Polarization Study of Acid Stratification in a Vented Lead-acid Battery

Abstract

To well understand the mechanism of acid stratification in vented lead-acid batteries, the distributions of sulfuric acid in the vertical direction were measured by a refractive index meter. Also, the measurement of the electrochemical potential distributions in the vertical direction was tried using four dynamic hydrogen electrodes (DHEs). The acid stratification and its relaxation were confirmed by the measurement of sulfuric acid distributions during the charge/discharge and the rest state. There was a difference of four times in the time constant of the acid stratification relaxation between the upper part (top) and the lower part (bottom). This suggests that the acid diffusion is not a dominant reaction of the acid stratification relaxation. The local charge and discharge simultaneously must be occurred on the positive and negative electrode individually due to the electrochemical potential difference. In other words, the electrochemical potential difference probably is the dominant driving force of the acid stratification relaxation. The electrochemical potential distributions in the vertical direction were actually measured using the four DHEs.

Polarization Study and AC-Impedance Measurement in the Horizontal Plane of a Lithium-ion Battery Using Eight Reference Electrodes

“…，固体高分子形 燃料電池(燃料欠乏と空気欠乏) 19 ，電気二重層キャパシ タ(端部異常腐食) 20,21 ，リチウムイオンキャパシタ(Li ドープ) 22 ，バッテリ複合型キャパシタ(電流分担) 23 ，鉛 蓄電池(成層化現象) 24 などの電気化学デバイスのセル面 内の電位挙動を解析し報告している． 861-871 (2016) Positive-side) と正極に対峙しない負極張り出し辺 (Jutting Negative-side) を設けたセル，Type B ( Fig. 1(B Electrochemistry, 84(11), 861-871 (2016) Fig.…”