CoO_(x)/CC复合电极的制备及其电化学性能

Preparation of CoO_(x)/CC composite electrodes and its electrochemical properties

为了改善金属氧化物的导电性和循环性能,采用电化学沉积和热处理方法制备氧化钴/碳布(CoO_(x)/CC)复合电极,通过SEM、XRD和电化学工作站等方法对复合电极的微观形貌组成和电化学性能进行表征和测试.结果表明:①CoO_(x)/CC复合电极表面形成了由大片层构成的棒状晶体,在一定程度上保持了钴基金属有机骨架(Co-MOF)模板原有的结构;②复合电极表面成分为Co、CoO和Co_(3)O_(4)的混相;③作为锂离子电池电极,CoO_(x)/CC复合电极在0.5 mA/cm^(2)的电流密度下,具有较高的面积比容量,为8.5 mAh/cm^(2);④CoO_(x)/CC复合电极循环稳定性良好,面积比容量除首次衰减13%外,基本保持不变.

Toimprove the conductivity and cycling stability of metal oxides,CoO_(x)andcarbonclothcompositeelectrodes(CoO_(x)/CC)were prepared by heat treatment and electrodeposition.The microstructure composition and electrochemical performance of the composite electrode were characterized and tested using SEM,XRD and electrochemical workstation methods.The results showed that:①Rod-shaped crystals assembled by large layers was formed on the surface of the CoO_(x)/CC,which retained the morphology of cobalt based metal organic framework(Co-MOF)template.②The composite electrode surface was a mixture of Co,CoO and Co_(3)O_(4).③As an electrode for lithium-ion batteries,the CoO_(x)/CC composite electrode showed a high area specific capacity of 8.5 mAh/cm^(2) at a current density of 0.5 mA/cm^(2).④The cycle stability of CoO_(x)/CC composite electrode was good,and the area specific capacity remained basically unchanged,except for the first attenuation of 13%.