CRCU

Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (4): 686-690.

• Articles • Previous Articles     Next Articles

Structure Evolution and Electrochemical Performance of Al2O3-coated LiNi0.4Co0.2Mn0.4O2 During Charge-discharge Cycling

LIU Hao-han, ZHANG Jian, LOU Yu-wan, YANG Chuan-zheng, XIE Xiao-hua, XIA Bao-jia   

  1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, P. R. China
  • Received:2011-11-24 Revised:2012-02-27 Online:2012-07-25 Published:2012-07-25
  • Contact: baojia xia E-mail:xiabj@mail.sim.ac.cn
  • Supported by:

    Supported by the Project of Shanghai Committee of Science and Technology, China(Nos.1052nm00100, 09ZR1437600).

PDF (PC)

Abstract: Several lithium-ion batteries of 18650-type were assembled with pristine or Al2O3-coated LiNi0.4Co0.2Mn0.4O2(NCM) as cathode material and mesocarbon microbeads(MCMB) as anode material. The cycling performance of the batteries was examined under 25℃ at a 2C rate within a potential range of 2.75-4.20 V. The changes of the crystal structure, the lattice parameter, the mean crystallite size, and the mean micro-strain of pristine NCM and Al2O3-coated NCM during the charge-discharge cycling were determined by X-ray diffraction(XRD). The results indicate that the bulk structure of Al2O3-coated NCM is more stable than that of pristine NCM, which leads to the better cycling performance of Al2O3-coated NCM compared to that of pristine NCM.

Key words: LiNi0.4Co0.2Mn0.4O2, Al2O3-coated, Cycling performance, Bulk structure