锂-氧化铜电池反应机理(Ⅰ)——光电化学方法研究阴极嵌入反应

Reaction Mechanism of Li-CuO Cell ( Ⅰ ) ——Investigation of the Cathode Intercalation Reaction by Photoelectrochemical Method

采用光电化学方法现场研究了锂-氧化铜电池的嵌入反应,氧化铜电极光电流的变化直观地反映了该电化学嵌入过程.发现锂离子嵌入氧化铜电极的反应始于2.5V(vs.Li/Li^+),锂以施主杂质状态存在于氧化铜晶格中,改变了阴极的半导体性质.在较低电位下,可能有产生氧化亚铜的后续反应.

The cathode intercalation reaction of Li-CuO cell was studied in-situ by photoelec-trochemical method. The changes of photocurrent of CuO electrode reflected the intercalation process directly. It is found that Li+ ions start inserting into CuO lattice at 2. 5 V(vs. Li/Li+) and act as the donor impurities, changing the semiconductor property of the cathode. Some succeeding reactions may take place at lower potential, leading to the formation of Cu2O.