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Rechargeable lithium battery using non-flammable electrolyte based on tetraethylene glycol dimethyl ether and olivine cathodes

Di Lecce, D; Carbone, L; Gancitano, V; Hassoun, J; (2016) Rechargeable lithium battery using non-flammable electrolyte based on tetraethylene glycol dimethyl ether and olivine cathodes. Journal of Power Sources , 334 pp. 146-153. 10.1016/j.jpowsour.2016.09.164. Green open access

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Abstract

We propose lithium metal cells employing LiCF₃SO₃ -tetraethylene glycol dimethy ether (TEGDME) electrolyte solution with LiFePO₄ and LiMn₀.₅Fe₀.₅PO₄ cathodes. The electrolyte is selected due to its non-flammability, herein demonstrated, and considered as a key requirement for application cells employing high energy lithium metal anode. The selected olivine cathodes, i.e., stable materials prepared by solvothermal pathway, have regular submicrometrical morphology suitable for cell operation and homogeneous composition, as confirmed by electron microscopy and energy dispersive X-ray spectroscopy. The electrochemical tests reveal promising cycling performances in terms of delivered capacity, stability and rate capability. The Li/LiCF₃SO₃-TEGDME/LiFePO₄ cell operates at 3.5 V with capacity ranging from 150 mAh g⁻¹ at C/10 to 110 mAh g⁻¹ at 2C, while the Li/LiCF₃SO₃-TEGDME/LiFe₀.₅Mn₀.₅PO₄ cell performs following two plateaus at 4.1 V and 3.5 V with capacity ranging from 160 mAh g⁻¹ at C/10 to 75 mAh g⁻¹ at 2C. Hence, the results demonstrate the suitability of TEGDME-based electrolytes in combination with LiFePO₄ and LiFe₀.₅Mn₀.₅PO₄ cathodes for high performances lithium battery.

Type: Article
Title: Rechargeable lithium battery using non-flammable electrolyte based on tetraethylene glycol dimethyl ether and olivine cathodes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jpowsour.2016.09.164
Publisher version: https://doi.org/10.1016/j.jpowsour.2016.09.164
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: Tetraethylene glycol dimethyl ether, Non-flammable electrolyte, Lithium metal, LiFePO₄, LiMn₀.₅Fe₀.₅PO₄
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/10062423
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