脉冲激光沉积GeO_2薄膜的电化学性能  

Electrochemical Properties of GeO_2 Films Fabricated by Plused Laser Deposition

作　　者：周永宁[1] 张华[1] 吴长亮[1] 吴晓京[1] 傅正文[1] 

机构地区：[1]复旦大学化学系激光化学研究所,材料科学系,上海市分子催化和功能材料重点实验室,上海200433

出　　处：《无机化学学报》2007年第8期1353-1357,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20203006)。

摘　　要：采用脉冲激光沉积法在不锈钢基片上制备了GeO2薄膜。充放电性能显示其具有高达1336mAh·g-1可逆容量,这相当于每个GeO2可与5.1个Li发生反应。其循环伏安特性显示在1.2V和0.4V处出现一对新的氧化还原峰。充放电后薄膜的组成与结构通过非原位高分辨电子显微和选区电子衍射来表征。结果显示在外电场作用下,Ge能够可逆地驱动Li2O分解和形成。这是金属氧化物的一种新的电化学反应机理。GeO2 thin films have been prepared by pulsed laser deposition on stainless steels. The charge and discharge performance results indicate a high reversible capacity of 1 336 mAh·g^-1,corresponding to 5.1 Li per GeO2 with good cycling performance. The cyclic voltammograms show that a new couple of reduction and oxidation peaks at 0.4 and 1.2 V appear for the first time. The components and structures of the films after charging and discharging were characterized by ex situ high resolution transmission electron microscopy and selected area electron diffraction measurements. The results indicate that Li2O can be driven to decompose or form reversibly by metal Ge.

关 键 词：GeO2 薄膜 脉冲激光沉积 锂离子电池 

分 类 号：O646.2[理学—物理化学]