Source: http://www.freepatentsonline.com/y2008/0124605.html
Timestamp: 2020-05-27 13:45:18
Document Index: 551374647

Matched Legal Cases: ['art.\n3', 'art 22', 'art 21', 'art 23', 'art 21', 'art 22', 'art 23', 'art 22', 'art 23', 'art 21', 'art 22', 'art 21', 'art 22', 'art 21', 'art 22', 'art 21', 'art 22', 'art 22', 'art 23', 'art 22', 'art 23', 'art 21', 'art 22', 'art 23', 'art 41', 'art 42', 'art 41', 'art 42', 'art 41', 'art 42', 'art 41', 'art 42', 'art 41', 'art 42', 'art 41', 'art 42', 'art 42', 'art 42', 'art 42', 'art 41', 'art 42', 'art 41', 'art 41', 'art 42']

Solid Electrolyte And Manufacturing Method Of The Same - TOYOTA JIDOSHA KABUSHIKI KAISHA
Solid Electrolyte And Manufacturing Method Of The Same
United States Patent Application 20080124605
Nagasaka, Keisuke (Shizuoka-ken, JP)
Lijima, Masahiko (Saitama-ken, JP)
11/792115
205/333, 429/495, 429/523, 429/535
H01M8/10; C25D11/02
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20070020516 Foldable battery cartridge and middle or large-sized battery module January, 2007 Yoon
1. A solid electrolyte comprising: a metal part having hydrogen permeability; and a metal oxide part having proton conductivity, wherein: the metal part and the metal oxide part are formed integrally; the metal part borders on the metal oxide part; and a metal forming the metal part is the same as a metal forming the metal oxide part.
3. The solid electrolyte as claimed in claim 1, further comprising a second metal part having hydrogen permeability, wherein the second metal part, the metal part and the metal oxide part border in sequence.
4. A method of manufacturing a solid electrolyte comprising; providing a hydrogen permeable metal substrate that has a valve metal forming at least a part thereof; and forming subsequently a metal oxide part having proton conductivity by anodizing at least a part of the valve metal.
7. The method of manufacturing the solid electrolyte as claimed in claim 4, wherein: providing the hydrogen permeable metal substrate includes forming a valve metal part having hydrogen permeability on one face of the hydrogen permeable metal substrate; and forming the metal oxide part includes forming a metal oxide part having proton conductivity by anodizing the whole valve metal part.
FIG. 3 illustrates a schematic view of a solid electrolyte 100a in accordance with a second embodiment. As shown in FIG. 3, the solid electrolyte 100a may have a construction in which a valve metal part 22 is sandwiched between a solid electrolyte part 21 and a hydrogen permeable metal part 23. The solid electrolyte part 21, the valve metal part 22 and the hydrogen permeable metal part 23 may be formed integrally. The valve metal part 22 may be bonded metallurgically to the hydrogen permeable metal part 23.
In the solid electrolyte 100a in accordance with this embodiment, a boundary face formed at a boundary between the solid electrolyte part 21 and the valve metal part 22 is restrained, because the solid electrolyte part 21 and the valve metal part 22 are formed integrally. A peel strength between the solid electrolyte part 21 and the valve metal part 22 is thus increased. In addition, the interface strength between the solid electrolyte part 21 and the valve metal part 22 is increased, because the valve metal part 22 is bonded metallurgically to the hydrogen permeable metal part 23. The peel strength between the valve metal part 22 and the hydrogen permeable metal part 23 is thus increased.
FIGS. 4A-4D illustrate a method of manufacturing the solid electrolyte 100a. As shown in FIG. 4A, a hydrogen permeable metal substrate 30 may be provided. The hydrogen permeable metal substrate 30 may be formed of, for example, a metal like vanadium. Next, as shown in FIG. 4B, a valve metal layer 31 may be formed on one face of the hydrogen permeable metal substrate 30 by a sputtering method or the like. The valve metal layer 31 may be formed of a valve metal like tantalum. Then, as shown in FIG. 4C, an area neighboring one face of the valve metal layer 31 may be subjected to anodic oxidation treatment. The area may be thus oxidized. In this case, it is possible to oxidize the area neighboring the face of the valve metal layer 31 by masking a part except for a part to be subjected to the anodic oxidation treatment with a tape. As shown in FIG. 4D, the solid electrolyte part 21 and the valve metal part 22 may be formed from the valve metal layer 31. The hydrogen permeable metal part 23 may also correspond to the hydrogen permeable metal substrate 30. The solid electrolyte 100a may be fabricated through the operations mentioned-above.
FIG. 5 illustrates a schematic view of a solid electrolyte 199b in accordance with a third embodiment. As shown in FIG. 5, the solid electrolyte 100b may have a construction in which a solid electrolyte part 41 and a hydrogen permeable metal part 42 are formed integrally. The solid electrolyte part 41 may be formed of a metal oxide having proton conductivity. The hydrogen permeable metal part 42 may be formed of a hydrogen permeable metal. The metal forming the solid electrolyte part 41 may be the same as the metal forming the hydrogen permeable metal part 42. In this embodiment, tantalum oxide can be used for the solid electrolyte part 41 and palladium can be used for the hydrogen permeable metal part 42.
In the solid electrolyte 100b in accordance with this embodiment, a peel strength between the solid electrolyte part 41 and the hydrogen permeable metal part 42 is increased, because the solid electrolyte part 41 and the hydrogen permeable metal part 42 are formed integrally.
In addition, palladium can dissociate molecular hydrogen. The hydrogen permeable metal part 42 can also dissociate molecular hydrogen if palladium is used for the hydrogen permeable metal part 42. It is therefore not necessary to provide an anode when a fuel cell is produced. The manufacturing cost of the fuel cell including the solid electrolyte 100b can thus be reduced.
Further, a coefficient of hydrogen swell of tantalum is bigger than that of palladium. In the solid electrolyte 100b in accordance with this embodiment, no tantalum layer is formed between the hydrogen permeable metal part 42 and the solid electrolyte part 41. It is therefore prevented that a crack occurs between the hydrogen permeable metal part 42 and the solid electrolyte part 41.
FIGS. 6A-6D illustrate a method of manufacturing the solid electrolyte 100b. As shown in FIG. 6A, a hydrogen permeable metal substrate 50 may be provided. The hydrogen permeable metal substrate 50 may be formed of, for example, a metal like palladium or the like. Next, as shown in FIG. 6B, a valve metal layer 51 may be formed on one face of the hydrogen permeable metal substrate 50 by a sputtering method or the like. The valve metal layer 51 may be formed of a valve metal like tantalum or the like. Then, as shown in FIG. 6C, the whole valve metal layer 51 may be subjected to anodic oxidation treatment, and the all of the valve metal layer 51 may be oxidized anodically. In this case, it is possible to oxidize the whole valve metal layer 51 by masking the hydrogen permeable metal substrate 50 with a tape. As shown in FIG. 6D, the solid electrolyte part 41 may be formed from the valve metal layer 51. The hydrogen permeable metal part 42 may also correspond to the hydrogen permeable metal substrate 50. The solid electrolyte 100b may be fabricated through the operations mentioned-above.
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