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Preliminary pore volume distribution measurements were made on selected material samples. These measurements, shown in Figure 35-5, indicate an average pore diameter of 29 microns for untreated PG-60. Data supplied by the manufacturer of 19C also are presented in Figure 35-5, and show an almost identical average pore diameter. In addition, both sets of data indicate a similar spread in pore volume distribution. In both cases the bulk of the pores are between 20 and 40 microns. However, the major difference in the voltaic performance between the two graphites is thought to be related to the difference in the specific porosity of each. The manufacturer reports the porosity of 19C as being 0.30cc/g, while measurements on PG-60 subcontracted to an outside testing laboratory (Micromeritics Instrument Corporation, 5680 Goshen Springs Rd., Norcross, Georgia 30071) show a porosity of 0.4 - 0.5cc/g. This difference is reflected in the differing mass densities of each graphite; 1.05 for PG-60 vs. 1.35 for 19C. These properties appear to mani fest themselves as a decreased voltage on discharge at high current density, while having essentially no effect on charge. Although this property appears to be a disadvantage, its increased density may be capable of extending the electrochemical lifetime of the chlorine electrode or offering certain other benefits. PORE DIAMETER (jum) for 130° contact angle Plot of pore size and volume distribution measurements Figure 35-5. made on selected porous graphite samples. 35-7 o u m 30 100% O mz -i o ■n 13 0 30 m m D 30 m > H m 30 —i 1 >z z o o > —J om o >s m H m 30PDF Image | Development of the Zinc-Chlorine Battery for Utility
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