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Efficient Sodium Storage in Rolled‐Up Amorphous Si Nanomembranes
Author(s) -
Huang Shaozhuan,
Liu Lixiang,
Zheng Yun,
Wang Ye,
Kong Dezhi,
Zhang Yingmeng,
Shi Yumeng,
Zhang Lin,
Schmidt Oliver. G.,
Yang Hui Ying
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706637
Subject(s) - materials science , anode , amorphous solid , pseudocapacitance , dangling bond , electrochemistry , sodium , ion , nanotechnology , chemical engineering , silicon , electrode , metallurgy , crystallography , chemistry , supercapacitor , physics , quantum mechanics , engineering
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 (≈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.