焙烧时间对Li1.2V3O8电极材料的结构、颗粒分布和电化学性能的影响  

Influence of Calcination Time on the Structure,Particles Distribution and Electrochemical Performances of Li_(1.2)V_3O_8 Cathode Material

作　　者：曹晓雨[1] 谢玲玲[1] 詹晖[2] 周运鸿[2] 

机构地区：[1]河南工业大学化学化工学院,郑州450001 [2]武汉大学化学与分子科学学院,武汉430072

出　　处：《河南师范大学学报（自然科学版）》2008年第5期79-82,共4页Journal of Henan Normal University(Natural Science Edition)

基　　金：国家级重大973“致密能源”基础研究项目

摘　　要：以V2O5水凝胶和LiOH.H2O为原料,采用溶胶-凝胶法制备了Li1.2V3O8前驱体,控制在300℃下焙烧不同时间成功地获得了锂二次电池正极材料Li1.2V3O8.利用XRD(粉末X-射线衍射)、SEM(扫描电子显微镜)和LPSA(激光粒度分析)对产物进行了物理表征;采用恒流充放电技术评价了其电化学性能.结果表明,与其它焙烧时间的样品相比,焙烧10 h的样品具有较弱的(100)衍射峰强度、较大的d100层间距、较小的颗粒尺寸和较窄的粒度分布区间,其最高放电容量为320 mAh.g-1,并表现出了良好的循环性能.The precursors Li1.2V3O8 are synthesized by the sol-gel reaction of V2O3 hydrogel and LiOH · H2O. Li1.2V3O8 powders as cathode materials for lithium secondary batteries are successfully obtained by calcining the precursors at 300 ℃ for different times. The thus-obtained samples are physically-characterized by means of XRD （powder X-ray diffraction）, SEM （scanning electron microscope） and LPSA （laser particles size analysis）, and the electrochemical performances of the samples are assessed by the galvanostatic discharge-charge technique. The results indicate that the sample made at 300 ℃ for 10 h displays lower intensity of diffraction peak （100）, larger interlayer spacing of d100, smaller particles size and narrower particles distribution range compared to the samples obtained at 300 ℃ for other calcination times. The sample synthesized at 300 ℃ for 10 h has a maximum discharge capacity of 320 mAh · g^-1 and exhibits a good cyclability.

关 键 词：焙烧时间 晶体结构 颗粒分布 Li1.2V3O8 正极材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]