Pyrophosphate Na2FeP2O7 as a low-cost and high-performance positive electrode material for sodium secondary batteries utilizing an inorganic ionic liquid

被引：73

作者：

Chen, Chih-Yao ^{[1
]}

Matsumoto, Kazuhiko ^{[1
]}

Nohira, Toshiyuki ^{[1
]}

Hagiwara, Rika ^{[1
]}

Orikasa, Yuki ^{[2
]}

Uchimoto, Yoshiharu ^{[2
]}

机构：

[1] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Kyoto 6068501, Japan

[2] Kyoto Univ, Grad Sch Human & Environm Studies, Sakyo Ku, Kyoto 6068501, Japan

来源：

JOURNAL OF POWER SOURCES | 2014年 / 246卷

基金：

日本科学技术振兴机构;

关键词：

Sodium secondary battery; Na2FeP2O7; Positive electrode; Ionic liquid; Bis(fluorosulfonyl)amide; X-RAY-ABSORPTION; LOW-MELTING TEMPERATURES; ALKALI BIS(FLUOROSULFONYL)AMIDES; RECHARGEABLE BATTERIES; CATHODE MATERIALS; NAFSA-KFSA; IRON PYROPHOSPHATE; BINARY-MIXTURES; LITHIUM; LI2FESIO4;

D O I：

10.1016/j.jpowsour.2013.08.027

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：

The electrochemical performance of a Na2FeP2O7 positive electrode has been evaluated in an inorganic ionic liquid NaFSA-KFSA (FSA = bis(fluorosulfonyl)amide) at 363 K. The electrode delivers a reversible capacity of 91 mAh g(-1) with excellent rate capability (59 mAh g(-1) at 2000 mA g(-1)) and a capacity retention of 91% over 1000 cycles, which facilitates the development of low-cost and high-safety sodium secondary batteries for large-scale energy storage applications. The average oxidation state of iron increases upon sodium extraction, as evidenced by the edge shift of an X-ray absorption spectroscopy analysis. According to an extended X-ray absorption fine structure analysis, the sodium extraction is accompanied by a shortening of Fe-O bonds. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：783 / 787

页数：5

共 46 条

[1] Nanostructured materials for advanced energy conversion and storage devices [J].