鉛蓄電池における負極の異常成長と充放電特性に及ぼすリグニンの影響

抄録

Our study of the influence of different lignins on the anomalous growth of metallic Pb on negative electrodes in lead-acid batteries showed that the cell voltage during charging is increased by adding lignin to the electrolyte, while growth is suppressed The higher the cell voltage, the lower the x-ray intensity ratio of Pb(111)/PbSO₄(211) for the negative electrode This makes the cell voltage during charging a useful criterion of lignin quality for suppressing the anomalous growth of metallic Pb Partially desulfonized lignin (PD-lignin) suppresses growth more effectively than standard lignin The arrangement of functional groups such as carboxyl and alcoholic hydroxide is more important to the effect than molecular weight During charging, lignin obstructs the movement of Pb²⁺ ions to the site where charge-transfer is progressing We deduced from a rotating ring-disk experiment that lignin suppresses the onset of the solid-state reaction in favor of dissolution-precipitation during discharge