Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries

Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries

Summary: Li4Ti5O12 anode can operate at extraordinarily high rates and for a very long time, but it suffers from a relatively low capacity. This has motivated much research on Nb2O5 as an alternative. In this work, we present a scalable chemical processing strategy that maintains the size and morpho...

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Main Authors: Zichao Liu, Wujie Dong, Jianbo Wang, Chenlong Dong, Yue Lin, I-Wei Chen, Fuqiang Huang
Format: Article
Language:English
Published: Elsevier 2020-01-01
Series:iScience
Online Access:http://www.sciencedirect.com/science/article/pii/S2589004219305127
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spelling doaj-931642af3ffa4043b1fb0c48dfe327ef2020-11-25T02:37:28ZengElsevieriScience2589-00422020-01-01231Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion BatteriesZichao Liu0Wujie Dong1Jianbo Wang2Chenlong Dong3Yue Lin4I-Wei Chen5Fuqiang Huang6State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaHefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. ChinaDepartment of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA; Corresponding authorState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China; Corresponding authorSummary: Li4Ti5O12 anode can operate at extraordinarily high rates and for a very long time, but it suffers from a relatively low capacity. This has motivated much research on Nb2O5 as an alternative. In this work, we present a scalable chemical processing strategy that maintains the size and morphology of nano-crystal precursor but systematically reconstitutes the unit cell composition, to build defect-rich porous orthorhombic Nb2O5-x with a high-rate capacity many times those of commercial anodes. The procedure includes etching, proton ion exchange, calcination, and reduction, and the resulting Nb2O5-x has a capacity of 253 mA h g−1 at 0.5C, 187 mA h g−1 at 25C, and 130 mA h g−1 at 100C, with 93.3% of the 25C capacity remaining after cycling for 4,000 times. These values are much higher than those reported for Nb2O5 and Li4Ti5O12, thanks to more available surface/sub-surface reaction sites and significantly improved fast ion and electron conductivity. : Energy Storage; Chemical Synthesis; Energy Materials Subject Areas: Energy Storage, Chemical Synthesis, Energy Materialshttp://www.sciencedirect.com/science/article/pii/S2589004219305127
collection DOAJ
language English
format Article
sources DOAJ
author Zichao Liu
Wujie Dong
Jianbo Wang
Chenlong Dong
Yue Lin
I-Wei Chen
Fuqiang Huang
spellingShingle Zichao Liu
Wujie Dong
Jianbo Wang
Chenlong Dong
Yue Lin
I-Wei Chen
Fuqiang Huang
Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
iScience
author_facet Zichao Liu
Wujie Dong
Jianbo Wang
Chenlong Dong
Yue Lin
I-Wei Chen
Fuqiang Huang
author_sort Zichao Liu
title Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
title_short Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
title_full Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
title_fullStr Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
title_full_unstemmed Orthorhombic Nb2O5-x for Durable High-Rate Anode of Li-Ion Batteries
title_sort orthorhombic nb2o5-x for durable high-rate anode of li-ion batteries
publisher Elsevier
series iScience
issn 2589-0042
publishDate 2020-01-01
description Summary: Li4Ti5O12 anode can operate at extraordinarily high rates and for a very long time, but it suffers from a relatively low capacity. This has motivated much research on Nb2O5 as an alternative. In this work, we present a scalable chemical processing strategy that maintains the size and morphology of nano-crystal precursor but systematically reconstitutes the unit cell composition, to build defect-rich porous orthorhombic Nb2O5-x with a high-rate capacity many times those of commercial anodes. The procedure includes etching, proton ion exchange, calcination, and reduction, and the resulting Nb2O5-x has a capacity of 253 mA h g−1 at 0.5C, 187 mA h g−1 at 25C, and 130 mA h g−1 at 100C, with 93.3% of the 25C capacity remaining after cycling for 4,000 times. These values are much higher than those reported for Nb2O5 and Li4Ti5O12, thanks to more available surface/sub-surface reaction sites and significantly improved fast ion and electron conductivity. : Energy Storage; Chemical Synthesis; Energy Materials Subject Areas: Energy Storage, Chemical Synthesis, Energy Materials
url http://www.sciencedirect.com/science/article/pii/S2589004219305127
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