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LiLaxMn2-xO3．95F0．05的结构及电化学性能研究

Structure and Electrochemical Performance Studies of LiLa_xMn_(2-x)O_(3.95)F_(0.05)
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摘要 采用X-射线衍射(XRD)、扫描电子显微分析(SEM)和电化学测试对高温固相合成尖晶石LiLaxMn2-xO3.95F0.05(x=0,0.01,0.02,0.03,0.04)结构和电化学性能作了研究.La的掺杂稳定了材料的八面体结构,使LiLaxMn2-xO3.95F0.05的循环性能优于LiMn2O4和LiMn2O3.95F0.05,同时F的掺杂保证了材料的初始容量,LiLa0.02Mn1.98O3.95F0.05充放电30循环后,放电比容量保持在114.6mAh·g-1,使得材料具有较好的性能. The structural and electrochemical properties of various LiLaxMn2-xO3.95F0.05 spinels were studied by X-ray diffraction （XRD）, scanning electron microscope （SEM） and electric -chemical testing. LiLaxMn2-xO3.95F0.05 （x=0, 0.01,0.02,0.03,0.04） spinels were synthesized by a solid-state reaction method. Lanthanide substitution in LiLaxMn2-xO3.95F0.05 led to well-developed crystallization with octahedral morphology. In addition, LiLaxMn2-xO3.95F0.05 showed superior cycling performance than LiMn2O4 and LiMn2O3.95F0.05. Fluorine substitution ensure the initial capacity, after 30 cycles, The capacities of LiLa0.02Mn1.98O3.95F0.05 were 114.6 mAh·g^-1, which make the performance better. 4figs., lteb., 14refs.
作者 刘心宇 蒙冕武 吕罡 黄煌 廖钦洪 江恩源
机构地区 桂林电子科技大学信息材料科学与工程系 中南大学材料科学与工程学院 广西师范大学环境与资源学院
出处 《湖南科技大学学报（自然科学版）》 CAS 北大核心 2008年第4期31-34,共4页 Journal of Hunan University of Science And Technology：Natural Science Edition
基金 广西自然科学基金(0542012) 广西研究生教育创新计划项目(2007105950805M24)
关键词 锂离子电池 LIMN2O4 正极材料 镧 li-ion batteries LiMn2O4 lithium manganese oxide lanthanide
分类号 TM912.9 [电气工程—电力电子与电力传动]
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参考文献8

  • 1[1]Subramania A,Angayarkanni N,Vesudevan T,et al.Effect of PVA With Various Combustion Fuels in Sol-gel Thermolysis Process for the Synthesis of LiMn2O4 Nanoparticles for Li-ion Batteries[J].Materials Chemistry and Physics,2007,102:19-23.
  • 2[2]TU Jian,ZHAO Xin-bing,ZHUANG Da-gao,et al.Studies of Cycle Ability of LiMn2O4 and LiLa0.01Mn1.99O4 as Cathode Materials for Li-ion bBattery[J].Physica B,2006,382:129-134.
  • 3[4]Dsa S R,Fachini I R,Majumder S B,et al.Structural and Electrochemical Properties of Nanocrystalline LixMn2O4 Thin Film Cathodes (x= 1.0-1 A)[J].Journal of Power Sources,2006 (158):524-528.
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湖南科技大学学报（自然科学版）
2008年 第4期

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