α-Fe2O3空心球的简易合成及其储锂性能研究  

Facile synthesis of hollow spheresα-Fe2O3 and its lithium performance

作　　者：孟祥贺 唐卯星 方玉成 刘伶俐 MENG Xiang-he;TANG Mao-xing;FANG Yu-cheng;LIU Ling-li(Hefei University,College of Energy,Materials and Engineering,Hefei 230601,China;Sichuan University,Chemistry College,Chengdu 610064,China)

机构地区：[1]合肥学院,能源材料与化工学院,安徽合肥230601 [2]四川大学,化学学院,四川成都610064

出　　处：《化学研究与应用》2020年第8期1466-1473,共8页Chemical Research and Application

基　　金：合肥学院人才基金(03964617E2)。

摘　　要：利用葡萄糖作为模板,与Fe^3+溶液水热合成、高温煅烧后获得了空心球形的Fe2O3。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及物理吸附仪对其进行物相结构、形貌及多孔性分析。锂离子电池电化学性能测试结果表明,与立方型α-Fe2O3相比,空心球状的α-Fe2O3负极材料表现出更加优异的循环稳定性和倍率性能。在200 mA g^-1电流密度下首次放电比容量为1295 mAh g^-1,首次库伦效率为81%。在500 mA g^-1电流密度下,空心球状α-Fe2O3电极首圈比容量高达1249 mAh g^-1,首次库伦效率达到73%;循环500圈后,容量保持率为84%,库伦效率达98%以上。在1 A g^-1、2A g^-1大倍率电流密度下,放电比容量分别为1048 mAh g^-1、992 mAh g^-1,容量保持率分别达到90%与85%。因此,空心结构α-Fe2O3负极材料不仅可以有效抑制充放电过程中电极的体积膨胀,还可以缩短锂离子的传输路径,提高电极材料的电化学性能。In this paper,hollow sphericalα-Fe2O3 was synthesized by hydrothermal reaction of Fe^3+solution with glucose then calcined under high-temperature using glucose as the template.The phase structure,morphology and porosity were analyzed by means of X-ray diffraction(XRD),scanning electron microscope(SEM)and physical adsorption instrument.Compared with cubicα-Fe2O3,the electrochemical performance test results show that the hollow sphericalα-Fe2O3 anode material has better cyclic stability and multiplier performance.At 200 mA g^-1 current density,the first discharge capacity is 1295 mA h g^-1 and the first coulombic efficiency is 81%.At the current density of 500 mA g^-1,the specific capacity of the first recycle of the hollow sphericalα-Fe2O3 electrode achieved 1249 mA h g^-1 and the coulomb efficiency reached 73%.After 500 cycles,the capacity retention rate is 84%and the average coulombic efficiency is over 98%.More significantly,the discharge specific capacity attained 1048 mAh g^-1 and 992 mAh g^-1 even at 1 A g^-1 and 2 A g^-1 respectively,and the capacity retention rate reached 90%and 85%.Therefore,the hollow structureα-Fe2O3 anode material can not only effectively inhibit the volume expansion of the electrode during charging and discharging,but also shorten the transmission path of lithium ions and improve the electrochemical performance of the electrode material.

关 键 词：FE2O3 葡萄糖 空心球 锂离子电池 

分 类 号：O614.8[理学—无机化学]