DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Park, Jung-Ki | - |
dc.contributor.advisor | 박정기 | - |
dc.contributor.author | Kim, Yun Jung | - |
dc.contributor.author | 김윤정 | - |
dc.date.accessioned | 2017-03-29T02:34:06Z | - |
dc.date.available | 2017-03-29T02:34:06Z | - |
dc.date.issued | 2015 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=657565&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/221497 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2015.2 ,[vi, 51 p. :] | - |
dc.description.abstract | The problem of high charge polarization is one of the most significant challenges in current nonaque-ous lithium-oxygen ($Li-O_2$) batteries. The development of oxygen electrode which reduces oxygen evolution reaction (OER) overpotential is thus essential to remedy this problem. Here, we suggest a binder-free electrode based on Co nanoparticles-embedded carbon nanofibers (Co-CNFs), which simultaneously reduces the charge and discharge polarization and greatly extends cycling stability more than six fold. The Co-CNF low-ers discharge polarization because of an enhanced oxygen reduction reaction (ORR) activity compared to the Co-free CNF. Even though the embedment of Co does not enhance OER catalytic activity, it significantly reduces charge overvoltage by forming easily decomposable discharge product, amorphous $Li_2O_2$. A mecha-nism for the amorphous $Li_2O_2$ formation was suggested in terms of charge delocalization induced by the Co NPs. The findings suggest a novel electrode design strategy of combining inexpensive metal nanoparticles and carbons for modulating the phase structure of discharge products. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Cobalt nanoparticles | - |
dc.subject | Carbon nanofiber | - |
dc.subject | Lithium peroxide | - |
dc.subject | Charging overpotential | - |
dc.subject | Amorphous $Li_2O_2$ | - |
dc.subject | 리튬-공기 전지 | - |
dc.subject | 코발트 나노 입자 | - |
dc.subject | 탄소 나노 섬유 | - |
dc.subject | 리튬 과산화물 | - |
dc.subject | 충전 과전압 | - |
dc.subject | 비결정성 리튬 과산화물 | - |
dc.title | Cobalt nano-particles embedded carbon fibers for high efficiency lithium-oxygen batteries | - |
dc.title.alternative | 코발트가 담지된 탄소 나노 섬유를 이용한 고성능 리튬-공기 이차 전지 개발 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :생명화학공학과, | - |
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