Target in FY 1999

Overall resistance

0.5 to 1.0 %/1000hrs = 4.0 to 8.0mV/1000hrs

0.25 %/1000hrs = 2 mV/1000hrs

Reaction resistance in anode and cathode (,Ra+Rc)

0.29 to 0.5 %/1000hrs

0.12 %/1000hrs

Electronic resistance (Re)

0.06 to 0.2 %/1000hrs

0.08 %/I000hrs

Ion conductive resistance (/?•)

0.15 to 0.3 %/1000hrs

0.05 %/1000hrs

5. Estimation of Cell Endurance

Lifetime around 40,000 hrs is, indeed, long time to demonstrate. In order to prospect for newly developed stacks with better performance in shorter investigating period, Central Research Institute of Electric Power Industry (CRIEPI) has just now started to induce equations for estimation of individual decay rates such as reaction resistance in anode and cathode (R^ RJ, electronic resistance (Rr) and ion conductive resistance (/?,) as well as short-circuit time (rjt.) as follows;

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