气候变化领域集成服务门户(CCPortal): Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries

CCPortal

DOI	10.1016/j.scib.2020.01.018
	Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries
	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.
发表日期	2020
ISSN	20959273
起始页码	702
结束页码	710
卷号	65 期号:9
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207044
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
推荐引用方式 GB/T 7714	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],2020,65(9).
APA	Gu Z.-Y..,Guo J.-Z..,Sun Z.-H..,Zhao X.-X..,Li W.-H..,...&Wu X.-L..(2020).Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries.Science Bulletin,65(9).
MLA	Gu Z.-Y.,et al."Carbon-coating-increased working voltage and energy density towards an advanced Na3V2(PO4)2F3@C cathode in sodium-ion batteries".Science Bulletin 65.9(2020).