| 학회 |
한국재료학회 |
| 학술대회 |
2019년 가을 (10/30 ~ 11/01, 삼척 쏠비치 호텔&리조트) |
| 권호 |
25권 2호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Passivating lithium metal anode with MoS2 for high performance lithium-sulfur batteries |
| 초록 |
Lithium (Li) metal is considered an optimal anode material for the next-generation high-capacity batteries such lithium-sulfur (Li-S) batteries. However, the practical use of Li metal in energy storage application remains controversial due to the parasitic growth of Li dendrites and high reactivity of Li with electrolyte and other active species generated during charge-discharge cycles. Several approaches have been attempted to suppress the growth of such dendrites and to protect Li surface from corrosion; however, challenges including repetitive kinetic reactions of polysulfides at the anode still exist leading to an increase in electrode impedance that hinders the practical applications of Li-S batteries. Here, we utilize a thin layer of molybdenum disulfide (MoS2) as a protective layer for Li metal anodes. With the Li-intercalated layer of MoS2 formed, stable Li electrodeposition is realized with the nucleation sites for dendrite growth inhibited. Our method to control the growth of Li dendrites is analyzed by the diffusion mechanism of Sand’s time with Li deposition. The assembled Li-S cell utilizing the MoS2 coated Li anodes and the 3D carbon nanotube-sulfur cathodes provided superior electrochemical performance; it operated at a high specific energy density (~589 Wh kg−1) with excellent capacity retention (over 1000 cycles) as well as with an average Coulombic efficiency of ~98%. The improvement in cycle life and the suppression of lithium dendrite growths through the passivation of Li metal electrodes reveal a new direction for the advancement of Li metal anode in rechargeable batteries. |
| 저자 |
Eunho Cha1, Wonbong Choi2, Do Kyung Kim1
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| 소속 |
1KAIST, 2Univ. of North Texas |
| 키워드 |
<P>Li-S battery; anode protection; transition metal dichalcogenides</P>
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| E-Mail |
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