Co_(3)O_(4)纳米空心球电极的制备及其储锂性能

Preparation and lithium storage performance of Co_(3)O_(4) nanometer hollow sphere electrode

采用六水硝酸钴和顺丁烯二酸为原料,以水热法合成前体材料,在空气氛围下进行高温(600℃和700℃)煅烧,得到Co-Ma-600和Co-Ma-700衍生材料。采用SEM和TEM考察衍生材料的形貌和尺寸,通过XRD研究其结构。将衍生材料Co-Ma-600和Co-Ma-700作为锂离子电池负极材料,并将其组装成原电池。电化学测试结果表明:钴基金属有机骨架衍生材料Co-Ma-600和Co-Ma-700均为Co_(3)O_(4),Co-Ma-600形成了较为稳定的空心纳米球结构。在0.1 A·g^(-1)的电流密度下,Co-Ma-600作为锂离子电池负极材料表现出良好的电化学性能,第一次循环可逆比容量达到808.7 m Ah·g^(-1),经过100次循环后可逆比容量达863.2 m Ah·g^(-1),与初始比容量相比略有升高。

The precursor materials were synthesized from cobalt nitrate hexahydrate and maleic acid via the hydrothermal method and calcined at high temperatures(600℃ and 700℃)in an air atmosphere to obtain Co-Ma-600 and Co-Ma-700 derivative materials.XRD and SEM/TEM were used to investigate the structure and morphology of the derived materials.Co-Ma-600 and Co-Ma-700 were used as anode materials for lithium-ion batteries and assembled into primary batteries.The results showed that the cobalt-based metal-organic frameworks of Co-Ma-600 and Co-Ma-700 were both Co_(3)O_(4),and Co-Ma-600 formed a relatively stable hollow nanosphere.At a current density of 0.1 A·g^(-1),Co-Ma-600 exhibited good electrochemical performance as a lithium-ion battery anode material,with a reversible specific capacity of 808.7 mAh·g^(-1) in the first cycle.After 100 cycles,the reversible specific capacity of Co-Ma-600 reached 863.2 mAh·g^(-1),slightly higher than the initial specific capacity.