| 1. |
- Agostini, M., et al.
(författare)
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Polysulfide-containing Glyme-based Electrolytes for Lithium Sulfur Battery
- 2015
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 1520-5002 .- 0897-4756. ; 27:13, s. 4604-4611
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Tidskriftsartikel (refereegranskat)abstract
- A new comparative investigation of lithium sulfur cells employing a tetraethylene glycol dimethyl ether-lithium trifluoromethanesulfonate (TEGDME-LiCF3SO3) electrolyte charged by various polysulfide species (Li2S2, Li2S4, Li2S6, and Li2S8) is here reported. We carefully detect the effects of lithium polysulfide addition by originally combining X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The measurements clearly reveal how the polysulfide addition affects the nature and composition of the solid electrolyte interphase (SEI) in terms of precipitated S-based species determined by XPS. The study demonstrates that the SEI layer formed on the Li anode decreases in impedance and stabilizes by the presence of polysulfide. This, together with a buffer effect strongly mitigating the sulfur-cathode dissolution and the shuttle reaction, significantly improves the stability of the lithium-sulfur cell. The data here reported clearly suggest the polysulfide as an effective additive to enhance the performance of the lithium-sulfur battery (Graph Presented).
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| 2. |
- Carbone, Lorenzo, et al.
(författare)
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Carbon Composites for a High-Energy Lithium–Sulfur Battey with a Glyme-Based Electrolyte
- 2017
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Ingår i: ChemElectroChem. - : Wiley. - 2196-0216. ; 4:1, s. 209-215
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Tidskriftsartikel (refereegranskat)abstract
- A comparative study of sulfur composites using carbon of various natures, namely, graphite, mesocarbon microbeads, and multi-walled carbon nanotubes, is performed in lithium battery design and evaluation. Morphological and structural analyses, by means of SEM and XRD, cyclic voltammetry and galvanostatic cycling in lithium cells are employed for characterization of the materials. Tetraethylene glycol dimethyl ether containing lithium trifluoromethansulfonate is considered the preferred electrolyte for performing the electrochemical tests. Prior to use in cells, the electrolyte characteristics in terms of 1H, 7Li, and 19F nuclei self-diffusion coefficients, ionic conductivity, and ionic association degree are studied by combining NMR and impedance spectroscopy. The best lithium–sulfur composite reported herein achieves a capacity higher than 500 mAh g?1 over 140 cycles with no sign of dendrite formation or failure. This performance is considered sufficiently suitable for the development of high-energy lithium batteries, in particular, considering the expected safety of the cells by employing a nonflammable glyme electrolyte instead of a conventional carbonate-based one.
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| 3. |
- Lombardo, L., et al.
(författare)
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In-situ gelled electrolyte for lithium battery: Electrochemical and Raman characterization
- 2014
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Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753. ; 245, s. 232-235
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Tidskriftsartikel (refereegranskat)abstract
- n this paper we report a polymer lithium cell using a PVdF-based, gel-type electrolyte formed in-situ during cell assembly. The gel electrolyte formation is monitored prior to cell assembly by electro-chemical impedance spectroscopy and by Raman spectroscopy in order to determine the characteristics of the lithium salt diffusion into the gel-membrane. The results show an efficient gel formation and a fast lithium salt diffusion, this finally resulting in an optimized behaviour in a lithium cell using a high voltage spinel-type cathode. We believe that the results here reported may contribute to the enhancement of the safety of lithium batteries. (C) 2013 Elsevier B.V. All rights reserved.
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| 4. |
- Ulissi, U., et al.
(författare)
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All solid-state battery using layered oxide cathode, lithium-carbon composite anode and thio-LISICON electrolyte
- 2016
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Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738. ; 296, s. 13-17
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Tidskriftsartikel (refereegranskat)abstract
- The investigation of a lithium-carbon composite (Li-C) anode for application in all-solid-state battery, based on (Li2S)(0.75)-(P2S5)(0.25) glassy thio-LISICON electrolyte (Li2S-P2S5) is herein reported. The Li-C anode material is prepared by a mechanochemical, single step synthesis procedure. The Li-C/electrolyte interface is characterized in terms of cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic cycling in comparison with lithium metal, in order to evaluate the improvements in terms of resistance and lithium stripping deposition ability. Li-C anode powder is pressed into a pellet together with the Li2S-P2S5 electrolyte and Li2ZrO3-coated, Li[Ni0.8Co0.15Al0.05]O-2 cathode powder (NCA-LZO), to form a new type of solid-state battery operating at room temperature. The Li-C/Li2S-P2S5/NCA-LZO battery shows remarkable cycling performance under galvanostatic conditions, particularly if compared to a more conventional configuration employing lithium metal as the anode. In addition, the all solid-state battery is characterized at various current densities, showing satisfactory rate capability. Under long term-cycling condition, performed at low current and prolonged to more than 250 days, the cell shows a stability over 100 cycles without fading. This is considered a remarkable result suggesting the solid-state cell here studied as suitable candidate-for efficient and safe energy storage.
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