三维大骨架结构FeSe_(2)材料的制备及储锂机理研究  

Preparation of FeSe_(2) Material with Three-dimensional Large Framework Structure and Study on Its Lithium Storage Mechanism

作　　者：胡思思 刘倩 李文 王波[1] HU Sisi;LIU Qian;LI Wen;WANG Bo(Hebei Key Laboratory of Flexible Functional Materials,School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050000,China)

机构地区：[1]河北科技大学材料科学与工程学院,河北省柔性功能材料重点实验室,石家庄050000

出　　处：《材料导报》2022年第8期1-4,共4页Materials Reports

基　　金：国家自然科学基金(22008053,52002111);河北省重点研发计划(20310601D,205A4401D)。

摘　　要：为了提高锂离子电池的比容量和延长其安全寿命,利用化学吹塑和烧结硒化法制备三维大骨架FeSe_(2)材料,并通过X射线衍射光谱(XRD)、扫描电镜(SEM)、透射电镜(TEM)和X射线能谱分析(EDS)等分析手段对制备的材料进行了表征。结果表明,FeSe_(2)材料呈现稳定的三维大骨架蜂窝状结构且元素分布均匀。以循环伏安法(CV)和恒流充放电法分析了所制备材料作为锂离子电池负极的储锂性能,结果表明,在100 mA/g电流密度下锂离子电池比容量第二圈可达到827.9 mAh/g;在500 mA/g电流密度下长循环1000圈后,比容量较第二圈增长了30.35%,电池表现出较高的比容量和更长的循环寿命。In order to improve the specific capacity and prolong safety life of lithium-ion batteries,three-dimensional large-frame FeSe_(2)composite materials were prepared by chemical blow molding and sintering selenization.The prepared materials were characterized by X-ray diffraction spectroscopy(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM),and X-ray energy spectroscopy(EDS).The results show that the FeSe_(2)material exhibits a stable three-dimensional large-frame honeycomb structure with the elements evenly distributed.Cyclic voltammetry(CV)and galvanostatic charge-discharge test were used to analyze the lithium storage performance of the prepared material as the anode electrode of lithium-ion battery.The results show that the specific capacity of lithium-ion battery can reach 827.9 mAh/g at the second round at the current density of 100 mA/g.After a long cycle of 1000 cycles at the current density of 500 mA/g,the specific capacity increases by 30.35%compared to the second cycle,the battery showing higher specific capacity and longer cycle life.

关 键 词：三维大骨架 FeSe_(2) 锂离子电池 长循环寿命 

分 类 号：TQ152[化学工程—电化学工业]