Rg. 5 Shorting current by NiO cathode dissolution

Figure 5 shows history of calculated shorting current density. Short current density began to increase at 1400 h and then gradually increased with operation time. This result agrees-with the measured voltage history in Fig. 4. The shorting current would be caused by NiO cathode dissolution. The measured shorting time shows a good agreement with the time calculated by empirical equation (1). Ni contents of Li/K cells at 1400 h calculated by data of single cells are enough to occur the shorting(6). However, Ni contents of Li/Na cells are lower than of Li/K cells since NiO solubility of Li/Na is lower than of Li/K.

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