二硫化钴@二硫化钴/硫化锌/聚多巴胺蛋黄多层异质壳微球的制备及储锂性能
Preparation and lithium storage properties of CoS2@CoS2/ZnS/PDA microspheres with yolk multilayered heterogeneous shell structure
吴帆 1袁永锋1
作者信息
- 1. 浙江理工大学机械自动控制学院,杭州 310018
- 折叠
摘要
为解决二硫化钴作为锂离子电池负极材料倍率性能差、循环寿命短的问题,以钴甘油酸酯球为模板,通过刻蚀络合反应、硫化反应和聚合反应制备了具有蛋黄多层异质壳结构的二硫化钴@二硫化钴/硫化锌/聚多巴胺微球.采用扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱仪、拉曼光谱仪、电池性能测试仪和电化学工作站对微球的形貌、结构和储锂性能进行测试与表征.结果表明:以二硫化钴@二硫化钴/硫化锌/聚多巴胺微球用作锂离子电池负极材料,在电流密度为1.0 A/g的条件下循环600次后,放电容量保持在921 mAh/g,在10.0 A/g的高倍率下放电容量为184 mAh/g,这证明微球具有稳定的循环性能和优异的倍率能力.研究表明,蛋黄多层异质壳结构为二硫化钴在锂离子电池负极材料的应用提供了新的复合设计思路.
Abstract
To solve the problems of poor rate performance and short cycle life of cobalt disulfide(CoS2)as a negative electrode material of lithium ion batteries,CoS2@CoS2/ZnS/PDA microspheres with yolk multilayered heterogeneous shell structure were prepared by etching complexation reaction,sulfuration reaction and polymerization reaction with cobalt glycerol ester spheres as a template.Scanning electron microscope,transmission electron microscope,X-ray diffractometer,X-ray photoelectron spectrometer,Raman spectrometer,battery performance tester and electrochemical workstation were used to test and characterize the morphology,structure and lithium storage performance of the microspheres.The results showed that when CoS2@CoS2/ZnS/PDA microspheres were used as negative electrode materials for lithium ion batteries,after 600 cycles at a current density of 1.0 A/g,the discharge capacity was maintained at 921 mAh/g,and the discharge capacity was 184 mAh/g at a high rate of 10.0 A/g.This proved that the microspheres had stable cycling performance and excellent magnification ability.The results show that the yolk multilayered heterogeneous shell structure provides a new composite design idea for the application of CoS2 in the negative electrode material of lithium ion batteries.
关键词
锂离子电池/蛋黄壳结构/金属硫化物/聚多巴胺/异质结构Key words
lithium-ion batteries/yolk-shell structure/metal sulfide/polydopamine/heterostructure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据