Molten salt electrolyte and sodium molten salt battery
A molten salt electrolyte, sodium salt technology, used in molten electrolytes, organic electrolytes, non-aqueous electrolytes, etc.
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Embodiment 1
[0103] (production of positive electrode)
[0104] By adding 85 parts by mass of NaCrO with an average particle size of 10 μm 2 (positive electrode active material), 10 mass parts of acetylene black (conductive carbon material) and 5 mass parts of PVDF (binder) were dispersed in N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare the positive electrode slurry. The obtained positive electrode slurry was applied to one surface of an aluminum foil having a thickness of 20 μm, dried, and rolled, and cut into a predetermined size. Thus, a positive electrode including a positive electrode active material layer having a thickness of 80 μm was manufactured. The positive electrode was punched into a coin shape with a diameter of 12 mm.
[0105] (manufacture of negative electrode)
[0106] Metallic sodium having a thickness of 100 μm was attached to one surface of an aluminum foil having a thickness of 20 μm to fabricate a negative electrode. The negative electrode was p...
Embodiment 2
[0128] The molten salt electrolyte A2 was prepared, and the molten salt electrolyte A2 was obtained from commercially available sodium bis(trifluoromethylsulfonyl)imide (Na TFSI: sodium salt) and commercially available 1 -Methyl-1-propylpyrrole Composition of a mixture of bis(trifluoromethylsulfonyl)imide (MPPY·TFSI: ionic liquid).
[0129] The impurities in molten salt electrolyte A2 were detected by ICP, ion chromatography, IR analysis and NMR analysis. From the results, the presence or absence of impurities could not be confirmed. On the other hand, according to the measurement results of the UV-Vis absorption spectrum of the molten salt electrolyte A2, a clear peak attributable to impurities was observed in the wavelength range of 200 to 500 nm, although its intensity was weak.
[0130] Next, MPPYTFSI was purified by passing through a column filled with activated alumina and then mixed with NaTFSI. Thus, molten salt electrolyte B2 composed of a mixture of MPPYTFSI and ...
Embodiment 3
[0141] Prepare molten salt electrolyte A3, which is composed of commercially available sodium bis(fluorosulfonyl)imide (Na·FSI: sodium salt) and commercially available 1-methyl -1-Butylpyrrole Composition of a mixture of bis(fluorosulfonyl)imide (MBPY·FSI: ionic liquid).
[0142] The impurities in molten salt electrolyte A3 were detected by ICP, ion chromatography, IR analysis and NMR analysis. From the results, the presence or absence of impurities could not be confirmed. On the other hand, according to the measurement results of the UV-Vis absorption spectrum of the molten salt electrolyte A3, a clear peak attributed to impurities was observed in the wavelength range of 200 to 500 nm, although its intensity was weak.
[0143] Next, the MBPYFSI is purified by passing it through a column filled with activated alumina and then mixed with NaFSI. Thus, molten salt electrolyte B3 composed of a mixture of MBPYFSI and NaFSI at a molar ratio of 90:10 was prepared.
[0144] Accor...
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Abstract
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