| 1. |
- Josef, Elinor, et al.
(författare)
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Ionic Liquids and Their Polymers in Lithium-Sulfur Batteries
- 2019
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Ingår i: Israel Journal of Chemistry. - : Wiley. - 0021-2148 .- 1869-5868. ; 59:9, s. 832-842
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Forskningsöversikt (refereegranskat)abstract
- Future optimized lithium-sulfur batteries may promise higher energy densities than the current standard. However, there are many barriers which hinder their commercialization. In this review we describe how ionic liquids (ILs) and their polymers are utilized in different components of the battery to address some of these issues. For example, IL-based electrolytes have the potential to reduce the solubility of polysulfides compared to conventional organic electrolytes. Polymerizing ILs directly on the surface of the Li-metal anode is suggested as an approach to protect the surface of this electrode. Finally, using poly(ionic liquids) (PILs) as binders for the cathode active material may increase the performance of the cathode as compared to polyvinylidene difluoride (PVdF) and could inhibit swelling-induced degradation. These results demonstrate the advantages of ILs and their polymers for improving the performance of Li−S batteries.
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| 2. |
- Yan, Yajing, 1990, et al.
(författare)
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Investigating discharge performance and Mg interphase properties of an Ionic Liquid electrolyte based Mg-air battery
- 2017
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Ingår i: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 235, s. 270-279
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Tidskriftsartikel (refereegranskat)abstract
- The performance of a primary Mg-air cell was evaluated at room temperature using a 72 mol% ethylene glycol/trihexyl(tetradecyl) phosphonium chloride ([P-6,P-6,P-6,P-14][Cl]) ionic liquid (IL) electrolyte. The cell was cycling in ambient air as well as in the presence of pure oxygen, and interestingly the cell presented much higher discharge capacity in air than in oxygen, which was attributed to the effect of water in the ambient air. When operated in ambient air, the cell showed promising discharge behaviour with a maximum rate of 0.2 mA cm(-2) and a discharge capacity of around 4.8 mAh cm(-2). When operated at a low rate 0.0075 mA cm(-2), the cell lasted for over 260 h, 10 days, at a potential above 1.3 V. Thus, the main focus of this study is the analysis of the mechanism of discharge capacity loss in this electrolyte, which revealed that, both the polarization due to the presence of a resistive Mg interphase on the anode surface and, concentration polarization due to the quick accumulation of Mg2+ ions in the IL based electrolyte are responsible. In-depth surface characterization suggested the discharge products accumulated on the Mg surface with a proposed formula [P6,6,6,14].Cl.Mg(OH)(2).9[Mg(OCH2CH2OH)Cl]. 40H(2)O most likely had a highly-crosslinked chemical structure, which were responsible for the limited ionic conductivity of the Mg interphase.
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