中文摘要：

采用脉冲激光溅射的方法成功制备了掺杂二氧化硅的钴酸锂薄膜电极。结合SEM，XRD，HRTEM，SAED，EDX，充放电，以及循环伏安等手段对其形貌，结构与电化学性能进行了研究。结果表明．掺杂了二氧化硅的钴酸锂电极薄膜在电化学反应的过程中具有结构刚性，放电平台稳定，极化较小等优点，因此可能成为一种优良的二次锂离子正极材料。

英文摘要：

Nano-SiO2 modified lithium cobalt oxide thin film has been successfully synthesized by pulsed laser ablation of a mixture of SiO2, cobalt acetate and lithium carbonate. EDX revealed that the SiO2 content of the film is about 10wt%. By employing charge/discharge and cyclic vohammetry （CV） measurements, the electrochemical properties of as-deposited film with lithium has been investigated. Our results demonstrated that the addition of SiO2 into LiCoO2 should play an important role in the reversibility of the crystalline structure and morphological changes by using ex situ HRTEM, SAED and SEM. The nano-SiO2 modified lithium cobalt oxide film could be a promising candidate of cathode material for lithium ion battery due to its good reversibility.