Unlocking the Electrochemistry and the Activation Mechanism in the Iron‐Rich Na0.6Fe1.2PO4 Phase for High‐Performance Sodium‐Ion Storage. Issue 5 (11th February 2022)

• Record Type: Journal Article
• Authors: Liu, Xuelian; Wang, Jiande; Du, Mengyuan; Zhu, Qi; Robeyns, Koen; Zhang, Xiaozhe; Kumar, Varun; Gohy, Jean‐François; Garcia, Yann; Vlad, Alexandru
• Is Part Of: Batteries & supercaps. Volume 5:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-11
• Subjects: cathode material -- cycling activation -- sodium iron phosphate -- sodium-ion batteries; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202100390
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Sodium‐ion batteries are considered as the immediate sustainable alternative to lithium‐ion systems. To reduce the competitiveness gap, improved performances and better understanding of sodium storage, especially of new phases based on sustainable materials, are further required. In this work, we provide advanced investigation of the structure and the electrochemistry of a peculiar off‐stoichiometric iron‐rich phase (Na0.6 Fe1.2 PO4 ) for sodium storage. An interesting electrochemical activation phenomenon is described and contrary to conventional ageing processes it is found to significantly enhance the energy and power rate performances. Abstract : An interesting activation phenomenon : Activation with cycling of a 3.8 V (vs. Na + /Na) redox process in the iron‐rich Na0.6 Fe1.2 PO4 material unlocks new electrochemical mechanism for high‐performance, low‐cost and eco‐friendly Na‐ion cathodes.