Base material for a fuel battery

Chemistry: electrical current producing apparatus – product – and – Having earth feature

Reexamination Certificate

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Details

C429S047000

Reexamination Certificate

active

06207314

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a base material for a fuel battery.
BACKGROUND OF THE INVENTION
An example of a conventionally used technique is shown in FIG.
1
. Abase tube (base material portion)
1
according to prior art comprises a porous tube composed of 30.0 wt. % of CaO and 70.0 wt. % of ZrO
2
. On the surface of the base tube (base material portion)
1
, there are laminated a 100 &mgr;m thick fuel electrode-side electrode
2
comprising Ni-zirconia thermit, a 100 &mgr;m thick electrolyte
3
comprising yttrium-stabilized zirconia (“YSZ”), and a 100 &mgr;m thick air-side electrode
4
comprising LaMnO
3
doped with Sr in a proportion of 0.1. Further, a conductive connecting material
5
comprising LaCrO
3
is laminated for connecting the fuel electrode-side electrode
2
with the air-side electrode
4
to form a solid oxide fuel cell (“SOFC”); hereinafter referred to as “a fuel cell”; multiple fuel cells are connected to form a device hereinafter referred to as a “fuel battery”.
However, the base tube according to the earlier technology poses the problem of degrading markedly at a fast temperature raising and lowering rates during a heat cycle. In detail, with a temperature raising and lowering rate of not higher than 50° C./hour, the performance of the cell after the heat cycle does not differ from its performance before the heat cycle. At a temperature raising and lowering rate in excess of 50° C./hour, on the other hand, an output drop of about 10% may occur per heat cycle. When fuel cells are used as a gathering, a temperature raising and lowering rate, if not made very slow, exceeds 50° C./hour in a part of the fuel cell gathering, thereby damaging the cell. Thus, there is a demand for a cell which is not damaged even at a high temperature raising and lowering rate of about 200° C./hour.


REFERENCES:
patent: 5122425 (1992-06-01), Yoshida et al.
patent: 5217822 (1993-06-01), Yoshida et al.
patent: 0 481 679 (1992-04-01), None
patent: 0 495 583 (1992-07-01), None
patent: 0 594 048 (1994-04-01), None
patent: 4-338180 (1992-11-01), None
patent: 5-151982 (1993-06-01), None
patent: 5-225986 (1993-09-01), None
patent: 6-295730 (1994-10-01), None
patent: 7-211335 (1995-08-01), None
patent: 7-240214 (1995-12-01), None
patent: 8-250138 (1996-09-01), None
patent: 9-274921 (1997-10-01), None
Patent Abstracts of Japan, vol. 013, No. 243 (E-768), Jun. 1989—JP 01 045059 A, Mitsubishi Heavy Industries Ltd., Feb. 17, 1989.

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