| 학회 |
한국재료학회 |
| 학술대회 |
2019년 봄 (05/15 ~ 05/17, 평창 알펜시아 리조트) |
| 권호 |
25권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Solid-Electrolyte Interphase (SEI)-free Nickel Silicide Nanowires Anchored on Inner Surface of Graphene-based Micro-tubes for Ultrafast Lithium-ion Battery Anode. |
| 초록 |
Replacing graphite anodes with higher-capacity materials (e.g., silicon) with appropriately designed nanostructures leads to significant improvement in performance. However, problems associated with the unstable evolution of a solid-electrolyte interphase (SEI) on the active anode surface still remain, and these become more detrimental with increasing cycling rates. Here, we propose a new approach that prevents the formation of an SEI layer by engineering the electric potential across the electrolyte/anode interface. The NiSiNWs@GrµTs were tested as a proof of concept for the proposed strategy and demonstrated unprecedentedly excellent performance during 2000 cycles at 20C with a high specific capacity (over 700 mAh/g, corresponding to 84% of the initial capacity). Moreover, the NiSiNWs@GrµT anodes showed superior rate capabilities with a capacity retention higher than 88% at 80C (vs. the capacity at 1C). To the best of our knowledge, there is no report demonstrating a capacity higher than ours (~780-800 mAh/g) at a cycling rate higher than 40-80C. Because our approach is based on general electrochemistry, it is applicable to other materials and a variety of electrochemical devices and components. |
| 저자 |
장원준, 김수한, 김진태, 이상일, 신재혁, 박원일
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| 소속 |
한양대 |
| 키워드 |
SEI inhibition |
| E-Mail |
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