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Acta Phys. -Chim. Sin.  2010, Vol. 26 Issue (03): 567-572    DOI: 10.3866/PKU.WHXB20100247
ELECTROCHEMISTRY     
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
College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China
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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 wordsLithium ion battery      Cathode material      Doping      LiNi1/3Co2/3-xAlxO2     
Received: 03 September 2009      Published: 14 January 2010
MSC2000:  O646  
  TQ152  
Corresponding Authors: CHANG Zhao-Rong     E-mail: czr_56@163.com
Cite this article:

CHANG Zhao-Rong, YU Xu, TANG Hong-Wei, WEI Wen-Qiang, DAI Dong-Mei. Influence of Al Doping Content on the Structure and Electrochemical Properties of LiNi1/3Co2/3-xAlxO2. Acta Phys. -Chim. Sin., 2010, 26(03): 567-572.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20100247     OR     http://www.whxb.pku.edu.cn/Y2010/V26/I03/567

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