α-MoO_3纳米带的制备及电化学性能  

Synthesis and electrochemical performance of α-MoO_3 nanobelts

作　　者：赵张媛 杨元圣 张文翠[1] 崔永莉[1] 

机构地区：[1]中国矿业大学材料科学与工程学院,江苏徐州221116

出　　处：《电池》2015年第5期269-272,共4页Battery Bimonthly

基　　金：中国矿业大学实验室开放基金(2014203)

摘　　要：采用双氧水氧化辅以水热法制备α-Mo O3纳米带正极材料,用XRD和SEM对结构和表面形貌进行分析,用循环伏安法和恒流充放电研究电化学性能。在200℃水热条件下制备的α-Mo O3纳米带呈板条状;在180℃下制备的呈细条带状。α-Mo O3首次循环伏安曲线上出现的两对还原氧化峰（2.73 V、3.06 V）和（2.24 V、2.74 V）,分别对应于Li＋在α-Mo O3八面体层内的不可逆嵌脱和层间的可逆嵌脱。以0.2 C在1.5-3.5 V充放电,板条状和长条状α-Mo O3纳米带的首次放电比容量分别为294.7 m Ah/g和300.0 m Ah/g,50次循环的容量保持率分别为49.9%和63.4%。给出了α-Mo O3的充放电机理,发现容量衰减主要是Li＋在α-Mo O3八面体层内的不可逆脱嵌引起的。α-MoO3 nanobelts were synthesized by hydrogen peroxide oxidation and hydrothermal method. The structure and morphology were analysized by XRD and SEM, electrochemical performance was studied by cyclic voltammetry and galvanostatic charge-discharge. The orthorhombic α-MoO3 nanobelts synthesized by hydrothermal method at 200℃ showed strip form, the ones prepared at 180℃ showed fine ribbon form. Two pairs of redox peaks at 2. 73 V,3.06 V and 2. 24 V,2. 74 V which were appeared on the initial cyclic voltammetry curve of or-MoO3, were attributed to the irreversible Li^＋ intercalation/de-intercalation in octahedron intralayers of or-MoO3 and the reversible insertion/extraction in interlayers, respectively. When charged-discharged in 1.5 - 3.5 V at 0. 2 C,the initial specific discharge capacity of strip form and fine ribbon form α-MoO3 at 0. 2 C was 294. 7 mAh/g and 300. 0 mAh/g, respectively, the capacity retention after 50 cycles was 49. 9% and 63.4%, respectively. The charge-discharge mechanism of α-MoO3 was given,it was found that the capacity fading was mainly attributed to the irreversible Li^＋ intercalation/de-intercalation in α-MoO3 octahedron intralayers.

关 键 词：α-MoO3纳米带 水热法 电化学性能 充放电机理 

分 类 号：TQ136.12[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]