锂-氧化铜电池反应机理——Ⅱ.交流阻抗法研究阴极过程

锂-氧化铜电池反应机理——Ⅱ.交流阻抗法研究阴极过程 THE REACTION MECHANISM OF Li-CuO CELL Ⅱ.Investigation of the cathode process by a.c.impedance method 祖延兵 Zu Yanbing Dong Qinghua Cai Naicai 1 first-author 董庆华 1 蔡乃才 1 武汉大学化学系 武汉大学化学系 Department of Chemistry, Wuhan University Department of Chemistry, Wuhan University 本文测量了锂一氧化铜电池和锂一氧化亚铜电池阴极阻抗随电位的变化,与前文[6]中报遭的阴极光电流变化作了比较,根据能带理论解释了实验现象.结果表明,锂.氧化铜电池阴极过程中。阴极电位为2.5 V（vs.Li/Li + ）时,电解液中锂离子开始嵌入氧化铜晶格;当阴极电位降到2.3 V以下时,有后续反应发生,生成氧化亚铜等新相;氧化亚铜的还原开始于1.9 V左右.还确定了锂电池体系中,氧化亚铜和氧化铜电极的平带电位分别为2.65 V和3.72 V. The changes of cathode impedances of Li-CuO cell and Li-Cu 2 O cell with potential scan were measured,and compared with the changes of the photocurrents of the cathodes reported in the pre- vious article of this series. The results,interpreted on the basis of energy band theory,show that :when Li-CuO cell discharges, Li + ions start inserting into CuO lattice at 2.5 V, the succeeding reaction oc- curs below 2.3 V producing Cu 2 O,and the reduction of Cu 2 O to Cu at 1.9 V. The flatband potentials of Cu 2 O and CuO electrodes in 1. 0 mol· L -1 LiCIO 4 propylene carbonate solution were also deter- mined. 锂-氧化铜电池 交流阻抗法 嵌入反应 Li-CuO cell a.c.impedance method intercalation reaction O646.21 国家自然科学基金资助的课题 1993-05-01 2021-04-01 5