High capacity semi-liquid lithium sulfur cells with enhanced reversibility for application in new-generation energy storage systems_AAM.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Semi-liquid configuration of sulfur cell is proposed as simple strategy to develop high-energy lithium battery. Two solutions of Li₂S₈ in diethylene glycol dimethyl ether (DEGDME), containing either lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) or lithium trifluoromethansulfonate (LiCF₃SO₃) and lithium nitrate (LiNO₃), are studied as catholytes for Li/S cells exploiting the polysulfides electrochemical reaction at about 2.2 V vs. Li⁺/Li. X-ray photoelectron spectroscopy (XPS) and thermal analyses, respectively, reveal composition and high-temperature stability of the catholyte solutions. Ad hoc study conducted by impedance spectroscopy, voltammetry, and galvanostatic techniques suggests well suitable characteristics in terms of Li⁺-transport ability, electrochemical stability window, and electrode/electrolyte interphase features. Cells with sulfur loading ranging from about 3 to 6 mg cm⁻² into the solution are successfully studied with remarkable performances in terms of current rates, efficiency and cycle life. Hence, the lithium cells based on the catholyte deliver maximum capacity of the order of 1100 mAh gs⁻¹ at C/10 rate and stable capacity of about 800 mAh gs⁻¹ at C/3 rate with Coulombic efficiency exceeding 99%. Therefore, the catholyte solutions studied herein are considered as a very promising candidates for high-energy storage in next generation systems, such as the intriguing hybrid and electric vehicles.
| Type: | Article |
|---|---|
| Title: | High capacity semi-liquid lithium sulfur cells with enhanced reversibility for application in new-generation energy storage systems |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jpowsour.2018.11.068 |
| Publisher version: | https://doi.org/10.1016/j.jpowsour.2018.11.068 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Catholyte polysulfide, Lithium-sulfur battery, X-ray photoelectron spectroscopy, LiTFSI, LiCF₃SO₃, DEGDME |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10071796 |
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