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LiMn2-2xLixNixO4(0≤X≤0.1)阴极材料的结构和电化学性能

涂健; 曹高劭; 庄大高; 赵新兵   

  1. 浙江大学材料科学与工程系, 杭州 310027
  • 收稿日期:2004-08-31 修回日期:2004-10-10 出版日期:2005-09-20 网络出版日期:2005-09-20

Structural and Electrochemical Characterization of LiMn2-2xLixNixO4 (0≤x≤0.1) Cathode Materials

TU Jian; CAO Gao-Shao; ZHUANG Da-Gao; ZHAO Xin-Bing   

  1. Department of Materials Science and Engineering; Zhejiang University; Hangzhou 310027, China
  • Received:2004-08-31 Revised:2004-10-10 Published:2005-09-20 Online:2005-09-20

摘要: 采用高温固相法,合成了LiMn2-2xLixNixO4(x=0.03、0.05、0.075、0.100)试样.用X射线衍射(XRD)和场发射扫描电镜(FESEM)对试样的晶体结构和形貌进行了表征.从试样的充放电性能,室温和高温下(55℃)循环性能等方面,并结合X射线吸收精细结构(X-rayabsorptionfinestructure,XAFS)所得到的试样中MnO6八面体中键长的变化分析了锂镍协同掺杂对尖晶石结构的稳定作用.实验表明:与尖晶石LiMn2O4相比,LiMn2-2xLixNixO4试样在室温和55℃时具有良好的容量保持能力,是由于Li,Ni协同掺杂对试样的结构起了稳定作用.

关键词: 锂离子电池, 阴极材料, 双掺杂, 结构分析

Abstract: Lithium and nickel co-doped LiMn2-2xLixNixO4 cathode materials (x= 0, 0.03, 0.05, 0.075, 0.1) were synthesized by a high temperature solid-state reaction route. The microstructures and morphologies of the samples were characterized by X-ray powder diffraction, X-ray absorption fine structure analysis and field emitted scanning electronic microscopy. The bond lengths of the MnO6 octahedrons and the electrochemical performances in both room temperature and elevated temperature (55℃) were characterized and discussed in comparison with LiMn2O4 spinel. The result reveals that LiMn2-2xLixNixO4 samples have a good reversibility. It is suggested that the co-doping of lithium and nickel in LiMn2O4-based compounds could stabilize the spinel structure and improve the capacity retention of the cathode materils.

Key words: lithium ion battery, cathode material, co-doping, structure analysis

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