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학술지 Silicon Nanofibrils on a Flexible Current Collector for Bendable Lithium-Ion Battery Anodes
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저자
최재용, 이동진, 이용민, 이영기, 김광만, 박정기, 조국영
발행일
201303
출처
Advanced Functional Materials, v.23 no.17, pp.2108-2114
ISSN
1616-301X
출판사
John Wiley & Sons
DOI
https://dx.doi.org/10.1002/adfm.201202458
협약과제
12SB1100, 통합형 플랙서블 필름 전지 시스템 개발, 김광만
초록
A high-energy-capacity, flexible lithium-ion battery is fabricated using a new nanofibril-structured silicon anode on a flexible current collector. Silicon is known to be the highest capacity anode material. However, its huge volume changes during the lithium insertion and extraction results in pulverization, which is the cause of the rapid capacity fade that occurs as the charge-discharge cycles progress. Nanostructured silicon can overcome this pulverization problem. A flexible current collector with high electric conductivity is prepared by a RF-magnetron sputtering of a thin copper layer (<1 μm) onto a porous polymeric membrane. This provides not only flexibility of the electrode but also a template for simple fabrication of nanostructured silicon. Cells using the new, flexible current collector and corresponding silicon nanofibril-structured anode exhibit energy capacities over 2000 mAh g-1 during 30 charge-discharge cycles at C/2. In addition, the coulombic efficiency remains over 99% after the third cycle. These results demonstrate the potential of the new anode for use in commercial high-capacity, flexible lithium-ion batteries. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
키워드
anode, flexible current collector, lithium battery, nanofibril, silicon
KSP 제안 키워드
Co. KGaA, Coulombic Efficiency, High-capacity, Lithium battery, Porous polymeric membrane, Silicon anode, Thin copper layer, Volume change, anode materials, capacity fade, charge-discharge