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Enhanced Ionic Transport and Structural Stability of Nb-Doped O3-NaFe 0.55 Mn 0.45– x Nb x O 2 Cathode Material for Long-Lasting Sodium-Ion Batteries by Zhang, Lei; Yuan, Tao; Soule, Luke; Sun, Hao; Pang, Yuepeng; Yang, Junhe; Zheng, Shiyou is a Engineering article available to read on EtoBox.

What is Enhanced Ionic Transport and Structural Stability of Nb-Doped O3-NaFe 0.55 Mn 0.45– x Nb x O 2 Cathode Material for Long-Lasting Sodium-Ion Batteries about?

Sodium-ion batteries (SIBs) are promising candidates for inexpensive and sustainable energy storage devices for the widespread utilization of intermittent renewable energy because of the natural abundance of sodium raw materials. However, since the ionic radius of Na + is inherently larger than that of Li + , Na-based intercalation materials often suffer from poor stability and slow reaction kinetics. Regarding SIB cathodes, layered transition metals oxides (Na x TMO 2 ) show promising theoretical capacities but low stability. In this work, a series of O3-NaFe 0.55 Mn 0.45-x Nb x O 2 (x = 0, 0.01, 0.02, and 0.03) compounds are synthesized and show superior stability and rate-capability compared with the pure oxide. For instance, the best-performing sample, NaFe 0.55 Mn 0.44 Nb 0.01 O 2 , has a specific capacity of 127 mAh g -1 and 80% capacity retention over 100 cycles at 0.1 C. Ex situ X-ray diffraction (XRD) result shows that the Nb incorporation could suppress TMO 2 slip and reduce the energy barrier of the O3-P3 phases' transition. When coupled with a hard carbon (HC) anode in a full cell, the battery exhibits significant weight and volume energy and power densities. It is beli

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Author

Zhang, Lei; Yuan, Tao; Soule, Luke; Sun, Hao; Pang, Yuepeng; Yang, Junhe; Zheng, Shiyou

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 2574-0962)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)