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Formation of a Surficial Bifunctional Nanolayer on Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery.
Small 2017; 13(19)S

Abstract

Safe and long cycle life electrode materials for lithium-ion batteries are significantly important to meet the increasing demands of rechargeable batteries. Niobium pentoxide (Nb2 O5) is one of the highly promising candidates for stable electrodes due to its safety and minimal volume expansion. Nevertheless, pulverization and low conductivity of Nb2 O5 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 Nb2 O5 microparticles by ammonia (NH3) gas-driven nitridation. After nitridation, an ultrathin surficial layer (2 nm) is formed on the Nb2 O5 , acting as a bifunctional nanolayer that allows facile lithium (Li)-ion transport (10-100 times higher Li diffusivity compared with pristine Nb2 O5 microparticles) and further prevents the pulverization of Nb2 O5 . With the subsequent decoration of silver (Ag) nanoparticles (NPs), the low electric conductivity of nitridated Nb2 O5 is also significantly improved. Cycle retention is greatly improved for nitridated Nb2 O5 (96.7%) compared with Nb2 O5 (64.7%) for 500 cycles. Ag-decorated, nitridated Nb2 O5 microparticles and nitridated Nb2 O5 microparticles exhibit ultrastable cycling for 3000 cycles at high current density (3000 mA g-1), which highlights the importance of the surficial nanolayer in improving overall electrochemical performances, in addition to conductive NPs.

Authors+Show Affiliations

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-Ro, Yuseong-Gu, Daejeon, 305-701, Republic of Korea.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28322499

Citation

Cheong, Jun Young, et al. "Formation of a Surficial Bifunctional Nanolayer On Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery." Small (Weinheim an Der Bergstrasse, Germany), vol. 13, no. 19, 2017.
Cheong JY, Kim C, Jung JW, et al. Formation of a Surficial Bifunctional Nanolayer on Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery. Small. 2017;13(19).
Cheong, J. Y., Kim, C., Jung, J. W., Yoon, K. R., Cho, S. H., Youn, D. Y., ... Kim, I. D. (2017). Formation of a Surficial Bifunctional Nanolayer on Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery. Small (Weinheim an Der Bergstrasse, Germany), 13(19), doi:10.1002/smll.201603610.
Cheong JY, et al. Formation of a Surficial Bifunctional Nanolayer On Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery. Small. 2017;13(19) PubMed PMID: 28322499.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Formation of a Surficial Bifunctional Nanolayer on Nb2 O5 for Ultrastable Electrodes for Lithium-Ion Battery. AU - Cheong,Jun Young, AU - Kim,Chanhoon, AU - Jung,Ji-Won, AU - Yoon,Ki Ro, AU - Cho,Su-Ho, AU - Youn,Doo-Young, AU - Jang,Hye-Yeon, AU - Kim,Il-Doo, Y1 - 2017/03/21/ PY - 2016/10/27/received PY - 2017/01/31/revised PY - 2017/3/23/pubmed PY - 2017/3/23/medline PY - 2017/3/22/entrez KW - Nb2O5 KW - electrodes KW - lithium KW - nitridation KW - surficial bifunctional nanolayers JF - Small (Weinheim an der Bergstrasse, Germany) JO - Small VL - 13 IS - 19 N2 - Safe and long cycle life electrode materials for lithium-ion batteries are significantly important to meet the increasing demands of rechargeable batteries. Niobium pentoxide (Nb2 O5) is one of the highly promising candidates for stable electrodes due to its safety and minimal volume expansion. Nevertheless, pulverization and low conductivity of Nb2 O5 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 Nb2 O5 microparticles by ammonia (NH3) gas-driven nitridation. After nitridation, an ultrathin surficial layer (2 nm) is formed on the Nb2 O5 , acting as a bifunctional nanolayer that allows facile lithium (Li)-ion transport (10-100 times higher Li diffusivity compared with pristine Nb2 O5 microparticles) and further prevents the pulverization of Nb2 O5 . With the subsequent decoration of silver (Ag) nanoparticles (NPs), the low electric conductivity of nitridated Nb2 O5 is also significantly improved. Cycle retention is greatly improved for nitridated Nb2 O5 (96.7%) compared with Nb2 O5 (64.7%) for 500 cycles. Ag-decorated, nitridated Nb2 O5 microparticles and nitridated Nb2 O5 microparticles exhibit ultrastable cycling for 3000 cycles at high current density (3000 mA g-1), which highlights the importance of the surficial nanolayer in improving overall electrochemical performances, in addition to conductive NPs. SN - 1613-6829 UR - https://www.unboundmedicine.com/medline/citation/28322499/Formation_of_a_Surficial_Bifunctional_Nanolayer_on_Nb2_O5_for_Ultrastable_Electrodes_for_Lithium_Ion_Battery_ L2 - https://doi.org/10.1002/smll.201603610 DB - PRIME DP - Unbound Medicine ER -