| 학회 |
한국화학공학회 |
| 학술대회 |
2019년 봄 (04/24 ~ 04/26, 제주국제컨벤션센터) |
| 권호 |
25권 1호, p.726 |
| 발표분야 |
재료(Materials) |
| 제목 |
Rapid Synthesis of Silicon Oxycarbide (SiOC) Coating on Bismuth Nanoparticles in a Supercritical Fluid for Superior Lithium Storage |
| 초록 |
Bismuth alloy is a highly promising anode material for LiBs because of its small volume expansion (~250%) and high volumetric capacity (3430 mAh cm-3). However, fast capacity fading due to the volume expansion and electrical conductivity loss limits its wide utilization. Herein, we introduced a new technique to suppress the volume growth of Bi by a one-pot supercritical fluid route using silicone oil as a coating source. Supercritical Bi/SiOC composites (SC-Bi/SiOC) are simply synthesized by preparing a homogenous mixture of silicone oil and Bi(OH)3 in supercritical acetone prior to a two-step pyrolysis process; cross-linking at 120 °C followed by annealing at 500 °C to form a SiOC matrix with higher stability. SC-Bi/SiOC exhibited an initial lithiation capacity of 683 mAh g-1 and a reversible capacity above 300 mAh g-1 at 50 mA g-1. The electrochemical performances of SC-Bi/SiOC revealed the excellent combination of carbon and SiOC coating to prevent the volume changes of Bi while providing a well-defined electronic conductive network and excellent cyclic stability, which can be a new pathway for designing high-performance Bi alloy-based anode materials. |
| 저자 |
아니스1, Winda Devina2, 김재훈2
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| 소속 |
1성균관대, 2Sungkyunkwan Univ. |
| 키워드 |
재료 |
| E-Mail |
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| VOD |
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| 원문파일 |
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