期刊
ADVANCED MATERIALS
卷 30, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706637
关键词
alloying-type anode materials; amorphous Si nanomembranes; dangling bonds; pseudocapacitance contributions; sodium-ion batteries; sodium storage mechanisms
类别
资金
- National Research Foundation, Prime Minister's Office, Singapore under NRF-ANR [NRF2015-NRF-ANR000-CEENEMA]
- Department of Education of Guangdong Province [2016KZDXM008]
Alloying-type materials are promising anodes for high-performance sodium-ion batteries (SIBs) because of their high capacities and low Na-ion insertion potentials. However, the typical candidates, such as P, Sn, Sb, and Pb, suffer from severe volume changes (approximate to 293-487%) during the electrochemical reactions, leading to inferior cycling performances. Here, a high-rate and ultrastable alloying-type anode based on the rolled-up amorphous Si nanomembranes is demonstrated. The rolled-up amorphous Si nanomembranes show a very small volume change during the sodiation/desodiation processes and deliver an excellent rate capability and ultralong cycle life up to 2000 cycles with 85% capacity retention. The structural evolution and pseudocapacitance contribution are investigated by using the ex situ characterization techniques combined with kinetics analysis. Furthermore, the mechanism of efficient sodium-ion storage in amorphous Si is kinetically analyzed through an illustrative atomic structure with dangling bonds, offering a new perspective on understanding the sodium storage behavior. These results suggest that nanostructured amorphous Si is a promising anode material for high-performance SIBs.
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