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나노 구조 물리 연구단
나노구조물리 연구단
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Observation of Electrochemically Driven Elemental Segregation in a Si Alloy Thin-Film Anode and its Effects on Cyclic Stability for Li-Ion Batteries

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Title
Observation of Electrochemically Driven Elemental Segregation in a Si Alloy Thin-Film Anode and its Effects on Cyclic Stability for Li-Ion Batteries
Author(s)
Oh, M; Na, S; Woo, CS; Jeong, JH; Kim, SS; Alicja Bachmatiuk; Mark Hermann Rummeli; Hyun, S; Lee, HJ
Publication Date
2015-11
Journal
ADVANCED ENERGY MATERIALS, v.5, no.22, pp.1501136 -
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The results of employing (Ti, Fe)-alloyed Si thin-film anode for Li-ion batteries are reported. The material demonstrates an impressive cyclic stability with stable operation for more than 500 cycles at a capacity higher than 1400 mAh g(-1). Materials characterization using scanning electron microscopy and transmission electron microscopy illuminates an intriguing materials process behind the performance: ripple-like pattern formation via electrochemically driven segregation of the inactive elements (Ti and Fe). The ripple structure plays a buffer role by suppressing loss of the active material upon further cycling, allowing the anode to gradually transform into an array of microbumps. The morphological evolution helps the anode endure long cycles (even up to 1000 cycles) without catastrophic failure as the bumps shrank slowly and steadily, consistent with the electrochemical data. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/2275
ISSN
1614-6832
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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