DOI: 10.1016/j.scib.2020.04.011
论文题名: Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity
作者: Hu Z. ; He Q. ; Liu Z. ; Liu X. ; Qin M. ; Wen B. ; Shi W. ; Zhao Y. ; Li Q. ; Mai L.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 14 起始页码: 1154
结束页码: 1162
语种: 英语
中文关键词: Areal capacity
; Ion and electron transport
; Lithium-ion battery
; Mass loading
; Niobium pentoxide
英文关键词: Density functional theory
; Electron transport properties
; Ions
; Lithium-ion batteries
; Microspheres
; Stability
; Thermooxidation
; X ray powder diffraction
; Carbon modification
; Diffusion controlled
; Electrochemical analysis
; In-situ X-ray diffraction
; Intercalation kinetics
; Reversible capacity
; Structural stabilities
; Theoretical calculations
; Niobium oxide
英文摘要: Niobium pentoxide (Nb2O5) has attracted great attention as an anode for lithium-ion battery, which is attributed to the high-rate and good stability performances. In this work, TT-, T-, M-, and H-Nb2O5 microspheres were synthesized by a facile one-step thermal oxidation method. Ion and electron transport properties of Nb2O5 with different phases were investigated by both electrochemical analyses and density functional theoretical calculations. Without nanostructuring and carbon modification, the tetragonal Nb2O5 (M-Nb2O5) displays preferable rate capability (121 mAh g−1 at 5 A g−1), enhanced reversible capacity (163 mAh g−1 at 0.2 A g−1) and better cycling stability (82.3% capacity retention after 1000 cycles) when compared with TT-, T-, and H-Nb2O5. Electrochemical analyses further reveal the diffusion-controlled Li+ intercalation kinetics and in-situ X-ray diffraction analysis indicates superior structural stability upon Li+ intercalation/deintercalation. Benefiting from the intrinsic fast ion/electron transport, a high areal capacity of 2.24 mAh cm−2 is obtained even at an ultrahigh mass loading of 22.51 mg cm−2. This work can promote the development of Nb2O5 materials for high areal capacity and stable lithium storage towards practical applications. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169917
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China; State Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
Recommended Citation:
Hu Z.,He Q.,Liu Z.,et al. Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity[J]. Science Bulletin,2020-01-01,65(14)