DOI: 10.1016/j.scib.2020.01.018
论文题名: Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries
作者: Gu Z.-Y. ; Guo J.-Z. ; Sun Z.-H. ; Zhao X.-X. ; Li W.-H. ; Yang X. ; Liang H.-J. ; Zhao C.-D. ; Wu X.-L.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 9 起始页码: 702
结束页码: 710
语种: 英语
中文关键词: Cathode
; In-situ XRD
; Na3V2(PO4)2F3
; Sodium-ion batteries
; Working voltage
英文关键词: Carbon
; Cathode materials
; Cathodes
; Coatings
; Electric conductivity
; Electrochemical electrodes
; Electrochemical properties
; Growth kinetics
; Metal ions
; Electrochemical studies
; Electronic conductivity
; High rate capability
; Higher energy density
; In-situ XRD
; Na3V2(PO4)2F3
; Storage performance
; Working voltage
; Sodium-ion batteries
英文摘要: One main challenge for phosphate cathodes in sodium-ion batteries (SIBs) is to increase the working voltage and energy density to promote its practicability. Herein, an advanced Na3V2(PO4)2F3@C cathode is prepared successfully for sodium-ion full cells. It is revealed that, carbon coating can not only enhance the electronic conductivity and electrode kinetics of Na3V2(PO4)2F3@C and inhibit the growth of particles (i.e., shorten the Na+-migration path), but also unexpectedly for the first time adjust the dis-/charging plateaux at different voltage ranges to increase the mean voltage (from 3.59 to 3.71 V) and energy density (from 336.0 to 428.5 Wh kg−1) of phosphate cathode material. As a result, when used as cathode for SIBs, the prepared Na3V2(PO4)2F3@C delivers much improved electrochemical properties in terms of larger specifc capacity (115.9 vs. 93.5 mAh g−1), more outstanding high-rate capability (e.g., 87.3 vs. 60.5 mAh g−1 at 10 C), higher energy density, and better cycling performance, compared to pristine Na3V2(PO4)2F3. Reasons for the enhanced electrochemical properties include ionicity enhancement of lattice induced by carbon coating, improved electrode kinetics and electronic conductivity, and high stability of lattice, which is elucidated clearly through the contrastive characterization and electrochemical studies. Moreover, excellent energy-storage performance in sodium-ion full cells further demonstrate the extremely high possibility of Na3V2(PO4)2F3@C cathode for 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/169900
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China; National & Local United Engineering Laboratory for Power Batteries, and Department of Chemistry, Northeast Normal University, Changchun, 130024, China; Center for Advanced Analytical Science, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China
Recommended Citation:
Gu Z.-Y.,Guo J.-Z.,Sun Z.-H.,et al. Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries[J]. Science Bulletin,2020-01-01,65(9)