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Formation of a Surficial Bifunctional Nanolayer on Nb 2 O 5 for Ultrastable Electrodes for Lithium-Ion Battery
Safe and long cycle life electrode materials for lithium-ion batteries are significantly important to meet the increasing demands of rechargeable batteries. Niobium pentoxide (Nb O ) is one of the highly promising candidates for stable electrodes due to its safety and minimal volume expansion. Never...
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Published in: | Small (Weinheim an der Bergstrasse, Germany) Germany), 2017-05, Vol.13 (19) |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Safe and long cycle life electrode materials for lithium-ion batteries are significantly important to meet the increasing demands of rechargeable batteries. Niobium pentoxide (Nb
O
) is one of the highly promising candidates for stable electrodes due to its safety and minimal volume expansion. Nevertheless, pulverization and low conductivity of Nb
O
have remained as inherent challenges for its practical use as viable electrodes. A highly facile method is proposed to improve the overall cycle retention of Nb
O
microparticles by ammonia (NH
) gas-driven nitridation. After nitridation, an ultrathin surficial layer (2 nm) is formed on the Nb
O
, acting as a bifunctional nanolayer that allows facile lithium (Li)-ion transport (10-100 times higher Li diffusivity compared with pristine Nb
O
microparticles) and further prevents the pulverization of Nb
O
. With the subsequent decoration of silver (Ag) nanoparticles (NPs), the low electric conductivity of nitridated Nb
O
is also significantly improved. Cycle retention is greatly improved for nitridated Nb
O
(96.7%) compared with Nb
O
(64.7%) for 500 cycles. Ag-decorated, nitridated Nb
O
microparticles and nitridated Nb
O
microparticles exhibit ultrastable cycling for 3000 cycles at high current density (3000 mA g
), which highlights the importance of the surficial nanolayer in improving overall electrochemical performances, in addition to conductive NPs. |
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ISSN: | 1613-6810 1613-6829 |
DOI: | 10.1002/smll.201603610 |