Non-aqueous electrolytic solution, and electrochemical energy accumulating device using the same
A non-aqueous electrolyte and solvent technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte storage batteries, non-aqueous electrolytes, etc., can solve the problems not shown, reduce the amount of electrolyte, improve energy density, and resist oxidation. Excellent effect of resistance and reduction resistance
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Embodiment 1
[0061] By EC / LiBF 4 / TEA·BF 4 = 6 / 1 / 1 molar ratio mixed EC, LiBF 4 and TEA·BF 4. As a result, it was possible to prepare a single-phase electrolytic solution at room temperature with a total salt concentration of 2.4 mol / kg. In addition, it was confirmed visually that the undissolved salt was not floating or cloudy, but was transparent, so it was confirmed that the electrolytic solution was a single phase.
[0062] Press EC / TEA·BF 4 = Mix EC and TEA·BF at a molar ratio of 6 / 1 4 When, TEA·BF 4 Undissolved, floating on the upper surface of the solution. Here, if it is assumed that TEA·BF 4 If it is completely dissolved, an electrolyte solution with a salt concentration of 1.3 mol / kg can be obtained. From this we know that by the presence of LiBF 4 And make TEA · BF 4 It becomes easy to dissolve, and at the same time, the salt concentration in the electrolyte reaches at least 1.8 times.
Embodiment 2
[0064] Press γ-BL / LiBF 4 / TEA·BF 4 = 4 / 1 / 1 molar ratio mixed γ-BL, LiBF 4 and TEA·BF 4 After that, keep at 60°C. As a result, a single-phase electrolytic solution having a total salt concentration of 3.1 mol / kg could be prepared. In addition, press γ-BL / TEA·BF 4 = 4 / 1 molar ratio mixed γ-BL and TEA · BF 4 When, TEA·BF 4 It does not completely dissolve at 60°C and floats on the upper surface of the solution. Here, if it is assumed that TEA·BF 4 If all of them are dissolved, an electrolyte solution with a salt concentration of 1.8 mol / kg can be obtained. From this we know that by the presence of LiBF 4 And make TEA · BF 4 It becomes easy to dissolve, and at the same time, the salt concentration in the electrolyte reaches at least 1.7 times.
Embodiment 3
[0066] EC and LiBF were mixed in various ratios shown in Table 1 4 and TEMA·BF 4 . Table 1 shows the state of the electrolytic solution prepared at this time. In addition, compositions 1-1, 1-2, 1-8, and 1-9 are comparative examples.
[0067] Table 1
[0068]
[0069] Under the mixing conditions of the compositions 1-3 to 1-7, it is possible to prepare a high-ion-concentration electrolytic solution composed of a single phase at room temperature. Here, the molar ratio is EC / LiBF 4 / TEMA·BF 4 In the electrolytic solution of =2 / 1 / 1, the total salt concentration was 4.2 mol / kg. On the other hand, in the compositions 1-1, 1-2, 1-8, and 1-9, it was not possible to prepare a single-phase electrolytic solution at room temperature. In addition, by EC / LiBF 4 = 2 / 1 molar ratio mixed with EC and LiBF 4 When, and press EC / TEMA · BF 4 = 2 / 1 molar ratio mixed with EC and TEMA·BF 4 , the salt cannot be completely dissolved in EC.
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