Ion-conductive composite electrolyte and membrane-electrode assembly using the same, electrochemical apparatus using the membrane-electrode assembly, and method for producing ion-conductive composite electrolyte membrane
A composite electrolyte membrane and composite electrolyte technology, used in solid electrolyte fuel cells, electrochemical generators, cable/conductor manufacturing, etc. The effect of methanol channeling
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Embodiment 1
[0228] Here, the above-mentioned fullerene derivatives are used as ion conductors. The effect of the interaction between this ionic conductor and various solvents will now be described.
[0229] The fullerene derivative was dispersed in various solvents, and then the solvent was removed from the resulting dispersion liquid by vacuum drying at 100°C. Subsequently, compacts are prepared. Each compact was sandwiched between gold electrodes, and its ionic conductivity σ was detected by using a complex impedance method. The measurement results are shown in Figure 9 . Note that these briquettes do not contain binder.
[0230] Figure 9 is a graph showing the effect of a solvent, which remains in a compact composed of a fullerene derivative, on ion conductivity in Examples of the present invention. exist Figure 9 In , the horizontal axis represents the donor number (DN) of the solvent, while the vertical axis represents the ionic conductivity σ(S / cm 2 ). The name of the so...
Embodiment 2
[0241] Here, a pitch material into which sulfonic acid groups are introduced (hereinafter referred to as "sulfonated pitch") is used as an ion conductor. The effect of the interaction between this ionic conductor and various solvents will now be described. The sulfonated pitch was synthesized as follows.
[0242] Coal tar (manufactured by Wako Pure Chemical Industries, Ltd., 10 g) was weighed in a round bottom flask, the inside of the flask was replaced with a nitrogen stream, the entire flask was immersed in an ice bath, and the flask was slowly stirred with a stirrer. While the flask was sufficiently immersed in an ice bath, 200 mL of 25% oleum (manufactured by Wako Pure Chemical Industries, Ltd.) was carefully added dropwise thereto so as not to generate heat. In addition, the flask was stirred vigorously at room temperature while being immersed in an ice bath. Three hours later, while the flask was submerged in an ice bath, ion-exchanged water (500 mL) was carefully adde...
Embodiment 3
[0253] Here, the above-mentioned fullerene derivatives are used as ion conductors. The influence of the solvent used in forming the electrolyte membrane containing the fullerene derivative will be described. As a solvent, GBL (γ-butyrolactone) was used, and an electrolyte membrane formed using DMF (dimethylformamide) was used as a comparative example.
[0254] The electrolyte membrane was prepared as follows. The fullerene derivative was added to γ-butyrolactone and dispersed under stirring for two hours. A PVdF-HFP copolymer (PVdF 90% by mole) and HFP 10% by mole) was added as a binder to the dispersion so that the content of the binder was 30% by weight, and γ-butyrolactone was added as needed. The mixture was stirred at 80° C. for more than three hours to uniformly disperse the fullerene derivative.
[0255] The dispersion liquid containing the fullerene derivative and the binder obtained in this way is spread uniformly on a substrate (glass is used, but polyimide film, ...
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Abstract
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