Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (12): 1948-1953.doi: 10.3866/PKU.WHXB20071222

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Preferred Orientation of Crystals and the Intensity Ratios of XRD Peaks of Cathode Material LiCoO2

CHEN Yong-Chong; XU Xing-Jun; CUI Hong-Zhi; DAI Ke-Hua; SONG Zhao-Shuang; JIANG Wei-Jun; QI Lu   

  1. Solid State Reaction &Diffusion Laboratory, College of Materials Science &Engineering, Shandong University of Science & Technology, Qingdao 266510, Shandong Province, P. R. China; New Energy Material & Technology Laboratory, Department of Applied Chemistry, College of Chemistry &Molecular Engineering, Peking University, Beijing 100871, P. R. China; CITIC GUOAN Mengguli New Energy Technology Company Ltd. (MGL), Beijing 102200, P. R. China
  • Received:2007-09-17 Revised:2007-10-08 Published:2007-11-30
  • Contact: CHEN Yong-Chong

Abstract: LiCoO2 samples were synthesized by high temperature solid-state reaction method, characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The reflection and transmission XRDdata of different commercial LiCoO2 materials proved that the intensity ratio of (104) to (003) (I(104)/I(003)) reflects the degree of crystal orientation, not the order of Li and Co positions in LiCoO2 crystals. The higher the crystal orientation degree was, the smaller the ratio I(104)/I(003) would be. Experimental data also indicated this ratio value should be about 95%for the LiCoO2 crystals with no preferred orientations. Therefore, the intensity ratio I(104)/I(003) can not be considered as the main evidence for the position order of Li and Co in LiCoO2 crystals. The confusion on the intensity ratios of XRD peaks of cathode material LiCoO2 for Li-ion batteries was clarified.

Key words: Li-ion battery, Cathode material, LiCoO2, Preferred orientation