一维氮掺杂碳包覆Fe_(3)O_(4)和Fe_(7)S_(8)纳米棒复合材料的制备及其储锂、储钠性能研究  

Preparation of one-dimensional N-doped carbon coated Fe_(3)O_(4)and Fe_(7)S_(8)nanorods composite materials and study on the lithium/sodium storage performances

作　　者：梁正 吴家豪 王畅 尚振领 王逸飞 刘严 姜付义[1] 周艳丽 LIANG Zheng;WU Jiahao;WANG Chang;SHANG Zhenling;WANG Yifei;LIU Yan;JIANG Fuyi;ZHOU Yanli(School of Environment and Material Engineering,Yantai University,Yantai 264005,Shandong,China)

机构地区：[1]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《化学研究》2022年第1期62-71,共10页Chemical Research

基　　金：国家自然科学基金面上项目(52072328);山东省大学生创新创业训练项目。

摘　　要：以水热法制备的羟基氧化铁纳米棒作为反应原料,首先采用室温聚合法,在其表面包覆一层均匀的聚多巴胺,获得聚多巴胺包覆的羟基氧化铁,然后通过后续热处理,获得氮掺杂碳包覆的Fe_(3)O_(4)和Fe_(7)S_(8)复合材料(Fe_(3)O_(4)@NC和Fe_(7)S_(8)@NC)。采用XRD、拉曼光谱仪、XPS、SEM以及TEM等技术对上述两种复合材料的结构和形貌进行表征。将上述制备的两种复合材料分别作为负极材料,组装纽扣半电池,测试并研究其储锂、储钠性能。实验结果表明:Fe_(3)O_(4)@NC相比Fe_(7)S_(8)@NC展现出了更高的可逆比容量和更优异的高倍率储锂循环性能,在2 A·g^(-1)的电流密度下,循环300圈,其可逆比容量可分别维持在1083和859 mAh·g^(-1);作为钠离子电池负极材料,Fe_(3)O_(4)@NC相比Fe_(7)S_(8)@NC展现出了更平稳的循环稳定性,而Fe_(7)S_(8)@NC出现容量明显上升的趋势。在1 A·g^(-1)的电流密度下,循环350圈后,二者的电池容量分别为100和259 mAh·g^(-1);其优异的储锂、储钠性能主要取决于Fe_(3)O_(4)和Fe_(7)S_(8)纳米棒与氮掺杂碳层的协同作用。N-doped carbon coated Fe_(3)O_(4)and Fe_(7)S_(8)composite materials(Fe_(3)O_(4)@NC and Fe_(7)S_(8)@NC)were prepared by three-steps synthesis strategy.First,the FeOOH nanorod was prepared by a facile hydrothermal method.Second,the FeOOH@PDA composite was obtained via the room temperature polymerization reaction.Third,the Fe_(3)O_(4)@NC and Fe_(7)S_(8)@NC were finally prepared by the subsequent heat treatment.A series of characterization techniques containing XRD,Raman spectra,XPS,SEM,and TEM were employed to analyze the structures and morphologies of Fe_(3)O_(4)@NC and Fe_(7)S_(8)@NC.The Fe_(3)O_(4)@NC and Fe_(7)S_(8)@NC were used as the anode materials to assemble the button cells,and their electrochemical performances for lithium ion batteries and sodium ion batteries were tested and discussed.Experimental results indicate that Fe_(3)O_(4)@NC exhibits higher reversible capacities and more excellent lithium storage performances than Fe_(7)S_(8)@NC.At 2 A·g^(-1)for 300 cycles,the reversible capacity can maintain at 1083 and 859 mAh·g^(-1).As anode materials for sodium ion batteries,Fe_(3)O_(4)@NC shows more stable cycling performance than Fe_(7)S_(8)@NC.At a high current density of 1 A·g^(-1),the reversible capacities are 100 and 259 mAh·g^(-1)up to 350 cycles.The good lithium or sodium storage performances can be attributed to the synergistic effect of N-doped carbon and Fe_(3)O_(4)or Fe_(7)S_(8)nanorods.

关 键 词：羟基氧化铁 氮掺杂碳 Fe_(3)O_(4) Fe_(7)S_(8) 锂/钠离子电池 

分 类 号：O645.1[理学—物理化学]