리튬이차전지용 Si-Ti-Fe 합금 음극소재의 미세구조 분석

• Published in: 대한금속·재료학회지, 51(6) Vol. 51; no. 6; pp. 429 - 436
• Main Authors: 채정은, Jeong Eun Chae, 양준모, Jun Mo Yang, 박경진, Kyung Jin Park, 유정호, Jung Ho Yoo, 박윤창, Yun Chang Park, 성민석, Min Suk Sung, 유현종, Hyun Jong Yu, 김성수, Sung Soo Kim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 20.06.2013; 대한금속·재료학회
• Subjects: Li-ion battery; microstructure; Si-Ti-Fe alloy anode; solidification TEM; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2013.51.6.429

For improving anode materials in Li-ion batteries, the Si system has been noted by many researchers because it has higher energy density and capacity than the graphite anode material used currently. However, the life cycle of the Si anode tends to decrease due to the remarkable volume expansion which is caused by insertion of Li ions when the cell is charged. In this study, we controlled the size of active Si particles, which are dispersed in the inactive matrix, down to several tens of nm as active materials by adding heterogeneous elements. To understand the reaction mechanism of active Si dispersed in the inactive matrix, we analyzed the microstructure of the Si-Ti-Fe alloy using high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. The volume expansion behavior was improved by employing the TiFeSi2 matrix and refining the active Si particle size, and life performance of the Li-ion batteries was enhanced. (Received September 28, 2012).