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Defect‐Concentration‐Mediated T‐Nb~2~O~5~ Anodes for Durable and Fast‐Charging Li‐Ion Batteries by Yongjian Zheng; Zhenguo Yao; Zulipiya Shadike; Meng Lei; Jianjun Liu; Chilin Li is a Engineering article available to read on EtoBox.

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## Abstract Metastable orthorhombic niobium pentoxide (T‐Nb~2~O~5~) is a promising anode to fulfill the requirements for high‐rate Li‐ion batteries (LIBs). Stoichiometric T‐Nb~2~O~5~ is plagued by low electric conductivity and particle pulverization after repeated charge/discharge processes. In this work, oxygen vacancies are implanted into T‐Nb~2~O~5~ particles via acid immersion of Nb~2~O~5~·nH~2~O with the formation of Lewis acid sites. The multiple characterizations and simulations reveal the lengthening of NbO bonds, and the transformation from NbO~7~ pentagonal bipyramids and NbO~6~ tetragonal bipyramids in T‐Nb~2~O~5−~~x~. The enrichment of oxygen vacancies endows T‐Nb~2~O~5−~~x~ with higher electric conductivity, better electrochemical kinetics, larger pseudocapacitive contribution. O‐doped graphitic C~3~N~4~ is creatively proposed as a trace oxygen pump to repair excessive oxygen vacancies, and it also serves as a sacrifice template for Nb~2~O~5−~~x~ growth to construct a porous and monolithic electrode network. Defect‐modulated Nb~2~O~5−~~x~ displays extraordinary cycling stability (164 mAh g^−1^ at 5 C after 1100 cycles), high capacity retention (104 mAh g^−1^) at an ul

Who reads Defect‐Concentration‐Mediated T‐Nb~2~O~5~ Anodes for Durable and Fast‐Charging Li‐Ion Batteries?

Author

Yongjian Zheng; Zhenguo Yao; Zulipiya Shadike; Meng Lei; Jianjun Liu; Chilin Li

Publisher

Wiley

Published

2021

Language

EN

Field

Engineering (Physical Sciences)