三维有序大孔α-Fe_2O_3的制备及电化学性能研究  

Fabrication and Electrochemical Properties of Three-dimensionally Ordered Macroporous α-Fe_2O_3

作　　者：赵铁鹏[1] 高德淑[1] 雷钢铁[1] 李朝晖[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用省部共建教育部重点实验室,湘潭411105

出　　处：《化学学报》2009年第17期1957-1961,共5页Acta Chimica Sinica

基　　金：湖南省自然科学基金(No.06JJ4093);湘潭市科技局(No.06KH01041)资助项目

摘　　要：通过聚苯乙烯(PS)胶晶模板法合成了三维有序大孔(3DOM)α-Fe2O3,运用扫描电镜、热重分析、X射线衍射、电化学充放电等多种方法对其结构和性能进行了表征和研究.SEM表明PS胶晶模板和3DOMα-Fe2O3呈周期性排列.合成的3DOMα-Fe2O3为三维有序多孔网状结构,具有球型和六边形的孔隙形貌,其孔径大小约为(115±10)nm;孔壁由α-Fe2O3纳米晶粒组成,壁厚为20～30nm.XRD图谱表明经过煅烧除去模板后,形成了纯α-Fe2O3相.当3DOMα-Fe2O3作为锂离子电池负极材料时,首次放电充电容量分别高达1880和1130mAh·g-1,20次循环后可逆容量依然高达631mAh·g-1,库仑效率大于90%.Three-dimensionally ordered macroporous （3DOM） a-Fe203 was synthesized by using polystyrene （PS） colloidal crystal as templates. The character of 3DOM α-Fe2O3 was measured by scanning electron microscopy （SEM）, thermogravimetry （TG）, X-ray diffraction （XRD） and electrochemical measurements. SEM images showed that the PS colloidal crystal template and the 3DOM α-Fe2O3 were arrayed periodically in face. The synthesized 3DOM α-Fe2O3 microparticles were composed of sphere or hexagonally porous morphologies interconnected through thin walls formed by nanocrystals of α-Fe2O3. The macropore diameters of the 3DOM α-Fe2O3 were about （115±10） nm and the pore wall thicknesses were between 20-30 nm. X-ray diffraction indicated that a pure α-Fe2O3 phase was produced after calcination. When the 3DOM α-Fe2O3 microparticles were used as anode materials for lithium ion batteries, they exhibited extraordinarily high initial discharge and charge capacities of 1880 and 1130 mAh·g^-1 respectively. After 20th cycle, their reversible capacity could be as high as 631 mAh·g^-1, with a coulombic efficiency of 〉90%.

关 键 词：模板 大孔 Α-FE2O3 锂离子电池 负极材料 

分 类 号：O614.811[理学—无机化学] TM912[理学—化学]