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

Zichao Liu; Wujie Dong; Jianbo Wang; Chenlong Dong; Yue Lin; I-Wei Chen; Fuqiang Huang

iScience (Jan 2020)

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

Zichao Liu,
Wujie Dong,
Jianbo Wang,
Chenlong Dong,
Yue Lin,
I-Wei Chen,
Fuqiang Huang

Affiliations

Zichao Liu: State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
Wujie Dong: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Jianbo Wang: State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
Chenlong Dong: State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
Yue Lin: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
I-Wei Chen: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA; Corresponding author
Fuqiang Huang: State 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 author

Journal volume & issue: Vol. 23, no. 1

Abstract

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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

Published in iScience

ISSN: 2589-0042 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Science
Website: http://www.cell.com/iscience/home

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