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학술지 Two-Dimensional Mesoporous Cobalt Sulfide Nanosheets as a Superior Anode for a Li-Ion Battery and a Bifunctional Electrocatalyst for the Li-O2 System
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저자
Palanichamy Sennu, Maria Christy, Vanchiappan Aravindan, 이영기, 남기석, 이윤성
발행일
201508
출처
Chemistry of Materials, v.27 no.16, pp.5726-5735
ISSN
0897-4756
출판사
American Chemical Society (ACS)
DOI
https://dx.doi.org/10.1021/acs.chemmater.5b02364
협약과제
14PB4300, 중대형 전고체 리튬이차전지용 유무기 하이브리드 고체전해질, 이영기
초록
We report the synthesis of two-dimensional (2D) Co3S4 in a nanothickness sheetlike morphology via simple hydrothermal process and its application to electrochemical energy-storage devices. The presence of unique mesopores with a combination of core/shell nanoparticles in the nanosheets showed superior electrochemical performances as a negative electrode for a Li-ion battery (LIB) and an electrocatalyst in Li-O2 battery applications. A high discharge capacity of ~968 mAh g-1 is noted after 60 cycles with excellent cycling stability when evaluated as an anode for a LIB. On the other hand, the first discharge capacity of ~5917 mAh g-1 is observed with a high reversibility of 95.72% for the Li-O2 battery point of view. This exceptional electrochemical performance in both applications is mainly attributed to the presence of mesoporous with core/shell 2D nanostructure, which translates more catalytic bifunctional (oxygen reduction reaction/oxygen evolution reaction) active sites for Li-O2 and sustains the volume variations that occur in a three-dimensional manner upon the charge-discharge process for LIB applications. Ex situ studies, such as transmission electron microscopy, X-ray photoelectron spectroscopy, and impedance spectroscopy studies, are also conducted to validate the reaction mechanisms. (Figure Presented).
KSP 제안 키워드
2D nanostructure, Active sites, Charge-discharge process, Cobalt sulfide, Electrochemical energy, Electrochemical performance, Ex-situ, Excellent cycling stability, High discharge capacity, Impedance spectroscopy(IS), Ion batteries