Cobalt nano-particles embedded carbon fibers for high efficiency lithium-oxygen batteries = 코발트가 담지된 탄소 나노 섬유를 이용한 고성능 리튬-공기 이차 전지 개발

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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.
Advisors
Park, Jung-Kiresearcher박정기researcher
Description
한국과학기술원 :생명화학공학과,
Publisher
한국과학기술원
Issue Date
2015
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2015.2 ,[vi, 51 p. :]

Keywords

$Li-O_2$ batteries; Cobalt nanoparticles; Carbon nanofiber; Lithium peroxide; Charging overpotential; Amorphous $Li_2O_2$; 리튬-공기 전지; 코발트 나노 입자; 탄소 나노 섬유; 리튬 과산화물; 충전 과전압; 비결정성 리튬 과산화물

URI
http://hdl.handle.net/10203/221497
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=657565&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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