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나노입자 연구단
나노입자 연구단
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Si7Ti4Ni4 as a buffer material for Si and its electrochemical study for lithium ion batteries

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Title
Si7Ti4Ni4 as a buffer material for Si and its electrochemical study for lithium ion batteries
Author(s)
Kyung Jae Lee; Seung-Ho Yu; Jung-Joon Kim; Dae-Hyeok Lee; Jungjin Park; Suh, Soon Sung; Cho, Jong Soo; Yung Eun Sung
Publication Date
2014-01
Journal
JOURNAL OF POWER SOURCES, v.246, no., pp.729 - 735
Publisher
ELSEVIER SCIENCE BV
Abstract
Nano-Si embedded Si7Ti4Ni4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si7Ti4Ni4, the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7Ti4Ni4 has good electrical conductivity, in the order of 105 S m-1, which is more conductive than amorphous carbon that is usually used as a coating material for active material. Furthermore, the surrounding grain boundaries of Si7Ti 4Ni4 effectively relax volume expansion of Si. Therefore, it plays a critical role in maintaining the structure of electrode and the integrity of active materials. As a result, nano-Si embedded in Si 7Ti4Ni4 shows outstanding cycle performance over 50 cycles at 400 mA g-1, and it maintains 86% of its specific capacity at 3200 mA g-1, compared with that of 400 mA g-1. This indicates that nano-Si embedded in Si7Ti4Ni 4 can be a promising anode material for lithium ion batteries. © 2013 Elsevier B.V. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/1164
ISSN
0378-7753
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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