Citation: 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[J]. Acta Physico-Chimica Sinica, ;2010, 26(03): 567-572. doi: 10.3866/PKU.WHXB20100247
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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.
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Keywords:
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Lithium ion battery
, - Cathode material,
- Doping,
- LiNi1/3Co2/3-xAlxO2
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