리튬 황 전지용 Sponge 형태의 S@ZIF 67/rGO 양극재의 전기화학 특성 분석
The Electrochemical Properties of Sponge Type S@ZIF67/rGO as the Cathode Material for Lithium Sulfur Batteries
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초록
본 연구에서는 유황의 절연 특성 및 리튬 폴리 설파이드 용출로 인해 전지 수명 저하를 최소화하기 위해 ZIF67/rGO를 사용하였다. rGO로 포장이 된 ZIF67는 탄소 스펀지 내에 공간을 더많이 만들어주며, 다량의 유황을 보관할 수 있다. 유황@ZIF67/rGO 복합체를 합성하고, 스펀지형태로 제조함으로써 유황의 담지 능력을 향상시켰다. 그 결과로서 높은 초기용량을 보였으며, 약 1093 mAh g–1의 값을 나타내며 100사이클 후에 84%의 용량유지율을 보임을 확인하였다. 코발트와 탄소의 복합화를 통하여 유황과의 상호작용이 높아 ZIF67/rGO는 리튬유황전지의 양극활물질인 유황을 담지하는 담지체로서의 높은 성능을 나타남을 확인하였으며, 높은 초기용량과용량유지율이 개선되었음을 확인하였다.
Abstract
In this study, ZIF67/rGO was used to minimize the battery life degradation due to the insulating properties of sulfur and the elution of lithium polysulfide. ZIF67 wrapped in rGO creates more space within the carbon sponge and can hold a large amount of sulfur. The sulfur@ ZIF67/rGO composite was synthesized and prepared as a sponge to enhance the sulfur retention capacity. The result showed a high initial capacity, with a value of about 1093 mAh g–1 and a capacity retention rate of 84% after 100 cycles. The high interaction with sulfur through the complexation of cobalt and carbon confirmed that ZIF67/rGO exhibits high performance as a carrier for sulfur, the anode active material of lithium-sulfur batteries, and the high initial capacity and improved capacity retention rate were confirmed.
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