A Low‐Cost and Environmentally Friendly Mixed Polyanionic Cathode for Sodium‐Ion Storage. (14th November 2019)

• Record Type: Journal Article
• Authors: Song, Tianyi; Yao, Wenjiao; Kiadkhunthod, Pinit; Zheng, Yongping; Wu, Nanzhong; Zhou, Xiaolong; Tunmee, Sarayut; Sattayaporn, Suchinda; Tang, Yongbing
• Is Part Of: Angewandte Chemie. Volume 132:Number 2(2020)
• Page Start: 750
• Page End: 755
• Publication Date: 2019-11-14
• Subjects: Eisen -- Nachhaltige Chemie -- Natrium-Ionen-Batterien -- Polyanionische Kathoden; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201912272
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Sodium‐ion batteries (NIBs) are the most promising alternatives to lithium‐ion batteries in the development of renewable energy sources. The advancement of NIBs depends on the exploration of new electrode materials and fundamental understanding of working mechanisms. Herein, via experimental and simulation methods, we develop a mixed polyanionic compound, Na2 Fe(C2 O4 )SO4 ⋅H2 O, as a cathode for NIBs. Thanks to its rigid three dimensional framework and the combined inductive effects from oxalate and sulfate, it delivered reversible Na insertion/desertion at average discharging voltages of 3.5 and 3.1 V for 500 cycles with Coulombic efficiencies of ca. 99 %. In situ synchrotron X‐ray measurements and DFT calculations demonstrate the Fe 2+ /Fe 3+ redox reactions contribute to electron compensation during Na + desertion/insertion. The study suggests mixed polyanionic frameworks may provide promising materials for Na ion storage with the merits of low cost and environmental friendliness. Abstract : Kombiniere, kombiniere : Eine kombinierte Oxalat‐ und Sulfat‐Kathode wurde hergestellt. Die optimierte Natrium‐Ionen‐Batterie erreicht eine reversible Na‐Ionenspeicherung über 500 Zyklen mit hoher Coulomb‐Effizienz von ungefähr 99 %, was darauf hindeutet, dass die gemischten polyanionischen Gerüstverbindungen vielversprechende, kostengünstige und umweltfreundliche Materialien für die Na‐Ionenspeicherung darstellen.