| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Optimized SnO2 electrodes architecture for High-Capacity and Long-Cycle-Life Lithium-Ion Batteries: Ag Nanoparticles coated Mesoporous SnO2/NiO Nanotubes |
| 초록 | Negative electrode materials with high energy and power density are important for the next generation of long-life lithium-ion batteries, especially for electric vehicles (EVs) and energy storage system (ESS). Among several candidates of high-capacity anodes, SnO2 has attracted much interest owing to its abundance, safety, and high theoretical capacity (780 mAh g-1). Nevertheless, some challenges exist for SnO2, such as i) huge volume change (＞300%), ii) low reversible capacity of SnO2 due to the formation of highly stable Li2O, and iii) low electrical conductivity. In order to overcome the drawbacks of SnO2 anodes, several nanostructures (such as nanoparticles, nanofibers, nanoflakes, and nanotubes) and various porous structures have been proposed. However, most of the suggested nano- and porous structures exhibited limited effects on alleviating the huge volume change of SnO2, which could not contribute to the increase in the reversible capacity of SnO2. Here we report that the Ag nanoparticles decorated mesoporous SnO2/NiO nanotube (m-SNT) anodes can provide solutions to important limitations present above in SnO2 anodes. From the SnO2 material design, we synthesized SnO2 nanotubes (NTs) as the 1D porous hollow structure alleviates the severe volume expansion by filling the hollow regions in the process of lithiation. Next, metallic nickel (Ni) nanoparticles converted from the NiO nanograins during the lithiation process reversibly decompose Li2O during delithiation process, which significantly improve the reversible capacity of the m-SNT anodes. In addition, to enhance the electrical conductivity of the m-SNTs, Ag nanoparticles were uniformly coated on the surface of m-SNT to create the Ag nanoparticles decorated m-SNT (m-SNT@Ag), hence contributing to enhance both the rate capability and long-term cyclability. Thus, the m-SNT@Ag anodes exhibit outstanding cycling stability with high reversible capacity and rate capabilities. |
| 저자 | 김찬훈, 정지원, 윤기로, 윤두영, 김일두 |
| 소속 | KAIST |
| 키워드 | SnO2; anodes; NiO; Li-ion batteries |
