尖晶石型LiMn_2O_4薄膜电极的制备及电化学性质研究──电化学石英晶体微天平(EQCM)技术研究

Preparation and Performance of Spinel LiMn 2O 4 Thin Films An EQCM Technique Study

石英晶体微天平（ＱＣＭ）作为纳克级的质量传感器，可通过测定石英晶体振动频率的变化来测定石英晶体表面微小的质量变化．近年来，电化学石英晶体微天平（ＥＱＣＭ）技术已广泛应用于电化学研究领域［１］．在锂嵌入型电极充放电过程中，锂离子在嵌基材料中嵌入脱出会引...

The intercalation process of Li + in spinel LiMn 2O 4 thin films in 1 mol/L LiClO 4+PC solution has been investigated using EQCM method. The results indicate that a passive solvent film is formed on the lithium manganese oxides electrode surface in PC solvent. The Li + intercalation is a main process in the potential range between 2 5￣3 25 V. However, the decomposition of the solvent film and de intercalation of Li + occur simultaneously when the electrode potentials are controlled between 3 7￣4 1 V.