Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2593-2599.doi: 10.3866/PKU.WHXB20111104

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Improvement of LiNi1/3Co1/3Mn1/3O2 Cathode Materials by Nano-MgO Doping

LI Jie-Bin1,2, XU You-Long1, XIONG Li-Long1, WANG Jing-Ping1   

  1. 1. International Center for Dielectric Research, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China;
    2. Shaanxi Applied Physics and Chemistry Research Institute, Xi'an 710061, P. R. China
  • Received:2011-06-07 Revised:2011-08-03 Published:2011-10-27
  • Contact: XU You-Long

Abstract: Nano-sized M3O4 (M=Ni1/3Co1/3Mn1/3) powder with a spinel structure was prepared by sintering co-precipitated M(OH)2 at 500°C for 5 h. The so-obtained M3O4 was then mixed with LiOH and different amounts of nano-MgO. The mixture was sintered at 850°C for 24 h to synthesize Li(Ni1/3Co1/3Mn1/3)1-xMgxO2 (x=0, 0.01, 0.02, 0.03, 0.04,0.05) cathode materials. The lattice parameters increased while the diffusion coefficients of Li+ ion showed an increasing and then decreasing trend with an increase in the amount of Mg substitution. Li(Ni1/3Co1/3Mn1/3)0.98Mg0.02O2 had the highest Li+ ion diffusion coefficients, which were 29.20× 10-11 cm2·s-1 for Li+ de-intercalation and 4.760×10-11 cm2·s-1 for Li+ intercalation. Its discharge capacity at 3C rate was 139.3 mAh·g-1, which is 9.5 mAh·g-1 higher than that of the pristine material. Furthermore, its cycle performance was also improved significantly compared with the un-doped counterpart.

Key words: Lithium ion battery, Cathode material, LiNi1/3Co1/3Mn1/3O2, Mg-doping, Diffusion coefficient of Li+ ion


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