High-energy nanostructured Na3V2(PO4)2O1.6F1.4 cathodes for sodium-ion batteries and a new insight into their redox chemistry

被引：43

作者：

Li, Chao ^{[1
]}

Shen, Ming ^{[1
]}

Hu, Bei ^{[1
]}

Lou, Xiaobing ^{[1
]}

Zhang, Xi ^{[2
]}

Tong, Wei ^{[3
]}

Hu, Bingwen ^{[1
]}

机构：

[1] East China Normal Univ, Sch Phys & Mat Sci, Shanghai Key Lab Resonance, Inst Funct Mat,State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Organ Chem, Shanghai 200032, Peoples R China

[3] Chinese Acad Sci, High Magnet Field Lab, Anhui Key Lab Condensed Matter Phys Extreme Condi, Hefei 230031, Anhui, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 18期

基金：

中国国家自然科学基金;

关键词：

HIGH-PERFORMANCE CATHODE; ELECTROCHEMICAL PERFORMANCE; STRUCTURAL EVOLUTION; ELECTRODE MATERIALS; RATE CAPABILITY; FLUOROPHOSPHATE; GRAPHENE; NMR; NANOPARTICLES; NANOWIRES;

D O I：

10.1039/c8ta00568k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A microwave-assisted solvothermal procedure is employed for the rapid fabrication of nanostructured Na3V2(PO4)(2)O1.6F1.4 with a space group of 14/mmm. This Na3V2(PO4)(2)O1.6F1.4 exhibits a high energy density (518 W h kg(-1)) and impressive power performance (11 127 W kg(-1) while retaining an energy density of 306 W h kg(-1)) in Na-ion coin cells. Furthermore, the redox chemistry of Na3V2(PO4)(2)O1.6F1.4 was investigated by combination of electron paramagnetic resonance and X-ray diffraction techniques. The results substantiate that: (i) both V-3/V4+ and V-4/V5+ couples are active in this Na3V2(PO4)(2)O1.6F1.4, corresponding to a total amount of 2 electrons transferred per formula unit; (ii) the Na extraction/intercalation process is mainly a solid-solution mechanism.

引用

页码：8340 / 8348

页数：9

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