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HWAHAK KONGHAK,
Vol.41, No.1, 68-74, 2003
Vol.41, No.1, 68-74, 2003
LiNiO2의 합성 최적조건 확립 및 과량의 리튬함량과 Al 도핑이 전기화학적 특성에 미치는 영향
Optimization of LiNiO2 Synthetic Condition and Effect of Excess Lithium and Al Doping on Electrochemical Characteristics of the Lithium Nickel Oxides
졸-겔법을 이용하여 LiNiO2, Li1+xNiO2(x=0.00-0.05) 및 LiAlyNi1-yO2(y=0.0-0.3)을 합성하였다. 우수한 전기화학적 성능을 보이는 LiNiO2를 합성하기 위해 금속이온에 대한 아디프산의 몰비의 영향, 리튬의 함량, Al의 도핑의 영향을 실험하였다. 그 결과 합성된 LiNiO2는 아디프산과 총 금속이온의 몰비가 1.0일 때 우수한 결정 특성을 나타내었다. 겔 전구체가 분해되는 동안 발생하는 기체를 분석한 결과 LiNiO2의 결정성을 향상시키는데 산소가 매우 중요한 역할을 하는 것을 관찰하였다. 합성한 Li1+xNiO2는 모두 전형적인 층상구조를 나타내었으나 리튬함량이 증가하면 전기화학적 특성이 저하됨을 관찰할 수 있었다. Al을 도핑한 시료는 도핑되지 않은 LiNiO2보다 초기용량은 낮지만 우수한 사이클 특성을 나타내었다. Al 도핑된 LiAlyNi1-yO2는 고온에서도 전기화학적 특성이 우수함을 관찰할 수 있었다.
LiNiO2, Li1+xNiO2(x=0.00-0.05) and LiAlyNi1-yO2(y=0.0-0.3) powders were synthesized using a sol-gel method. To synthesize LiNiO2 with a good electrochemical performance, the experiments were carried out as function of the molar ratio of adipic acid to total metal ions, excess Li content, and Al doping. The synthesized LiNiO2 powders showed a good crystal quality when the molar ratio of adipic acid to total metal ions was 1.0. The analysis of gas composition evolved during the decomposition of gel precursors revealed that oxygen played an important role in improving the crystal quality of LiNiO2 powders. All the prepared Li1+xNiO2 powders had a typical LiNiO2 layered structure, but the electrochemical performance was degraded with the increasing the lithium content. Al-doped LiAlyNi1-yO2 powders were better than LiNiO2 powders in cyclicality
though it showed a low initial discharge capacity. The Al doped LiAlyNi1-yO2 powders presented a good electrochemical performance even at higher temperatures.
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