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- W771760640 abstract "초음파분무열분해법과 한 단계의 후열처리로 이차상이 없는 Al이 첨가된 <TEX>$Li(Ni_{1/3}Co_{1/3}Mn_{1/3-x}Al_x)O_2$</TEX> (x=0.0, 0.005, 0.01. 0.05) 리튬이차전지용 양극활물질을 합성하였다. 합성된 분말은 Al의 첨가량이 많아짐에 따라서 <TEX>$I_{003}/I_{104}$</TEX> 비는 감소하고 입자가 커지는 경향을 보였다. 상온에서 전류밀도 1C의 rate로 <TEX>$3.0sim4.5V$</TEX> 범위에서 충방전 시험한 결과, Al 치환량이 0.5와 1.0 at%에서는 초기용량이 180과 <TEX>$184mAhg^{-1}$</TEX>으로 치환하지 않았을 때의 <TEX>$182mAhg^{-1}$</TEX>과 차이가 없었으며, 싸이클 특성도 치환하지 않은 것과 0.5, 1.0 at% 치환한 조성에서 각각 81, 77, 81%의 방전용량이 유지되었다. 그러나 <TEX>$3.0sim4.6V$</TEX>에서는 치환효과가 확실하게 나타나서, 50 싸이클 후의 치환하지 않은 것의 방전용량은 초기용량의 30%가지 감소한데 비하여 Al을 0.5 at% 치환한 것은 70%를 유지하였다. 치환에 의한 싸이클 특성 향상은 XPS 분석 결과 Al 치환이 <TEX>$Mn^{3+}$</TEX>의 양을 감소시켰기 때문인 것으로 사료되었다. Cathode materials of Al-doped <TEX>$Li(Ni_{1/3}Co_{1/3}Mn_{1/3-x}Al_x)O_2$</TEX> (x=0.0, 0.005, 0.01 0.05) for lithium ion batteries were synthesized with ultra-sonic spray pyrolysis method and single-step heat treatment. No secondary phases were found in all synthesized powders. The intensity ratio of <TEX>$I_{003};to;I_{104}$</TEX>, however, slightly decreased and the particle size increased with the Al contents. The cells with bare, 0.5 and 1.0 at% Al-doped powders showed the initial discharge capacities of 182, 180 and <TEX>$184mAhg^{-1}$</TEX> in a voltage range of <TEX>$3.0sim4.5V$</TEX> at 1C rate, and the capacity retentions of 81, 77 and 78% at the end of 30 cycles, respectively. But in the voltage range of <TEX>$3.0sim4.6V$</TEX>, the Al-doping significantly enhanced the cycle stability. For example, the discharge capacity after 50 cycles was maintained to 70% in the 0.5 at% Al-doped sample compared to only 30% in no doped sample. The improvement of the cycle stability was thought to be due to <TEX>$Mn^{3+}$</TEX> ion decrease as the Al doping from the XPS analysis results." @default.
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- W771760640 date "2006-05-01" @default.
- W771760640 modified "2023-09-27" @default.
- W771760640 title "Electrochemical Properties of Al Doped Li(Ni1/3Co1/3Mn1/3-xAlx)O2, Cathode Materials" @default.
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- W771760640 doi "https://doi.org/10.5229/jkes.2006.9.2.064" @default.
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