Base material for a fuel battery

Details Base material for a fuel battery Base material for a fuel battery

2001-01-11

2002-11-12

Weiner, Laura (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having earth feature

C429S047000

Reexamination Certificate

active

06479183

ABSTRACT:

FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
An example of a conventionally used technique is shown in
FIG. 1. A
base 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: 9-274921 (1997-10-01), None

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