光电化学方法研究嵌入反应

自从七十年代Steele和Armand等提出用嵌入材料作为电池的活性物质以来,新型的高能锂电池有了很大的发展.这类电池反应的特点是伴随电子转移的同时还有锂离子进入阴极主体晶格中,故称为嵌入反应.然而,从研究嵌入反应的方法来看,除了电位扫描等经典的电化学技术以外,用的是X射线衍射、X射线光电子能谱等非现场的表面测试技术,分析放电后阴极中有锂存在,证明这类反应机理是锂离子的嵌入反应.迄今为止,尚未见到在放电过程中现场检测锂离子嵌入的方法的报导.鉴于嵌入反应电池的阴极材料大多数是金

PHOTOELECTROCHEMICAL STUDIES OF INTERCALATION REACTION

The electrochemical intercalation reaction of lithium cell was investigated by photoelectrochemical technique. The experimental results show that the lithium ions inserting into the orystal lattice of the cathode, act as a donor impurities and changethe semiconductor properties of the cathode matrix. From the change of photovoltageof the cathode during the discharging process of the lithium cell, the intercalationprocess of lithium ions could be studied in-situ.