Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (03): 567-572.doi: 10.3866/PKU.WHXB20100247

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Influence of Al Doping Content on the Structure and Electrochemical Properties of LiNi1/3Co2/3-xAlxO2

CHANG Zhao-Rong, YU Xu, TANG Hong-Wei, WEI Wen-Qiang, DAI Dong-Mei   

  1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China
  • Received:2009-09-03 Revised:2009-11-13 Published:2010-03-03
  • Contact: CHANG Zhao-Rong E-mail:czr_56@163.com

Abstract:

The layerd cathode materials LiNi1/3Co2/3-xAlxO2 (x=1/12, 1/6, 1/3, 1/2, 7/12) for lithiumion battery has been successfully synthesized using eutectic lithium salts of 0.38LiOH·H2O-0.62LiNO3 mixed with Ni1/3Co1/3Al1/3(OH)2 as a precursor. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical performance tests. Results show that the LiNi1/3Co2/3 -xAlxO2 can be maintained as a well-layered α-NaFeO2 structure in the range of 1/12≤x≤1/3. At x>1/3, a miscellaneous phase is present. The LiNi1/3Co1/3Al1/3O2 products have the highest crystallinity, the least cation mixing effect and the most uniform particle size with a tap-density of 2.88 g·cm-3. Additionally, the initial discharge capacity of the product was 151.5 mAh·g -1 and after 50 cycles, 91.4%of the initial discharge capacity was maintained. The reversible capacities of the products are 133.7 and 120.9 mAh·g-1 at 1C and 2C discharge rates, respectively.

Key words: Lithium ion battery, Cathode material, Doping, LiNi1/3Co2/3-xAlxO2

MSC2000: 

  • O646