中空CoMn_2O_4/NC复合物的合成及其电化学性能研究

Synthesis and Electrochemical Properties of Hollow CoMn_2O_4/NC Composites

以碳球为模板,通过简单的水热-煅烧法合成中空球状CoMn_2O_4,再与2-甲基咪唑水热合成CoMn_2O_4/ZIF-67,经氮气气氛煅烧得CoMn_2O_4/NC复合物。通过SEM、XRD、BET测试对样品的形貌和结晶结构进行表征,采用CHI660E电化学工作站对样品进行电化学性能评估。结果表明,制备得到的中空CoMn_2O_4/NC复合物用于锂离子电池阳极材料,具有理想的可逆容量,良好的循环性能和倍率性能,循环过程中其库伦效率保持在99%。

The hollow spherical CoMn2O4 was synthesized by a simple hydrothermal-calcination method using a carbon sphere as a template, and then CoMn2O4/ZIF-67 was hydrothermally synthesized with dimethylimidazole, and calcined in a nitrogen atmosphere to obtain CoMn2O4/NC composite material. The morphology and crystal structure of the samples were characterized by SEM, XRD and BET tests. The electrochemical performance of the samples was evaluated using CHI660E electrochemical workstation. The results showed that the prepared hollow CoMn2O4/NC composites used in anode materials of lithium ion batteries showed good reversible capacity, good cycle performance and rate performance. The coulomb efficiency was maintained at 99% during the whole cycle.