| 학회 |
한국공업화학회 |
| 학술대회 |
2015년 봄 (04/29 ~ 05/01, BEXCO (부산)) |
| 권호 |
19권 1호 |
| 발표분야 |
전기화학_포스터 |
| 제목 |
Encapsulating Sulfur into Polyaniline-Decorated Mesoporous Carbon as Cathode Material for Lithium Sulfur Batteries |
| 초록 |
The demand of high energy storage for large grid application and transportation intensifies the interest for new materials with high energy density, long life span and low cost. Lithium sulfur (Li-S) battery is expected to promote the state-of-art battery technologies and upgrade the capability that current batteries record, as it can conduct a high theoretical capacity of 1675 mAh g-1 and a high energy density of 2600 Wh kg-1.Although the studies of Li-S batteries could be traced back to 1960s, this system is still under realization as many problems remain unsettled. The insulating nature of both sulfur and its reduction products, polysulfide species, leads to low active material utilization. Also, the soluble lithium polysulfides (Li2Sx,4≤x≤8) generated during the discharge process easily escape from the electrode to dissolve in the liquid electrolyte forming “shuttle” phenomenon between cathode and anode, resulting in the loss of active material and increased resistance in cells. Many efforts have been made to tackle these drawbacks. In this work, A polyaniline (PANi)-coated mesoporous carbon composite was synthesized by direct polymerization of aniline monomer on mesoporous ketjenblack (KB) carbon. It is found that the mass percentage of PANi plays a critical role in the cycle stability of lithium sulfur batteries. The coated PANi is capable of enhancing the intimate contact of sulfur with carbon and trapping polysulfides, which improves the utilization of active material. The cell with the composite containing 30% of PANi shows an improved cyclability of 675 mAh g-1 after 200 cycles at 0.1 C-rate, demonstrating promising applications in lithium sulfur batteries with high energy density. |
| 저자 |
김미소, Xiaohui ZHAO, 유형민, Ying LIU, James MANUEL, Ghanshyam S CHAUHAN, 안주현, 조권구, 김기원, 안효준
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| 소속 |
Gyeongsang National Univ. |
| 키워드 |
Lithium sulfur batteries; polyaniline; mesoporous carbon
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| E-Mail |
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