阳极
锂(药物)
材料科学
接口(物质)
金属锂
金属有机骨架
金属
化学工程
电极
化学
冶金
吸附
复合材料
有机化学
物理化学
内分泌学
毛细管作用
工程类
医学
毛细管数
作者
Yan Wang,Haiyang Wu,Junhao Duan,Lianshan Mou,Shanglong Peng,Juanjuan Huang
标识
DOI:10.1016/j.electacta.2024.144148
摘要
ZnSe has high specific capacities, high electrochemical activity, and various electronic properties, which is considered as promising anode for lithium-ion storage. However, poor electronic conductivity and huge volume expansion during cycling are still the reasons for its limited electrochemical performance. Herein, the composites of ZnSe-CoSe anchored on MXene (ZnSe-CoSe@NC/MX) are synthesized by self-assembly and subsequent selenization. In ZnSe-CoSe@NC/MX composites, the ZnSe-CoSe nanoparticles, obtained by in-situ selenization of metal-organic frameworks (MOFs) at high temperature, are uniformly distributed on MXene sheets, developing robust interface with MXene through chemical bonds, which can enhance structure stability thus suppress the capacity fading during cycling. A heterostructure of CoSe and ZnSe is formed in the ZnSe-CoSe@NC polyhedron, and the generated built-in electric field further increases the ion mobility, raises the equilibrium reaction potential and decreases the activation barrier to trigger redox reactions. Therefore, the as-prepared ZnSe-CoSe@NC/MX exhibites a high capacity of 469.0 mAh g−1 at 0.2 A g−1 after 80 cycles, superior cyclic stability (327.0 mAh g−1 after 600 cycles at 1 A g−1), and excellent rate performance.
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