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A tertiary battery (TB) can be charged by heating or cooling via the difference in the electrochemical Seebeck coefficient α between the cathode and anode. Here, we investigated the battery resistance R and its effect on the performance of a laminate film-type Na 1.48 Co[Fe(CN) 6 ] 0.87 (Co-PBA)/Na 1.76 Ni[Fe(CN) 6 ] 0.94 (Ni-PBA) TB. We found that the charge-transfer resistance R ct and diffusion resistance R dif are the dominant components of R , while the solution resistance R s has a minor role. Regardless of the solute type, R varied inversely proportional to the Na + concentration M . In a high- R TB, the thermal voltage V TB and discharge capacity Q TB per unit weight of the total active material are significantly suppressed, which is quantitatively explained in terms of the voltage drop ( IR , where I is current) during the discharge process.
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Furuuchi et al. (2024) studied this question.
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