Journal of the Korean Industrial and Engineering Chemistry, Vol.18, No.5, 449-453, October, 2007
리튬 이온 전지 탄소부극용 Sn-GIC의 합성과 그 전기화학적 특성
Synthesis of Sn-GIC for Carbon Electrode of Lithium Ion Battery and Its Electrochemical Characteristics
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초록
리튬이온이차전지에 사용되는 탄소부극의 성능 향상을 위하여 새로운 탄소부극물질로서 Sn-GIC (Graphite intercalated compound)를 합성하고 그 전기화학적 특성을 조사하였다. 합성시 SnCl2 수용액의 농도가 증가할수록, 그리고 수용액에 함침한 후 건조한 시료의 열처리 온도가 증가할수록 흑연에 삽입되는 Sn의 함량이 증가하였으며, 또한 흑연 내부로 삽입된 Sn의 함량이 증가함에 따라 이를 부극활물질로 사용한 cell의 초기 방전용량은 증가하였다. 가장 우수한 특성을 나타내는 1.0M SnCl2 수용액에 함침한 후 900 ℃에서 열처리하여 제조한 Sn-GIC는 346 mA/g의 초기용량과 10 cycle 후 13%의 용량감소를 나타내었다.
Synthesis of Sn-GIC (Graphite intercalated compound) and its electrochemical characteristics were investigated to find a method for enhancing the performance of carbon anode of lithium ion battery. The content of Sn intercalated in graphite interlayer increased with increase of concentration of SnCl2 solution and increase of the heat treatment temperature of dried graphite after dipped in SnCl2 solution, respectively. And initial discharge capacity increased upon increase of intercalated Sn content. Sn-GIC with excellent electrochemical performance, which can be synthesized by heat treatment at 900 ℃ after dipped in 1.0 M SnCl2 solution, showed 356 mAh/g of initial discharge capacity and 13% of capacity decay after 10 cycles.
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