| 1. |
- Hosseini Bab Anari, Elham, 1982, et al.
(författare)
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Ionic liquid based battery electrolytes using lithium and sodium pseudo-delocalized pyridinium anion salts
- 2019
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Ingår i: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 21:33, s. 18393-18399
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Tidskriftsartikel (refereegranskat)abstract
- The electrolyte salt plays an important role for the overall performance and safety of lithium- and sodiumion batteries (LIBs and SIBs, respectively). Here, two new lithium and sodium pseudo-delocalized pyridinium anion based salts were used to prepare ionic liquid (IL) based electrolytes. The Li and Na salts of the 1-methylpyridinum 2,6-dicarboxylate anion (MM26py) were synthesized and dissolved in an IL matrix (Pyr14TFSI) – hence creating mixed anion electrolytes. The obtained electrolytes are stable up to 150 and 200 1C and show ion conductivities of 2.8 and 3.2 mS cm1 at room temperature, for the LIB and SIB electrolytes, respectively. A competitive effect between the MM26py and the TFSI anions to coordinate the alkali metal cations is observed. Finally, the electrochemical stability windows of 2.3 and 2.5 V, respectively, confirm that these electrolytes can be used practically in medium-voltage LIBs and SIBs.
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| 2. |
- Lindberg, Simon, 1985, et al.
(författare)
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Electrochemical Behaviour of Nb-Doped Anatase TiO2 Microbeads in an Ionic Liquid Electrolyte
- 2020
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Ingår i: Batteries and Supercaps. - : Wiley. - 2566-6223. ; 3:11, s. 1233-1238
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Tidskriftsartikel (refereegranskat)abstract
- TiO(2)is a promising material for high-power battery and supercapacitor applications. However, in general TiO(2)suffers from an initial irreversible capacity that limits its use in different applications. A combination of a microbead morphology, Nb-doping, and the use of an ionic liquid electrolyte is shown to significantly decrease the irreversible capacity loss. A change in the electrochemical response in the first cycles indicates formation of a solid-electrolyte interphase (SEI) or a modification of the structure of the surface layer of the TiO2/Nb microbeads, which apparently stabilises the performance. The change in the response is manifested in an increased charge transfer resistance and the presence of two charge transfer contributions. During prolonged cycling the TiO2/Nb electrode shows an excellent stability over 5000 cycles. Ex situ analysis after cycling shows that the overall microbead morphology is intact and that there are no changes in the crystal structure. However, a decrease in the intensity of the XRD pattern can point to a decrease in size of the nanocrystals building up the microbeads or the formation of amorphous phases.
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| 3. |
- Navarro Suárez, Adriana, 1983, et al.
(författare)
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A Silatrane:Molecule-Based Crystal Composite Solid-State Electrolyte for All-Solid-State Lithium Batteries
- 2019
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Ingår i: Batteries and Supercaps. - : Wiley. - 2566-6223. ; 2:11, s. 956-962
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Tidskriftsartikel (refereegranskat)abstract
- All-solid-state batteries (ASSBs) are promoted as a promising option towards higher energies and power densities as well as drastically reduced safety risks as compared to conventional lithium-ion batteries (LIBs). Herein, a composite solid-state electrolyte (SSE) based on two crystalline materials with two distinctly different ion conduction mechanisms, percolation and ion hopping, is reported. By combining a silatrane (SA; here ethoxysilatrane) with a molecule-based crystal (MBC; here LiTFSI-TMEDA) the resulting SA : MBC 2 : 1 crystalline composite shows an appreciable ion conductivity of 10(-5) S cm(-1) at room temperature, and low apparent activation energy, 836 K, for the ion transport. Studies of the overall and local structure show that in the composite the Li+ and TFSI ions are dissociated, and this seems to be mediated by the SA part of the matrix. As a proof-of-concept, an ASSB based on this SSE can operate at 50 degrees C providing up to 105 mAh g(-1) during 20 cycles.
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| 4. |
- Navarro Suárez, Adriana, 1983, et al.
(författare)
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Perspective-Semi-Solid Electrolytes Based on Deep Eutectic Solvents: Opportunities and Future Directions
- 2020
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Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 1945-7111 .- 0013-4651. ; 167:7
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Forskningsöversikt (refereegranskat)abstract
- In the past years the interest in deep eutectic solvents (DESs) has been steadily increasing, much due to the possibilities to rationally design their special physical properties by choosing the right combination of components. This perspective aims to help unifying how deep eutectic solvents should be reported and explores the vast opportunities for semi-solid electrolytes based on DESs. The latter connects well to the trend on research towards solid-state energy storage devices, emphasizing the aim of increased safety.
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