论文部分内容阅读
Recently, metal oxides as high capacity anode materials had been investigated for lithium ion batteries.However, the fast capacity fading upon cycling leaded poor durability, which hindered their application as higher energy density of lithium ion battery. In this paper, a nanostructured nanocomposite with graphene supported CoFe_2O_4 nanoparticles(NPs) was prepared via simple hydrothermal reaction. The uniform CoFe_2O_4 NPs were anchored on graphene sheets, which brought a good performance on cyclability. Combined with the optimization of graphene content, the anode delivered a better capacity retention of 944 m A h g~(-1)over 50 cycles at current density of 100 m A g~(-1)and the good reversible capacity as 990 m A h g~(-1)when the rate returned from 5 A g~(-1)to 0.1 A g~(-1)after 60 cycles. The present work provided a desired structure for conversion anode materials or other electrode materials of large volume change.
Recently, metal oxides as high capacity anode materials had been investigated for lithium ion batteries. When the fast capacity fading upon cycling leaded poor durability, which hindered their application as higher energy density of lithium ion battery. In this paper, a nanostructured nanocomposite with The uniform CoFe 2 O 4 NPs were anchored on graphene sheets, which provided a good performance on cyclability. Combined with the optimization of graphene content, the anode delivered a better capacity retention of 944 m A hg ~ (-1) over 50 cycles at current density of 100 m A g ~ (-1) and the good reversible capacity as 990 m A hg ~ (-1) when the rate returned from 5 A g ~ (-1) ) to 0.1 A g ~ (-1) after 60 cycles. The present work provided a desired structure for conversion anode materials or other electrode materials of large volume change.