In order to improve the reversible specific capacity and the cycling stability of LiNi0.5Co0.2 Mn0.3O2(NCM523),it is dually modified through coated with polyacene(PAS)and co-doped with potassium and chloride.The structure,morphology,and electrochemical properties of NCM523,which are coated with different amounts of PAS and doped with potassium and chloride,are studied by means of XRD,SEM,TEM,and the constant current charge-discharge test.The results show that the NCM523 sample co-doped with 1 mol％K and Cl and coated with 2 wt.％PAS demonstrates the initial discharge capacity of 209.5 mAh·g-1 at 0.1 C.After both have experienced for 100 cycles of charge-discharge at 1C,the discharge capacity retention rate of the dually modified sample is 19％higher than that of the unmodified NCM523.The specific discharge capacity of the dually modified NCM523 sample is 158.1 mAh·g-1 under the 5 C ratio,which is 13％higher than that of the unmodified NCM523.
NETL
NSTL
万方数据
