南方科技大学知识苑(SUSTech KC): Improvement in electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries by K-Ca co-doping

题名	Improvement in electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries by K-Ca co-doping
作者	Zhu, Qing 1,2; Cheng, Hua2 ; Zhang, Xinmei 1; He, Liqing 2; Hu, Lizhen 1; Yang, Jianwen 1; Chen, Quanqi 1; Lu, Zhouguang2
通讯作者	Chen, Quanqi; Lu, Zhouguang
发表日期	2018-08-10
DOI	10.1016/j.electacta.2018.05.174
发表期刊	ELECTROCHIMICA ACTA 影响因子和分区
ISSN	0013-4686
EISSN	1873-3859
卷号	281页码:208-217
摘要	It is still a great challenge to improve the diffusion dynamics of Na thorn throughout the Na3V2(PO4)(3), one of the most promising cathodes for sodium ion batteries. In this work, we present a facile doping strategy to tackle this problem by co-doping the Na+ with K+ and Ca2+. Na3-3xKxCaxV2(PO4)(3)/C (x = 0, 0.05, 0.07 and 0.09) composites are prepared by a sol-gel method combined with freeze-drying and high-temperature calcination processes, and the composites are characterized by XRD, XPS, SEM, TEM and electrochemical measurements. The results indicate that co-substitution of K+ and Ca2+ for Na in Na3V2(PO4)(3) enlarges the cell volume of Na3V2(PO4)(3) and is beneficial for improving electrochemical performance. All co-doped Na3V2(PO4)(3)/C composites have better electrochemical performance than the pristine Na3V2(PO4)(3)/C composite. The optimal doping compositions are found to be Na2.79K0.07Ca0.07V2(PO4)(3)/C, displaying reversible capacities of 110.2, 92.7 and 83.6 mAh.g(-1) at the current densities of 0.1, 1, and 10C (1180 mA.g(-1)), respectively, in the voltage range of 2.5-4.0 V. The Na2.79K0.07Ca0.07V2(PO4)(3)/C exhibits capacity retentions of 91% at 1C after 50 cycles and 83% at 10C after 150 cycles, while Na3V2(PO4)(3)/C composite displays capacity retentions of 88.5% at 1C after 50 cycles and 26.5% at 10C after 150 cycles, respectively. The improved electrochemical performance of co-doped Na3V2(PO4)(3)/C is ascribed to enhanced Na thorn diffusion after the co-substitution of K+ and Ca2+ for Na in Na3V2(PO4)(3)/C. (c) 2018 Elsevier Ltd. All rights reserved.
关键词	Sodium-ion battery Sodium vanadium phosphate Sol-gel Co-substitution Cathode
相关链接	[来源记录]
收录类别	SCI ; EI
语种	英语
学校署名	通讯
资助项目	Natural Science Foundation of Shenzhen[JCYJ20170412153139454] ; Natural Science Foundation of Shenzhen[JCYJ20150630145302231] ; Natural Science Foundation of Shenzhen[JCYJ20150331101823677]
WOS研究方向	Electrochemistry
WOS类目	Electrochemistry
WOS记录号	WOS:000439134600023
出版者	PERGAMON-ELSEVIER SCIENCE LTD
EI入藏号	20182505335665
EI主题词	Binary alloys ; Cathodes ; Metal ions ; Sodium compounds ; Sol-gel process ; Sol-gels ; Vanadium compounds
EI分类号	Metallurgy:531.1 ; Chemical Products Generally:804 ; Glass:812.3
ESI学科分类	CHEMISTRY
来源库	Web of Science
引用统计	被引频次[WOS]：88
成果类型	期刊论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/27381
专题	工学院_材料科学与工程系
作者单位	1.Guilin Univ Technol, Coll Chem & Bioengn, Guangxi Key Lab Electrochem & Magnetochem Funct M, Guilin 541004, Peoples R China 2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
第一作者单位	材料科学与工程系
通讯作者单位	材料科学与工程系
推荐引用方式 GB/T 7714	Zhu, Qing,Cheng, Hua,Zhang, Xinmei,et al. Improvement in electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries by K-Ca co-doping[J]. ELECTROCHIMICA ACTA,2018,281:208-217.
APA	Zhu, Qing.,Cheng, Hua.,Zhang, Xinmei.,He, Liqing.,Hu, Lizhen.,...&Lu, Zhouguang.(2018).Improvement in electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries by K-Ca co-doping.ELECTROCHIMICA ACTA,281,208-217.
MLA	Zhu, Qing,et al."Improvement in electrochemical performance of Na3V2(PO4)(3)/C cathode material for sodium-ion batteries by K-Ca co-doping".ELECTROCHIMICA ACTA 281(2018):208-217.