Reduce the methanol permeability of hydrocarbon membranes have appeared
In January 19, 2005 Tokyo International Exhibition Center BigSight opening of the laptop battery "1st International Fuel Cell Exhibition", the approach can reduce the direct methanol fuel cell (DMFC) the phenomenon of widespread infiltration of methanol (methyl alcohol by the very side of fuel to the infiltration of the air side of the phenomenon of extremely) of hydrocarbon-type electrolyte membrane appeared one after another. It is understood that the Hitachi Chemical Industries, Japan and Germany Hill, Mitsui Chemical, Nitto Denko and synthesis in East Asia toshiba battery such electrolyte membrane exhibited.
Hitachi Chemical Industries of the film on display, compared to the last category of fluoride membrane, the methanol permeability reduced to 1 / 100 (Figure 1). At 30 ℃ for 10% concentration of methanol, the methanol permeability for 0.002kg m2 / h, and the fluorine-type membranes, compared with 0.6kg m2 / h. "Even at 60 ℃ can achieve the same level" (Hitachi Chemical Industry), membrane resistance (thickness divided by the proton conductivity) is also "slightly more than F-type membrane" (Hitachi Chemical Industry). The company originally envisaged for the use of the concentration of 10 ~ 20% of methanol, and the successful development of this film. However, the company said will continue to develop in order to achieve the use of methanol and water, such as grams of weight, that is, around 60% concentration of methanol, it was introduced at this time the most efficient use.
Japan and Germany show the membrane Hill, compared to fluorine-type membranes, methanol permeability can be reduced to 1 / 5 ~ 1 / 10. Film Resistors (3 mol / L of sulfuric acid when the exchange frequency of 1kHz resistance), the film thickness 30μm the "BCM-210" for 0.18Ω cm2, film thickness 32μm the "BCM-211" for 0.14Ω cm2. Proton conductivity and fluoride alleged essentially the same type of membrane. Mitsui Chemicals has also exhibited in relation to fluoride-type membrane, methanol permeability of about 1 / 10, the same proton conductivity of the aromatic hydrocarbon membrane. East Asia is also on display in the synthesis of polyolefin porous membrane filled with a hydrocarbon in the hydrocarbon electrolyte membrane, methanol permeability of the membrane for the fluorine-type 1 / 5 ~ 1 / 10.
Nitto Denko is a display by the F-type material and hydrocarbon material from the membrane complex. Fluoride-like materials by electron beam irradiation, so that at the turn of Union (Cross Linking). After electron beam irradiation, separation and hydrogen fluoride, together with the hydrocarbon material to sulfonation. Methanol concentration of 40% of the conditions, the methanol permeability of the membrane for the fluorine-type 1 / 5. Proton conductivity at this time with the same fluorine-type membranes.
In addition, Nitto Denko will also be on display as the East Asia as in the synthesis of porous-type vector paraffin hydrocarbon distribution of the electrolyte membrane electrolyte. Mainly used for this membrane-type solid polymer electrolyte fuel cell (PEFC), the penetration of hydrogen fluoride type film down to 1 / 6 of the following, but also to meet the requirements of DMFC electrolyte membrane. On the other hand, the above described hydrocarbon DMFC membrane can be used applied to PEFC, for example, Japan has launched Deshan material design using the same technology developed hydrocarbon toshiba tecra a7 battery, toshiba tecra s2 battery membrane with PEFC.
These hydrocarbon-type electrolyte membrane are lower than the cost It is learned that fluoride type film. When mass production, Hitachi Chemical, said, "To achieve fluoride membrane-type 1 / 10 or so," Hill said Japan and Germany, "F-type film about 1 / 5 or so, but is expected to down to 1 / 10 ~ 1 / 20." Nitto Denko said "the cost must be lower than the fluoride type film."
In order to improve the type of electrolyte membrane and electrode affinity binder in the electrode material, the mountain and Japan and Germany put forward a Mitsui Chemicals program using hydrocarbons. DMFC and PEFC electrodes will be a catalyst for the use of adhesives and supports (carbon) made of cement. However, if the adhesive between the electrolyte membrane with poor affinity, the adhesive will drop. The past, the electrolyte membrane electrode also as adhesives, usually used fluoride-like materials. Japan's Mitsui Chemicals and Tokuyama, taking into account of this affinity, the on proposed hydrocarbon binder
Etching method to produce fuel cell separators
A few days ago in the "First International Fuel Cell Exhibition" (January 19, 2005 ~ 21, Tokyo International Exhibition Center BigSight), the display processing technology using etching metal samples of the fuel cell separator. "Compared with the stamping process, the shape of flow more accurate way to raise about a few" (the company). Cost than the stamping process, but a shorter delivery time than the stamping process is more suitable for small batch production of small partitions.
Etching process, the thicker plate the greater the amount of etching, so not suitable for the production of a large partition. Therefore, the technology for notebook PC, mobile phone and other small partition production equipment. It is now more than Precision Industry Company Hirai trial related products.
In addition, the stamping process in a short period of time should be more. However, because the processing needs of stamping die, when in small batch production, but rather etching process can be delivered more quickly. It also depends on the costs of production scale, the use of smaller quantities etching processing, a greater use of time stamping die to create processing, can effectively reduce costs. Of course, also subject to other conditions, but in general, about 10,000 in the use of etching process, when more than this number of stamping process is used.
The new fuel cell mobile phone calls can be two hours watching TV
A display of staff on January 21 in Tokyo at the International Fuel Cell Expo to display KDDI and its fuel-cell phone batteries used in methanol solution. Cooperative R & D battery, according to Hitachi said that the dell battery, dell latitude d620 battery. The prototype cell phone talk time is about 2-3 hours while watching TV.
