脉冲激光沉积法制备氧化铋薄膜及其电化学性质研究  

Electrochemical Properties of Bismuth Oxide Thin Films Prepared by Pulsed Laser Deposition

作　　者：储艳秋[1] 付正文[1] 应丽[1] 郑企克[1] 秦启宗[1] 

机构地区：[1]复旦大学化学系激光化学研究所,上海200433

出　　处：《复旦学报（自然科学版）》2003年第6期956-960,共5页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金资助项目(200083001;20203006)

摘　　要：首次采用355nm脉冲激光沉积在不锈钢基片上制备了氧化铋薄膜.X 射线衍射(XRD)测试表明在基片温度为300℃,沉积时间为0.5h制备得到的Bi2O3薄膜具有四方结构,SEM和Raman光谱测定对该Bi2O3薄膜的表面形貌和锂化前后的结构进行了表征,结果表明薄膜由小于100nm针状晶粒组成,锂化后的产物可能是LixBi2O3.此外,由电位阶跃法测定了上述Bi2O3薄膜电极的锂离子扩散系数.电化学测定表明,上述Bi2O3薄膜具有充放电循环性能.在电压范围为0.70～3.5V,该氧化铋薄膜在充放电速率为2C时的比容量大约为100mAh/g,并且保持经100次以上充放电循环而没有明显的衰减.Bismuth oxide thin films have been successfully fabricated on the stainless steel substrates by using pulsed laser deposition method for the first time. The tetragonal Bi_(2)O_(3) thin films with good electrochemical properties were fabricated at 300 ℃ of the substrate temperature in 30 Pa oxygen ambient. Between 0.70 and 3.5 V,the Bi_(2)O_(3) thin films delivered a reversible capacity of 100 mAh/g at 2 C rate and exhibited a good cycling reversibility with no obvious fading up to 100 cycles. The structure and compositions of Bi_(2)O_(3) films were characterized by X-ray diffraction,scanning electron microscopy and Raman spectrometry. The diffusion coefficient determined by potential step method for the extraction of lithium ions is found to be 5.8×10^(-14) cm^(2)·s^(-1).

关 键 词：脉冲激光沉积 氧化铋 阴极薄膜 电化学性质 锂离子电池 制备 

分 类 号：TN304.055[电子电信—物理电子学] O614.532[理学—无机化学]