To solve the problems of high-volume expansion stress and poor conductivity in the application of bismuth sulfide anode materials for sodium ion batteries,Bi/ZIF-8 MOF materials were used as precursors to prepare Bi2S3/SnS@PDA composite through carbonization,tin ion adsorption,vulcanization,and PDA coating processes.The morphology and structure of the sample were characterized by SEM,XRD,and XPS.The electrochemical performance of the sample was tested using a battery charge discharge tester and an electrochemical workstation.The influence of element ratio of Bi/Sn on the electrochemical performance of the material was explored.The results indicate that the obtained sample has the best sodium storage performance when the Bi/Sn ratio is 1:1.After 100 cycles at 0.2 A/g,the specific capacity of the sample reaches 862.3 mAh/g.After 500 cycles at 1 A/g,its specific capacity can still maintain 723.9 mAh/g.The excellent electrochemical performance of the sample is attributed to its optimized chemical composition and reasonable structural design.This study provides a new strategy for the design of high-performance anode materials,and the resulting BiSn Bimetallic sulfide composite has potential application prospects in the field of sodium storage.
关键词
钠离子电池/负极/金属有机框架/硫化铋/硫化锡
Key words
sodium ion battery/anode/metal-organic framework/bismuth sulphide/tin sulphide
万方数据