ZIF-67制备CoS/CNT复合材料及其储钠性能

Design and Preparation of CoS/CNT Composite via ZIF-67and Research on Sodium Storage Performances

通过溶液自组装-硫化策略制得结构稳定的CoS/CNT复合材料。使用SEM、TEM、BET、XPS和XRD研究了复合材料的形貌结构及元素组成。以不同MWCNT与六水合硝酸钴的质量比的CoS/CNT复合材料作为正极,以钠片为负极,溶有1 M NaPF_(6)的DIGLYME溶剂作为电解液,组装钠离子电池进行测试。结果表明,CoS/CNT复合材料能够减少电池的相反应数目,提高催化转化效率,并显著提高电导率,从而提升其电化学性能,该材料在1 A/g的电流密度下循环100次后,放电比容量保持在486.7 mAh/g。此外,在5 A/g的倍率循环结束后,容量保持率及库伦效率仍接近100%,表现出优异的电化学性能。

The CoS/CNT composites with stable structure were prepared by solution self-assembly-vulcanization strategy.The morphology,structure and elemental composition of the composites were studied by SEM,TEM,BET,XPS and XRD.Using CoS/CNT composites with different mass ratio of MWCNT to cobalt nitrate hexahydrate ascathode,sodium sheet as anode,DIGLYME solvent with 1 M NaPF_(6)as electrolyte,sodium-ion batteries(SIB)were assembled for testing.The results show that the CoS/CNT composite can reduce the number of reaction,improve the catalytic conversion efficiency,and significantly improve the conductivity,thus improving its electrochemical performance.The specific discharge capacity of CoS/CNT composites is maintained at 486.7 mAh/gafter 100 cycles at the current density of 1 A/g.In addition,the capacity retention rate and coulombic efficiency are still close to 100%after ratio cycling at 5 A/g,which shows excellent electrochemical performance.