All Organic Sodium‐Ion Batteries with Na4C8H2O61. (20th February 2014)

• Record Type: Journal Article
• Authors: Wang, Shiwen; Wang, Lijiang; Zhu, Zhiqiang; Hu, Zhe; Zhao, Qing; Chen, Jun
• Is Part Of: Angewandte Chemie. Volume 126:Number 23(2014)
• Page Start: 6002
• Page End: 6006
• Publication Date: 2014-02-20
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201400032
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Developing organic compounds with multifunctional groups to be used as electrode materials for rechargeable sodium‐ion batteries is very important. The organic tetrasodium salt of 2, 5‐dihydroxyterephthalic acid (Na₄DHTPA; Na₄C₈H₂O₆), which was prepared through a green one‐pot method, was investigated at potential windows of 1.6–2.8 V as the positive electrode or 0.1–1.8 V as the negative electrode (vs. Na⁺/Na), each delivering compatible and stable capacities of ca. 180 mAh g⁻¹ with excellent cycling. A combination of electrochemical, spectroscopic and computational studies revealed that reversible uptake/removal of two Na⁺ ions is associated with the enolate groups at 1.6–2.8 V (Na₂C₈H₂O₆/Na₄C₈H₂O₆) and the carboxylate groups at 0.1–1.8 V (Na₄C₈H₂O₆/Na₆C₈H₂O₆). The use of Na₄C₈H₂O₆ as the initial active materials for both electrodes provided the first example of all‐organic rocking‐chair SIBs with an average operation voltage of 1.8 V and a practical energy density of about 65 Wh kg⁻¹.</p> </abstract>