Analysis of Discharge/Charge Reaction of PbO_2 Thin Film Using Electrochemical QCM Technique

Masami Taguchi; Hiroshi Sugita

首页> 外文期刊>日本金属学会志 >Analysis of Discharge/Charge Reaction of PbO_2 Thin Film Using Electrochemical QCM Technique

【24h】

Analysis of Discharge/Charge Reaction of PbO_2 Thin Film Using Electrochemical QCM Technique

机译：

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

In order to investigate the discharge/charge process of the active materials for the positive electrode in the lead-acid battery, a PhO_2 thin film was deposited on a piezoelectric quartz crystal by reactive sputtering, and then the in Situ observations of the mass change in the PbO_2 electrode were carried out using the electrochemical QCM technique. The PbO_2 thin film produced by sputtering a pure Pb target in an oxygen plasma was identified as a mixture of alpha-PbO_2 and beta-PbO_2. The discharge process by a very low current suggested that the reaction of PbO_2->PbSO_4 proceeded first and then the reactions such as PbO_2->PbO, PbO-> Pb and PbSO_4->Pb occurred one after another. During the potentiostatic discharge/charge process, most of the discharge reaction of PbO_2->PbSO_4 was completed at the beginning of the process, while the charge reaction of PbSO_4->PbO_2 slowly proceeded. The conversion ratio of the PbSO_4 back to the original PbO_2 during charge was estimated to be only 52 percent or so based on the mass change. Right after the start of both the discharge and charge, the mass decreases in sharp intervals as the result of the dissolution-precipitation mechanism were confirmed by the electrochemical QCM technique for the first time. The repetition of the discharge/charge increased the ratio of beta-PbO_2 to alpha-PbO_2 in the charged product. Moreover, there were PbSO_4 crystals of various sizes on the PbO_2 surface after discharge, and the small crystals in the lower part dissolved earlier than the large ones to be trans-formed into the PbO_2 particles of tens of nanometers during the charge. These results suggest that the refinement of the PbSO_4 crystals during discharge is an important factor to improve the charge of the active materials for the positive electrode.

著录项

来源
《日本金属学会志》 |2002年第6期|670-675|共6页
作者
Masami Taguchi; Hiroshi Sugita;
展开▼
作者单位

Department of Materials Science and Engineering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502;

展开▼
收录信息
原文格式 PDF
正文语种日语
中图分类金属学（物理冶金）;冶金工业;
关键词
lead acid battery; electrochemical quartz crystal microbalance technique; discharge/charge; lead dioxide; reactive sputtering; active material for positive electrode;

Analysis of Discharge/Charge Reaction of PbO_2 Thin Film Using Electrochemical QCM Technique

摘要

著录项

相关主题

期刊订阅