Citation:
LI Jie-Bin, XU You-Long, XIONG Li-Long, WANG Jing-Ping. Improvement of LiNi1/3Co1/3Mn1/3O2 Cathode Materials by Nano-M Doping[J]. Acta Physico-Chimica Sinica,
;2011, 27(11): 2593-2599.
doi:
10.3866/PKU.WHXB20111104
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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-M . 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.
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