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A Na 3 V 2 (PO 4 ) 2 O 1.6 F 1.4 Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte
Author(s) -
Ni Qiao,
Jiang Heng,
Sandstrom Sean,
Bai Ying,
Ren Haixia,
Wu Xianyong,
Guo Qiubo,
Yu Dongxu,
Wu Chuan,
Ji Xiulei
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202003511
Subject(s) - cathode , materials science , electrolyte , aqueous solution , ion , battery (electricity) , electrochemistry , analytical chemistry (journal) , inorganic chemistry , electrode , chemistry , physics , power (physics) , quantum mechanics , chromatography
Aqueous zinc‐ion batteries are receiving increasing attention; however, the development of high‐voltage cathodes is limited by the narrow voltage window of conventional aqueous electrolytes. Herein, it is reported that Na 3 V 2 (PO 4 ) 2 O 1.6 F 1.4 exhibits the excellent performance, optimal to date, among polyanion cathode materials in a novel neutral water‐in‐bisalts electrolyte of 25 m ZnCl 2 + 5 m NH 4 Cl. It delivers a reversible capacity of 155 mAh g −1 at 50 mA g −1 , a high average operating potential of ≈1.46 V, and stable cyclability of 7000 cycles at 2 A g −1 .