新型炭材料2023，Vol.38Issue(3)：510-521,12.DOI:10.1016/S1872-5805(23)60731-0
三维双金属硫化物Co9S8/MoS2/C异质结用于增强钠离子存储
A bimetallic sulfide Co9S8/MoS2/C heterojunction in a three-dimen-sional carbon structure for increasing sodium ion storage
摘要
Abstract
The synthesis of high-rate and long-life anode materials for sodium ion batteries(SIBs)has attracted much attention.However,the slow kinetics and large increase in volume of the batteries remain major problems.Both metal-organic frameworks and MoS2 have shown properties suitable for SIBs,making research on their composite systems an attractive area of research.We report the formation of flower-like Co9S8/MoS2/C composites by a simultaneous vulcanization-carbonization process using MoCl5 as the Mo source and a 2-methylimidazole cobalt salt as the Co and C precursor at different temperatures(600,700 and 800 ℃)in sub-limed sulfur.The effect of the heterojunction on the diffusion kinetics was analyzed using density functional theory.The results in-dicate that the electronic structure is different at the interface in the heterogeneous structure,exhibiting typical metallic properties and better electronic conductivity.In addition,the anode material Co9S8/MoS2/C synthesized at 700 ℃ had the most stable structure and best electrochemical performance of the three samples.Notably,the discharge capacity of Co9S8/MoS2/C-700 fully recovered from 368 to 571 mAh g-1 and then stabilized at 543 mAh g-1 when the current density was restored from 4 000 to 40 mA g-1.This work demonstrates the preparation of heterojunction materials for composite anode materials as a step to producing high-performance met-al SIBs.关键词
钠离子电池/负极/金属有机框架/MoS2/Co9S8Key words
Sodium ion batteries/Anode/Metal-organic frame/MoS2/Co9S8分类
通用工业技术引用本文复制引用
陈红,穆建佳,边煜华,高宣雯,王达,刘朝孟,骆文彬..三维双金属硫化物Co9S8/MoS2/C异质结用于增强钠离子存储[J].新型炭材料,2023,38(3):510-521,12.基金项目
This work was supported by the National Natur-al Science Foundation of China(52272194,52204308),Liaoning Revitalization Talents Program(XLYC2007155)and the Fundamental Research Funds for the Central Universities(N2025018,N2025009)and China Postdoctoral Science Founda-tion(2022M710639).国家自然科学基金(No.52272194,52204308) （52272194,52204308）
辽宁省"兴辽英才"青年拔尖人才项目(No.XLYC2007155) （No.XLYC2007155）
中央高校基本科研业务费(N2025018,N2025009) （N2025018,N2025009）
中国博士后基金(2022M710639). （2022M710639）
