摘要
为了改善Fe_(3)O_(4)作为锂离子电池负极材料时循环稳定性差的问题,以铁基沸石咪唑酯框架结构材料(Fe-ZIF)为前驱体,使用多巴胺通过聚合反应与其复合,再与石墨烯通过静电吸附作用组装,经过煅烧碳化,制备了Fe_(3)O_(4)@NC/G复合材料。研究结果表明,多巴胺与石墨烯的引入有效提高了Fe_(3)O_(4)在充放电过程中的电化学稳定性。在0.1 A·g^(-1)电流密度下,充放电循环30圈,Fe_(3)O_(4)@NC/G的放电比容量为1005.6 mAh·g^(-1)。当电流密度为2 A·g^(-1)时,经过300圈循环,其放电比容量仍有838.3 mAh·g^(-1)。Fe_(3)O_(4)@NC/G复合材料优异的电化学性能归因于独特的结构设计,这对其他负极材料的构筑提供了一定的参考价值。
To improve the cycling stability of Fe_(3)O_(4)as a lithium-ion battery anode material,Fe-Zeolitic imidazolate frameworks(Fe-ZIF)was used as a precursor,and dopamine was coupled to it through a polymerization reaction.The resulting material was then assembled with graphene through electrostatic adsorption,followed by calcination and carbonization to prepare Fe_(3)O_(4)@NC/G composite materials.Research results show that the introduction of dopamine and graphene effectively improves the electrochemical stability of Fe_(3)O_(4)during charge and discharge processes.At current density of 0.1 A·g^(-1),after 30 cycles of charge and discharge,the discharge specific capacity of Fe_(3)O_(4)@NC/G is 1005.6 mAh·g^(-1).When the current density is 2 A·g^(-1),after 300 cycles,the discharge specific capacity remains 838.3 mAh·g^(-1).The excellent electrochemical properties of Fe_(3)O_(4)@NC/G composites are attributed to their unique structural design,which provides some reference value for the construction of other anode electrode materials.
作者
张亚婷
索轲
刘国阳
朱由余
张娜娜
ZHANG Yating;SUO Ke;LIU Guoyang;ZHU Youyu;ZHANG Nana(School of Chemistry and Chemical Engineering,Xian University of Science and Technology,Xian 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xian 710021,China)
出处
《电子元件与材料》
CAS
北大核心
2023年第9期1033-1039,共7页
Electronic Components And Materials
基金
国家自然科学基金(U1810113,U1203292)。
