Uniform and continuous carbon coated sodium vanadium phosphate cathode materials for sodium-ion battery

被引：83

作者：

Si, Lulu ^{[1
]}

Yuan, Zhengqiu ^{[1
]}

Hu, Lei ^{[1
]}

Zhu, Yongchun ^{[1
,2
]}

Qian, Yitai ^{[1
,2
,3
]}

机构：

[1] Univ Sci & Technol China, Dept Chem, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci, Microscale, Hefei 230026, Anhui, Peoples R China

[3] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2014年 / 272卷

关键词：

Sodium vanadium phosphate; Carbon-coated; Continuous carbon; Cathode; Sodium-ion battery; INSERTION CATHODE; ELECTRODE; NA3V2(PO4)(3); PERFORMANCE; NA; CHALLENGES; STORAGE; LI;

D O I：

10.1016/j.jpowsour.2014.09.046

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：

Sodium vanadium phosphate Na3V2(PO4)(3) coated with uniform and continuous carbon film is synthesized by heat treatment of the precursors under C2H2-pyrolysis reducing atmosphere, in which Na3V2(PO4)(3) is formed synchronously with carbon coating. As a cathode material for Na-ion batteries, Na3V2(PO4)(3)/C shows a flat charge plateau at about 3.39 V in the potential window of 2.5-4.0 V versus Na+/Na. The charge capacity of 83.7 mAh g(-1) and discharge capacity of 821 mAh g(-1) can be obtained at a current rate of 1C after 300 cycles and the coulombic efficiency averages 98% throughout. The enhanced electrochemical performance can be contributed to the uniform and continuous carbon layer, which greatly improves the electric conductivity of Na3V2(PO4)(3). (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：880 / 885

页数：6

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