Bateria flexivel

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Letter pubs.acs.org/NanoLett

Bendable Inorganic Thin-Film Battery for Fully Flexible Electronic Systems
Min Koo,† Kwi-Il Park,† Seung Hyun Lee,† Minwon Suh,† Duk Young Jeon,† Jang Wook Choi,‡ Kisuk Kang,§ and Keon Jae Lee*,†


Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic ofKorea ‡ Graduate School of EEWS (WCU), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea § Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
S * Supporting Information

ABSTRACT: High-performance flexible power sources have gained attention, asthey enable the realization of next-generation bendable, implantable, and wearable electronic systems. Although the rechargeable lithium-ion battery (LIB) has been regarded as a strong candidate for a high-performance flexible energy source, compliant electrodes for bendable LIBs are restricted to only a few materials, and their performance has not been sufficient for them to be applied to flexibleconsumer electronics including rollable displays. In this paper, we present a flexible thin-film LIB developed using the universal transfer approach, which enables the realization of diverse flexible LIBs regardless of electrode chemistry. Moreover, it can form high-temperature (HT) annealed electrodes on polymer substrates for high-performance LIBs. The bendable LIB is then integrated with a flexiblelight-emitting diode (LED), which makes an all-in-one flexible electronic system. The outstanding battery performance is explored and well supported by finite element analysis (FEA) simulation. KEYWORDS: Bendable thin-film battery, all-solid-state, rechargeable LIB, flexible electronic system he advent of a fully flexible electronic system will be a great leap in technology, as it will open the door tothe next-generation electronic environment based on bendable, implantable, and wearable devices. These next-generation electronic devices are marked by unprecedented advantages of excellent portability, lightweight, and conformal contact on curvilinear surfaces.1,2 Although the remarkable development of mechanically flexible electronic devices has been widely reported, their feasibility has beenrestricted in unit components, such as light-emitting diodes (LEDs),3,4 sensing electrodes,5,6 circuit elements,7−9 and radio frequency identification (RFID) antennas.10 Toward all-in-one flexible systems, the development of a bendable high-power source that can be applied to consumer electronics has been an obstacle to overcome. Rechargeable lithium ion batteries (LIBs) have shown great promise asflexible power sources due to their high operating

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voltage, high energy capacity, and long-term cyclability.2,11 In recent years, compliant materials on curvilinear surfaces, such as carbon nanotubes,12−15 carbon nanofibers,16 graphene,17,18 metal oxide-based nanowires,19 and slurry-typed mixtures of nanostructured active materials,20,21 have been explored as flexible LIB electrodes. Althoughthey have shown advanced performance for flexible LIBs, the combination of these as anode or cathode has only been accessible to a few electrode materials that are synthesizable in certain nanostructures or carbon templates.22 Moreover, the use of liquid-type electrolytes has added more complexities in the realization of a fully flexible LIB, and their thermal stability should be carefullyconsidered.23,24 In addition, the lightweight thin-film shape of
Received: June 15, 2012 Revised: July 27, 2012 Published: July 30, 2012
4810
dx.doi.org/10.1021/nl302254v | Nano Lett. 2012, 12, 4810−4816

© 2012 American Chemical Society

Nano Letters flexible LIBs required for nano/microelectromechanical systems (NEMS/MEMSs) cannot be formed by slurry-type composite materials. In this paper, we...
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