Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (Supp): 56-59.doi: 10.3866/PKU.WHXB2007Supp13

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Performance of Nonstoichiometric Li1+xCoO2 Cathode Materials

JIANG Wei-Jun; Sai-Xi-Ya-Le-Tu; Wu-Yun-Bi-Li-Ge; QI Lu; SHANG Shi-Bo   

  1. CITIC Guoan Mengguli New Engery Technology Co. Ltd., Beijing 102200, P. R. China; New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemical and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-01-04
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

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Abstract: LiCoO2 and nonstoichiometric Li1+xCoO2(x=0.02, 0.05) cathode materials were synthesized under various nLi/nCo ratio. X-rayDiffraction (XRD), scanning electronic microscope (SEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), laser particle size distribution, BET and electrochemical analysis were used to characterize the materials. The results showed that excess Li2CO3 added could smooth particles’surface, enlarge particles’size, reduce particles’ specific surface area and increase materials’density. The results of electrochemical analysis also indicated that excess Li in LiCoO2 could suppress the disadvantageous crystal phase change, stabilize materials’ structure and decrease the average loss ratio to 1.3‰ from 1.9‰ during 50 cycles.

Key words: Lithium-ion secondary batteries, Cathode materials, LiCoO2, Nonstoichiometry