核壳纳米球钴基金属有机聚合物的制备及其储锂性能

Core-Shell Nanosphere Cobalt-Based Metal-Organic Polymer:Preparation and Lithium Storage Performance

以偏苯三甲酸和六水合硝酸钴为原料,通过水热法合成了2种反应时间不同的钴基金属有机聚合物(Co‑MOP)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和N_(2)吸附-脱附对Co‑MOP材料进行了结构和形貌表征。将2种Co‑MOP材料用作锂离子电池负极材料,并进行了电化学性能测试。结果表明,Co‑MOP‑12(水热反应12 h)展示出了优异的电化学性能,在100 mA·g^(-1)的电流密度下,Co‑MOP‑12电极的首圈可逆比容量达到979 mAh·g^(-1),循环100圈后比容量高达1345 mAh·g^(-1)。

Using trimellitic acid and cobalt nitrate hexahydrate as raw materials,two cobalt-based metal-organic polymers(Co-MOP)with different reaction times were synthesized by the hydrothermal method.The structure and morphology of Co-MOP were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),and N_(2) adsorption-desorption test.Two cobalt-based metal-organic polymer materials were used as anode materials for lithium-ion batteries,and the electrochemical performance tests were carried out.The results showed that Co-MOP-12(hydrothermal reaction for 12 h)exhibited excellent electrochemical performance.Thefirst-cyclereversiblespecificcapacitytheofCo-MOP-12 electrodereached 979 mAh·g^(-1) atacurrent density of 100 mA·g^(-1).The specific capacity was as high as 1345 mAh·g^(-1) after 100 cycles.